Description
If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow. This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- ISC / BIND 99.16.33 – 9.16.41
- ISC / BIND 99.18.7 – 9.18.15
- ISC / BIND 99.16.33-S1 – 9.16.41-S1
- ISC / BIND 99.18.11-S1 – 9.18.15-S1
References
- MISChttps://kb.isc.org/docs/cve-2023-2911
- MAILING_LISThttp://www.openwall.com/lists/oss-security/2023/06/21/6
- MAILING_LISThttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/
- VENDOR_ADVISORYhttps://www.debian.org/security/2023/dsa-5439
- MAILING_LISThttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/
- MISChttps://security.netapp.com/advisory/ntap-20230703-0010/