mirror of
https://github.com/MobSF/Mobile-Security-Framework-MobSF.git
synced 2026-10-11 22:50:09 +00:00
Ajin Abraham
62563ca429
Security Fixes [GHSA-8j49-mmcx-4mp5] Arbitrary File Read via Path Traversal in ZIP/APK Icon Extraction The android:icon attribute from an APK manifest was interpolated into file paths without validation, allowing a crafted APK to read arbitrary files from the server. Fixed by adding is_path_traversal() and is_safe_path() guards in find_icon_path_zip. Dependency bump included. [GHSA-3p54-567p-2wpr] CSRF Checks Not Enforced After Django Middleware Migration The migration from the deprecated MIDDLEWARE_CLASSES to MIDDLEWARE omitted CsrfViewMiddleware, SecurityMiddleware, and XFrameOptionsMiddleware, leaving CSRF, HSTS, and clickjacking protections silently disabled. All three have been restored to the active MIDDLEWARE tuple. The now-dead MIDDLEWARE_CLASSES block has been removed to prevent future confusion. [GHSA-x768-8642-mmq9] Zip Bomb Denial of Service via Per-File Size Limit Bypass The per-file size check in ZIP extraction logged a warning on oversized members but was missing a continue, allowing files exceeding ZIP_MAX_UNCOMPRESSED_FILE_SIZE to be extracted anyway as long as the aggregate limit was not reached. Fixed by adding the missing continue. [GHSA-95px-34x5-p37h] SSRF Port Restriction Bypass in assetlinks_check valid_host() was called with only the bare hostname, allowing android:port to be appended afterward without going through port validation, bypassing the HTTP/HTTPS-only restriction. Fixed with a two-layer approach: primary port allowlist check before URL assembly in get_browsable_activities, and a defence-in-depth re-check in _check_url. Hardening The hand-rolled safe_extract used os.path.abspath (symlink-blind) instead of os.path.realpath, creating a TOCTOU window where a symlink could redirect extraction outside the destination directory. Replaced with Python 3.12's tarfile.extractall(filter='data') (PEP 706), which rejects symlinks, hardlinks, absolute paths, and traversal members per-member before extraction. A robust realpath-based fallback is included for older Python versions. Both download_app_data call sites in the iOS dynamic analyser now wrap app_container and tarfile with shlex.quote when building the SSH tar command, as defensive coding hygiene. Refactoring is_path_traversal, is_safe_path, clean_filename, cmd_injection_check, is_pipe_or_link, and is_attack_pattern were scattered across utils.py and shared.py. All have been moved to mobsf/MobSF/security.py as the single authoritative location for security primitives. Developer Tooling AGENTS.md / CLAUDE.md - AI agent guidelines Added a coding-standards document for AI coding agents (Cursor, Claude, Codex) covering MobSF-specific secure-by-default patterns: path traversal guards, archive extraction safety, Django middleware active-tuple hygiene, split-validation anti-patterns (SSRF port bypass), guard completeness (continue/return/raise after every security check), and Django-specific security features (form validators, decorators, middleware). CLAUDE.md is a symlink to AGENTS.md.
562 lines
19 KiB
Python
562 lines
19 KiB
Python
# -*- coding: utf_8 -*-
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"""
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Shared Functions.
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Module providing the shared functions for iOS and Android
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"""
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import hashlib
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import logging
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import os
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import platform
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import re
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import shutil
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import subprocess
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import zipfile
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from pathlib import Path
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import arpy
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from django.utils.html import escape
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from django.http import HttpResponseRedirect
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from mobsf.MobSF import settings
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from mobsf.MobSF.security import (
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sanitize_for_logging,
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)
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from mobsf.MobSF.security import (
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is_path_traversal,
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is_safe_path,
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)
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from mobsf.MobSF.utils import (
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EMAIL_REGEX,
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STRINGS_REGEX,
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URL_REGEX,
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append_scan_status,
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is_md5,
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print_n_send_error_response,
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set_permissions,
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)
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from mobsf.MobSF.views.scanning import (
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add_to_recent_scan,
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handle_uploaded_file,
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)
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from mobsf.StaticAnalyzer.views.comparer import (
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generic_compare,
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)
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from mobsf.StaticAnalyzer.views.common.entropy import (
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get_entropies,
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)
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from mobsf.MobSF.views.authentication import (
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login_required,
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)
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from mobsf.MobSF.views.authorization import (
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Permissions,
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permission_required,
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)
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logger = logging.getLogger(__name__)
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RESERVED_FILE_NAMES = [
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'AndroidManifest.xml',
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'resources.arsc',
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'META-INF/MANIFEST.MF',
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'META-INF/CERT.SF',
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'META-INF/CERT.RSA',
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'META-INF/CERT.DSA',
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'classes.dex']
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for i in range(2, 50):
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RESERVED_FILE_NAMES.append(f'classes{i}.dex')
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def hash_gen(checksum, app_path) -> tuple:
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"""Generate and return sha1 and sha256 as a tuple."""
