minor adjustment of a time based char retrievals (no more infinite increasing of timeSec value for problematic characters)

doc/THANKS

@@ -586,6 +586,13 @@ fufuh <[email protected]>
 james <[email protected]>
     for reporting a bug
 
+Joe "Pragmatk" <[email protected]>
+    for reporting a few bugs
+
+John Smith <[email protected]>
+    for reporting several bugs
+    for suggesting some features
+
 m4l1c3 <[email protected]>
     for reporting considerable amount of bugs
 
@@ -598,26 +605,22 @@ mitchell <[email protected]>
 nightman <[email protected]>
     for reporting considerable amount of bugs
 
+Oso Dog [email protected]
+    for reporting a minor bug
+
 pacman730 <[email protected]>
     for reporting a bug
 
+pentestmonkey <[email protected]>
+    for reporting several bugs
+    for suggesting a few minor enhancements
+
 Phat R. <[email protected]>
     for reporting a few bugs
 
 Phil P <@superevr>
     for suggesting a minor enhancement
 
-Joe "Pragmatk" <[email protected]>
-    for reporting a few bugs
-
-John Smith <[email protected]>
-    for reporting several bugs
-    for suggesting some features
-
-pentestmonkey <[email protected]>
-    for reporting several bugs
-    for suggesting a few minor enhancements
-
 ragos <[email protected]>
     for reporting a minor bug
 

lib/core/option.py

@@ -1432,6 +1432,7 @@ def __setKnowledgeBaseAttributes(flushAll=True):
     kb.pageTemplates = dict()
     kb.orderByColumns = None
     kb.originalPage = None
+    kb.originalTimeDelay = None
 
     # Back-end DBMS underlying operating system fingerprint via banner (-b)
     # parsing

lib/core/settings.py

@@ -391,3 +391,6 @@ TRIM_STDOUT_DUMP_SIZE = 1024
 
 # Step used in ORDER BY technique used for finding the right number of columns in UNION query injections
 ORDER_BY_STEP = 10
+
+# Maximum number of times for revalidation of a character in time-based injections
+MAX_TIME_REVALIDATION_STEPS = 5

lib/techniques/blind/inference.py

@@ -44,6 +44,7 @@ from lib.core.settings import INFERENCE_UNKNOWN_CHAR
 from lib.core.settings import INFERENCE_GREATER_CHAR
 from lib.core.settings import INFERENCE_EQUALS_CHAR
 from lib.core.settings import INFERENCE_NOT_EQUALS_CHAR
+from lib.core.settings import MAX_TIME_REVALIDATION_STEPS
 from lib.core.settings import PYVERSION
 from lib.core.threads import getCurrentThreadData
 from lib.core.threads import runThreads
@@ -259,16 +260,23 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
                                 errMsg = "invalid character detected. retrying.."
                                 logger.error(errMsg)
 
-                                conf.timeSec += 1
-                                warnMsg = "increasing time delay to %d second%s " % (conf.timeSec, 's' if conf.timeSec > 1 else '')
-                                warnMsg += "(due to invalid char)"
-                                logger.warn(warnMsg)
+                                if not kb.originalTimeDelay:
+                                    kb.originalTimeDelay = conf.timeSec
 
-                                if kb.adjustTimeDelay:
-                                    dbgMsg = "turning off auto-adjustment mechanism"
-                                    logger.debug(dbgMsg)
-                                    kb.adjustTimeDelay = False
-                                return getChar(idx, originalTbl, continuousOrder, expand)
+                                conf.timeSec += 1
+                                if (conf.timeSec - kb.originalTimeDelay) <= MAX_TIME_REVALIDATION_STEPS:
+                                    warnMsg = "increasing time delay to %d second%s " % (conf.timeSec, 's' if conf.timeSec > 1 else '')
+                                    warnMsg += "(due to invalid char)"
+                                    logger.warn(warnMsg)
+
+                                    if kb.adjustTimeDelay:
+                                        dbgMsg = "turning off auto-adjustment mechanism"
+                                        logger.debug(dbgMsg)
+                                        kb.adjustTimeDelay = False
+                                    return getChar(idx, originalTbl, continuousOrder, expand)
+                                else:
+                                    conf.timeSec = kb.originalTimeDelay
+                                    return None
                             else:
                                 return decodeIntToUnicode(retVal)
                         else: