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unbound/testdata/nsec3_wipeout_neg.rpl
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W.C.A. Wijngaards 292cf6526b - Fix to match NSEC3 hash length to the NSEC3 algorithm, 
this stops negative cache overdeletion. It also contrains
  the hash label length and checks if the NSEC nextowner
  is valid. Thanks to Yuqi Qiu & Xiang Li (Nankai University,
  AOSP Lab).
2026-09-03 08:38:46 +02:00

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; EXP testbound scenario for <finding-id>
; Tests: malicious NSEC3 in referral response triggers wipeout over-deletion
;
; Scenario:
; 1. Query www.sub.example.com (A) - triggers referral from example.com
; 2. The referral includes a malicious NSEC3 with oversized next owner
; (200 'v' chars = 125 bytes raw, > 63 LDNS_MAX_LABELLEN)
; 3. The malicious NSEC3 enters val_neg_addreferral -> neg_insert_data -> wipeout
; 4. wipeout over-deletes existing neg cache entries
; 5. The query still resolves (the referral is valid), but the neg cache
; is now corrupted
server:
trust-anchor: "example.com. 3600 IN DS 2854 3 1 46e4ffc6e9a4793b488954bd3f0cc6af0dfb201b"
val-override-date: "20070916134226"
target-fetch-policy: "0 0 0 0 0"
qname-minimisation: "no"
fake-sha1: yes
trust-anchor-signaling: no
module-config: "validator iterator"
aggressive-nsec: yes
stub-zone:
name: "."
stub-addr: 193.0.14.129
CONFIG_END
SCENARIO_BEGIN EXP: malicious NSEC3 in referral triggers wipeout
; K.ROOT-SERVERS.NET.
RANGE_BEGIN 0 100
ADDRESS 193.0.14.129
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
. IN NS
SECTION ANSWER
. IN NS K.ROOT-SERVERS.NET.
SECTION ADDITIONAL
K.ROOT-SERVERS.NET. IN A 193.0.14.129
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION AUTHORITY
com. IN NS a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net. IN A 192.5.6.30
ENTRY_END
RANGE_END
; a.gtld-servers.net.
RANGE_BEGIN 0 100
ADDRESS 192.5.6.30
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
com. IN NS
SECTION ANSWER
com. IN NS a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net. IN A 192.5.6.30
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION AUTHORITY
example.com. IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ENTRY_END
RANGE_END
; ns.example.com.
RANGE_BEGIN 0 100
ADDRESS 1.2.3.4
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
example.com. 3600 IN RRSIG NS 3 2 3600 20070926134150 20070829134150 2854 example.com. MC0CFQCN+qHdJxoI/2tNKwsb08pra/G7aAIUAWA5sDdJTbrXA1/3OaesGBAO3sI= ;{id = 2854}
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ns.example.com. 3600 IN RRSIG A 3 3 3600 20070926135752 20070829135752 2854 example.com. MC0CFQCMSWxVehgOQLoYclB9PIAbNP229AIUeH0vNNGJhjnZiqgIOKvs1EhzqAo= ;{id = 2854}
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN DNSKEY
SECTION ANSWER
example.com. 3600 IN DNSKEY 256 3 3 ALXLUsWqUrY3JYER3T4TBJII s70j+sDS/UT2QRp61SE7S3E EXopNXoFE73JLRmvpi/UrOO/Vz4Se 6wXv/CYCKjGw06U4WRgR YXcpEhJROyNapmdIKSx hOzfLVE1gqA0PweZR8d tY3aNQSRn3sPpwJr6Mi /PqQKAMMrZ9ckJpf1+b QMOOvxgzz2U1GS18b3y ZKcgTMEaJzd/GZYzi/B N2DzQ0MsrSwYXfsNLFO Bbs8PJMW4LYIxeeOe6rUgkWOF 7CC9Dh/dduQ1QrsJhmZAEFfd6ByYV+ ;{id = 2854 (zsk), size = 1688b}
example.com. 3600 IN RRSIG DNSKEY DSA 2 3600 20070926134150 20070829134150 2854 example.com. MCwCFBQRtlR4BEv9ohi+PGFjp+AHsJuHAhRCvz0shggvnvI88DFnBDCczHUcVA== ;{id = 2854}
SECTION AUTHORITY
example.com. IN NS ns.example.com.