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try:
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msg = 'Generating Hashes'
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logger.info(msg)
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append_scan_status(checksum, msg)
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sha1 = hashlib.sha1()
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sha256 = hashlib.sha256()
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block_size = 65536
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with open(app_path, mode='rb') as afile:
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buf = afile.read(block_size)
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while buf:
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sha1.update(buf)
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sha256.update(buf)
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buf = afile.read(block_size)
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sha1val = sha1.hexdigest()
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sha256val = sha256.hexdigest()
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return sha1val, sha256val
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except Exception as exp:
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msg = 'Failed to generate Hashes'
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logger.exception(msg)
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append_scan_status(checksum, msg, repr(exp))
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def is_reserved_file_conflict(file_path):
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"""Check for reserved file conflict."""
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if any(file_path.startswith(i) and file_path != i for i in RESERVED_FILE_NAMES):
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return True
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return False
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def unzip(checksum, app_path, ext_path):
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"""Unzip APK.
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Unzip a APK archive while handling encrypted files, reserved file conflicts,
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path traversal (Zip Slip), and permission adjustments. Some of the anti-analysis
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techniques used by malware authors and packers are handled here.
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Args:
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checksum (str): The checksum of the file.
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app_path (str): Path to the ZIP archive.
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ext_path (str): Path to extract the files.
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Returns:
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list: A list of files extracted or an empty list if an error occurs.
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"""
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msg = 'Unzipping'
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logger.info(msg)
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append_scan_status(checksum, msg)
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files = []
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original_ext_path = ext_path
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try:
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with zipfile.ZipFile(app_path, 'r') as zipptr:
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files = zipptr.namelist()
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total_size = 0
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stop_fallback_extraction = False
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for fileinfo in zipptr.infolist():
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ext_path = original_ext_path
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# Skip encrypted files
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if fileinfo.flag_bits & 0x1:
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msg = ('Skipping encrypted file '
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f'{sanitize_for_logging(fileinfo.filename)}')
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logger.warning(msg)
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continue
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file_path = fileinfo.filename.rstrip('/\\') # Remove trailing slashes
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# Decode the filename
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if not isinstance(file_path, str):
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file_path = file_path.decode('utf-8', errors='replace')
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# Check for reserved file conflict
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if is_reserved_file_conflict(file_path):
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ext_path = str(Path(ext_path) / '_conflict_')
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# Handle Zip Slip
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if is_path_traversal(file_path):
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msg = ('Zip slip detected. skipped extracting'
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f' {sanitize_for_logging(file_path)}')
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logger.error(msg)
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stop_fallback_extraction = True
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continue
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# Check uncompressed size
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if not fileinfo.is_dir():
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total_size += fileinfo.file_size
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if fileinfo.file_size > settings.ZIP_MAX_UNCOMPRESSED_FILE_SIZE:
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size_mb = fileinfo.file_size / (1024 * 1024)
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msg = (f'File too large ({size_mb:.2f} MB). Skipping '
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f'{sanitize_for_logging(file_path)}')
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logger.warning(msg)
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continue
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if total_size > settings.ZIP_MAX_UNCOMPRESSED_TOTAL_SIZE:
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stop_fallback_extraction = True
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total_size_mb = total_size / (1024 * 1024)
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msg = ('Total uncompressed size '
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f'({total_size_mb:.2f} MB) exceeds limit. '
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'Aborting extraction.')
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logger.error(msg)
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raise Exception(msg)
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# Fix permissions
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if fileinfo.is_dir():
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# Directories should have rwxr-xr-x (755)
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# Skip creating directories
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continue
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else:
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# Files should have rw-r--r-- (644)
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fileinfo.external_attr = (0o100644 << 16) | (
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fileinfo.external_attr & 0xFFFF)
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# Extract the file
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try:
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zipptr.extract(file_path, ext_path)
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except Exception:
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logger.warning(
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'Failed to extract %s', sanitize_for_logging(file_path))
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except Exception as exp:
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msg = f'Unzipping Error - {str(exp)}'
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logger.error(msg)
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append_scan_status(checksum, msg, repr(exp))
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# Do not fallback to OS unzip
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# if the total uncompressed file size is too large
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# or if zip slip is detected
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if stop_fallback_extraction:
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return files
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# Fallback to OS unzip
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ofiles = os_unzip(checksum, app_path, ext_path)
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if not files:
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files = ofiles
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return files
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def os_unzip(checksum, app_path, ext_path):
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"""Unzip using OS utility."""
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msg = 'Attempting to unzip with OS unzip utility'
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logger.info(msg)
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append_scan_status(checksum, msg)
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try:
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if platform.system() == 'Windows':
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msg = 'Unzipping Error. Not yet implemented in Windows'
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logger.warning(msg)
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append_scan_status(checksum, msg)
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return []
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unzip_b = shutil.which('unzip')
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if not unzip_b:
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msg = 'OS Unzip utility not found'
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logger.warning(msg)
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append_scan_status(checksum, msg)
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return []
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# OS Unzip utility does handle path traversal and absolute paths
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subprocess.call(
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[unzip_b, '-o', '-q', app_path, '-d', ext_path])
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# Set permissions, packed files
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# may not have proper permissions
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set_permissions(ext_path)
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# List files in the unzipped directory
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dat = subprocess.check_output([unzip_b, '-qq', '-l', app_path])
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dat = dat.decode('utf-8').split('\n')
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files_det = ['Length Date Time Name']
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return files_det + dat
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except Exception as exp:
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msg = 'Unzipping Error with OS unzip utility'
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logger.exception(msg)
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append_scan_status(checksum, msg, repr(exp))
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return []
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def lipo_thin(checksum, src, dst):
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"""Thin Fat binary."""
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new_src = None
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try:
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msg = 'Thinning Fat binary'
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logger.info(msg)
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append_scan_status(checksum, msg)
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lipo = shutil.which('lipo')
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out = Path(dst) / (Path(src).stem + '_thin.a')
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new_src = out.as_posix()
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archs = [
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'armv7', 'armv6', 'arm64', 'x86_64',
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'armv4t', 'armv5', 'armv6m', 'armv7f',
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'armv7s', 'armv7k', 'armv7m', 'armv7em',
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'arm64v8']
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for arch in archs:
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args = [
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lipo,
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src,
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'-thin',
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arch,
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'-output',
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new_src]
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out = subprocess.run(
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args,
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stdout=subprocess.DEVNULL,
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stderr=subprocess.STDOUT)
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if out.returncode == 0:
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break
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except Exception as exp:
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msg = 'lipo Fat binary thinning failed'
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logger.warning(msg)
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append_scan_status(checksum, msg, repr(exp))
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return new_src
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def ar_os(src, dst):
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"""Extract AR using OS utility."""
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out = b''
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cur = os.getcwd()
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try:
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os.chdir(dst)
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files = subprocess.check_output(
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[shutil.which('ar'), 't', src],
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stderr=subprocess.STDOUT)
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for raw_file in files.decode('utf-8').split('\n'):
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if is_path_traversal(raw_file):
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msg = f'AR slip detected in AR file {src} at {raw_file}'
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logger.error(msg)
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raise ValueError(msg)
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out = subprocess.check_output(
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[shutil.which('ar'), 'x', src],
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stderr=subprocess.STDOUT)
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except ValueError:
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out = b''
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except Exception as exp:
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out = exp.output
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finally:
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os.chdir(cur)
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return out
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def ar_extract(checksum, src, dst):
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"""Extract AR archive."""
