CVE-2022-3080: BIND 9 resolvers configured to answer from stale cache with zero stale-answer-client-timeout may terminate unexpectedly
Document version: 2.0
Posting date: 21 September 2022
Program impacted: BIND
- 9.16.14 -> 9.16.32
- 9.18.0 -> 9.18.6
- 9.19.0 -> 9.19.4
BIND Supported Preview Edition
- 9.16.14-S1 -> 9.16.32-S1 (Note that no versions of the BIND 9.11 Supported Preview Edition are vulnerable).
BIND 9 resolver can crash when stale cache and stale answers are enabled, option
stale-answer-client-timeout is set to
0 and there is a stale CNAME in the cache for an incoming query.
By sending specific queries to the resolver, an attacker can cause
named to crash.
CVSS Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H&version=3.1.
off or to an integer greater than
0 will prevent BIND from crashing due to this issue.
We are not aware of any active exploits.
Upgrade to the patched release most closely related to your current version of BIND:
BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.
ISC would like to thank Maksym Odinintsev for bringing this vulnerability to our attention.
Document revision history:
1.0 Early Notification, 14 September 2022
1.1 Minor punctuation corrections, 19 September 2022
1.2 Fixed the option name used in the CVE title, 21 September 2022
2.0 Public disclosure, 21 September 2022
See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected.
Do you still have questions? Questions regarding this advisory should be mailed to [email protected]. To report a new issue, please encrypt your message using [email protected]'s PGP key, which can be found here: https://www.isc.org/pgpkey/. If you are unable to use encrypted email you may also report new issues at: https://www.isc.org/reportbug/.
ISC patches only currently supported versions. When possible we indicate EOL versions affected. For current information on which versions are actively supported, please see https://www.isc.org/download/.
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy at https://kb.isc.org/docs/aa-00861.
The Knowledgebase article https://kb.isc.org/docs/cve-2022-3080 is the complete and official security advisory document.
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