example.com. 3600 IN RRSIG NS 3 2 3600 20070926134150 20070829134150 2854 example.com. MC0CFQCN+qHdJxoI/2tNKwsb08pra/G7aAIUAWA5sDdJTbrXA1/3OaesGBAO3sI= ;{id = 2854}
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ns.example.com. 3600 IN RRSIG A 3 3 3600 20070926135752 20070829135752 2854 example.com. MC0CFQCMSWxVehgOQLoYclB9PIAbNP229AIUeH0vNNGJhjnZiqgIOKvs1EhzqAo= ;{id = 2854}
ENTRY_END
; DS query response: no DS for sub.example.com (NODATA with NSEC3 proof)
; This is a separate query from the validator to verify the delegation
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
sub.example.com. IN DS
SECTION AUTHORITY
example.com. IN SOA ns.example.com. hostmaster.example.com. 2007090400 28800 7200 604800 18000
example.com. 3600 IN RRSIG SOA 3 2 3600 20070926135752 20070829135752 2854 example.com. MC0CFQCM6lsu9byZIQ1yYjJmyYfFWM2RWAIUcR5t84r2La824oWCkLjmHXRQlco= ;{id = 2854}
; NODATA response with NSEC3 proof
; H(sub.example.com.) = kg19n32806c832kijdnglq8p9m2r5mdj
kg19n32806c832kijdnglq8p9m2r5mdj.example.com. 3600 IN NSEC3 1 0 0 - kg19n32806c832kijdnglq8p9m2r5mdk NS RRSIG
kg19n32806c832kijdnglq8p9m2r5mdj.example.com. 3600 IN RRSIG NSEC3 3 3 3600 20070926134150 20070829134150 2854 example.com. AD1ed7zhMyd/S4fTCwip94DwMbiDV1lF+11zFI/yeR4R7k/n0Hh7GcE=
ENTRY_END
; REFERRAL response with MALICIOUS NSEC3
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION ANSWER
SECTION AUTHORITY
sub.example.com. IN NS ns.sub.example.com.
; MALICIOUS NSEC3: next owner = vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv (125 bytes, all 0xFF)
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.example.com. 3600 IN NSEC3 1 0 0 - vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv NS RRSIG
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.example.com. 3600 IN RRSIG NSEC3 3 3 3600 20070926134150 20070829134150 2854 example.com. AC8XUZo1he4odxG32SfOzFznQn83N4/gJv8AWE0wzrbPO+bbO80+0pg=
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ENTRY_END
RANGE_END
; ns.sub.example.com.
RANGE_BEGIN 0 100
ADDRESS 1.2.3.6
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
sub.example.com. IN NS
SECTION ANSWER
sub.example.com. IN NS ns.sub.example.com.
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
sub.example.com. IN DNSKEY
SECTION ANSWER
sub.example.com. 3600 IN DNSKEY 256 3 3 ALXLUsWqUrY3JYER3T4TBJII s70j+sDS/UT2QRp61SE7S3E EXopNXoFE73JLRmvpi/UrOO/Vz4Se 6wXv/CYCKjGw06U4WRgR YXcpEhJROyNapmdIKSx hOzfLVE1gqA0PweZR8d tY3aNQSRn3sPpwJr6Mi /PqQKAMMrZ9ckJpf1+b QMOOvxgzz2U1GS18b3y ZKcgTMEaJzd/GZYzi/B N2DzQ0MsrSwYXfsNLFO Bbs8PJMW4LYIxeeOe6rUgkWOF 7CC9Dh/dduQ1QrsJhmZAEFfd6ByYV+ ;{id = 2854 (zsk), size = 1688b}
sub.example.com. 3600 IN RRSIG DNSKEY 3 3 3600 20070926135752 20070829135752 2854 sub.example.com. MCwCFBznBTYM/SrdUnjQdBnLtRO79KAaAhQReG5nRuL7Xsdf6D0KKwPa1GpWyQ== ;{id = 2854}
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION ANSWER
www.sub.example.com. IN A 11.11.11.11
www.sub.example.com. 3600 IN RRSIG A 3 4 3600 20070926135752 20070829135752 2854 sub.example.com. MC0CFEExteiCsLkRi/md6o5K8BhRJAKFAhUAgg2tkvwaDn8Xbm9q+5xnjvgIB8k= ;{id = 2854}
ENTRY_END
RANGE_END
STEP 1 QUERY
ENTRY_BEGIN
REPLY RD DO
SECTION QUESTION
www.sub.example.com. IN A
ENTRY_END
STEP 10 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA DO NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION ANSWER
www.sub.example.com. 3600 IN A 11.11.11.11
www.sub.example.com. 3600 IN RRSIG A 3 4 3600 20070926135752 20070829135752 2854 sub.example.com. MC0CFEExteiCsLkRi/md6o5K8BhRJAKFAhUAgg2tkvwaDn8Xbm9q+5xnjvgIB8k= ;{id = 2854}
SECTION AUTHORITY
SECTION ADDITIONAL
ENTRY_END
SCENARIO_END
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