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msg = 'Extracting static library archive'
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logger.info(msg)
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append_scan_status(checksum, msg)
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try:
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ar = arpy.Archive(src)
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ar.read_all_headers()
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for a, val in ar.archived_files.items():
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# Handle archive slip attacks
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filtered = a.decode('utf-8', 'ignore')
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if is_path_traversal(filtered):
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msg = f'Zip slip detected. skipped extracting {filtered}'
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logger.warning(msg)
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append_scan_status(checksum, msg)
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continue
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out = Path(dst) / filtered
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out.write_bytes(val.read())
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except Exception:
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# Possibly dealing with Fat binary, needs Mac host
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msg = 'Failed to extract .a archive'
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logger.warning(msg)
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append_scan_status(checksum, msg)
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# Use os ar utility
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plat = platform.system()
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os_err = 'Possibly a Fat binary. Requires MacOS for Analysis'
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if plat == 'Windows':
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logger.warning(os_err)
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append_scan_status(checksum, os_err)
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return
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msg = 'Using OS ar utility to handle archive'
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logger.info(msg)
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append_scan_status(checksum, msg)
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exp = ar_os(src, dst)
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if len(exp) > 3 and plat == 'Linux':
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# Can't convert FAT binary in Linux
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logger.warning(os_err)
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append_scan_status(checksum, os_err)
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return
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if b'lipo(1)' in exp:
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msg = 'Fat binary archive identified'
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logger.info(msg)
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append_scan_status(checksum, msg)
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# Fat binary archive
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try:
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nw_src = lipo_thin(checksum, src, dst)
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if nw_src:
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ar_os(nw_src, dst)
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except Exception as exp:
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msg = 'Failed to thin fat archive'
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logger.exception(msg)
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append_scan_status(checksum, msg, repr(exp))
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def url_n_email_extract(dat, relative_path):
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"""Extract URLs and Emails from Source Code."""
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urls = set()
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emails = set()
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urllist = []
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url_n_file = []
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email_n_file = []
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# URL Extraction
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urllist = URL_REGEX.findall(dat)
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for url in urllist:
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urls.add(url)
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if urls:
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url_n_file.append({
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'urls': list(urls),
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'path': escape(relative_path)})
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# Email Extraction
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for email in EMAIL_REGEX.findall(dat.lower()):
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if not email.startswith('//'):
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emails.add(email)
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if emails:
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email_n_file.append({
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'emails': list(emails),
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'path': escape(relative_path)})
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return urllist, url_n_file, email_n_file
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# This is just the first sanity check that triggers generic_compare
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@login_required
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def compare_apps(request, hash1: str, hash2: str, api=False):
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if hash1 == hash2:
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error_msg = 'Results with same hash cannot be compared'
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return print_n_send_error_response(request, error_msg, api)
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# Second Validation for REST API
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if not (is_md5(hash1) and is_md5(hash2)):
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error_msg = 'Invalid hashes'
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return print_n_send_error_response(request, error_msg, api)
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logger.info(
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'Starting App compare for %s and %s', hash1, hash2)
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return generic_compare(request, hash1, hash2, api)
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def get_avg_cvss(findings):
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# Average CVSS Score
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cvss_scores = []
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avg_cvss = 0
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for finding in findings.values():
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find = finding.get('metadata')
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if not find:
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# Hack to support iOS Binary Scan Results
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find = finding
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if find.get('cvss'):
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if find['cvss'] != 0:
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cvss_scores.append(find['cvss'])
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if cvss_scores:
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avg_cvss = round(sum(cvss_scores) / len(cvss_scores), 1)
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if not getattr(settings, 'CVSS_SCORE_ENABLED', False):
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avg_cvss = None
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return avg_cvss
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def find_java_source_folder(base_folder: Path):
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# Find the correct java/kotlin source folder for APK/source zip
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# Returns a Tuple of - (SRC_PATH, SRC_TYPE, SRC_SYNTAX)
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return next(p for p in [(base_folder / 'java_source',
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'java', '*.java'),
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(base_folder / 'app' / 'src' / 'main' / 'java',
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'java', '*.java'),
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(base_folder / 'app' / 'src' / 'main' / 'kotlin',
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'kotlin', '*.kt'),
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(base_folder / 'src',
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'java', '*.java')]
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if p[0].exists())
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def is_secret_key(key):
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"""Check if the key in the key/value pair is interesting."""
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key_lower = key.lower()
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# Key ends with these strings
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endswith = (
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'api', 'key', 'secret', 'token', 'username',
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'user_name', 'user', 'pass', 'password',
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'private_key', 'access_key',
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)
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# Key contains these strings
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contains = (
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'api_', 'key_', 'aws', 's3_', '_s3', 'secret_',
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'bearer', 'jwt', 'certificate"', 'credential',
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'azure', 'webhook', 'twilio_', 'bitcoin',
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'_auth', 'firebase', 'oauth', 'authorization',
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'private', 'pwd', 'session', 'token_', 'gcp',
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)
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# Key must not contain these strings
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not_string = (
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'label_', 'text', 'hint', 'msg_', 'create_',
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'message', 'new', 'confirm', 'activity_',
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'forgot', 'dashboard_', 'current_', 'signup',
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'sign_in', 'signin', 'title_', 'welcome_',
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'change_', 'this_', 'the_', 'placeholder',
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'invalid_', 'btn_', 'action_', 'prompt_',
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'lable', 'hide_', 'old', 'update', 'error',
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'empty', 'txt_', 'lbl_',
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)
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not_contains_str = any(i in key_lower for i in not_string)
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contains_str = any(i in key_lower for i in contains)
|
|
endswith_str = any(key_lower.endswith(i) for i in endswith)
|
|
return (endswith_str or contains_str) and not not_contains_str
|
|
|
|
|
|
def strings_and_entropies(checksum, src, exts):
|
|
"""Get Strings and Entropies."""
|
|
msg = 'Extracting String values and entropies from Code'
|
|
logger.info(msg)
|
|
append_scan_status(checksum, msg)
|
|
data = {
|
|
'strings': set(),
|
|
'secrets': set(),
|
|
}
|
|
try:
|
|
if not (src and src.exists()):
|
|
return data
|
|
excludes = ('\\u0', 'com.google.')
|
|
eslash = ('Ljava', 'Lkotlin', 'kotlin', 'android')
|
|
for p in src.rglob('*'):
|
|
if p.suffix not in exts or not p.exists():
|
|
continue
|
|
matches = STRINGS_REGEX.finditer(
|
|
p.read_text(encoding='utf-8', errors='ignore'),
|
|
re.MULTILINE)
|
|
for match in matches:
|
|
string = match.group()
|
|
if len(string) < 4:
|
|
continue
|
|
if any(i in string for i in excludes):
|
|
continue
|
|
if any(i in string and '/' in string for i in eslash):
|
|
continue
|
|
if not string[0].isalnum():
|
|
continue
|
|
data['strings'].add(string)
|
|
if data['strings']:
|
|
data['secrets'] = get_entropies(data['strings'])
|
|
except Exception as exp:
|
|
msg = 'Failed to extract String values and entropies from Code'
|
|
logger.exception(msg)
|
|
append_scan_status(checksum, msg, repr(exp))
|
|
return data
|
|
|
|
|
|
def get_symbols(symbols):
|
|
all_symbols = []
|
|
for i in symbols:
|
|
for _, val in i.items():
|
|
all_symbols.extend(val)
|
|
return list(set(all_symbols))
|
|
|
|
|
|
@login_required
|
|
@permission_required(Permissions.SCAN)
|
|
def scan_library(request, checksum):
|
|
"""Scan a shared library or framework from path name."""
|
|
try:
|
|
libchecksum = None
|
|
if not is_md5(checksum):
|
|
return print_n_send_error_response(
|
|
request,
|
|
'Invalid MD5')
|
|
relative_path = request.GET['library']
|
|
lib_dir = Path(settings.UPLD_DIR) / checksum
|
|
|
|
sfile = lib_dir / relative_path
|
|
if not is_safe_path(lib_dir.as_posix(), sfile.as_posix(), relative_path):
|
|
msg = 'Path Traversal Detected!'
|
|
return print_n_send_error_response(request, msg)
|
|
ext = sfile.suffix
|
|
if not ext and 'Frameworks' in relative_path:
|
|
# Force Dylib on Frameworks
|
|
ext = '.dylib'
|
|
if not sfile.exists():
|
|
msg = 'Library File not found'
|
|
return print_n_send_error_response(request, msg)
|
|
with open(sfile, 'rb') as f:
|
|
libchecksum = handle_uploaded_file(f, ext)
|
|
if ext in [f'.{i}' for i in settings.IOS_EXTS]:
|
|
static_analyzer = 'static_analyzer_ios'
|
|
elif ext == '.appx':
|
|
# Not applicable, but still set it
|
|
static_analyzer = 'windows_static_analyzer'
|
|
elif ext in [f'.{i}' for i in settings.ANDROID_EXTS]:
|
|
static_analyzer = 'static_analyzer'
|
|
else:
|
|
msg = 'Extension not supported'
|
|
return print_n_send_error_response(request, msg)
|
|
data = {
|
|
'analyzer': static_analyzer,
|
|
'status': 'success',
|
|
'hash': libchecksum,
|
|
'scan_type': ext.replace('.', ''),
|
|
'file_name': sfile.name,
|
|
}
|
|
add_to_recent_scan(data)
|
|
return HttpResponseRedirect(f'/{static_analyzer}/{libchecksum}/')
|
|
except Exception:
|
|
msg = 'Failed to perform Static Analysis of library'
|
|
logger.exception(msg)
|
|
return print_n_send_error_response(request, msg)
|