Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0
CVE-2023-2911

7.5HIGH

Key Information:

Vendor
Isc
Status
Bind 9
Vendor
CVE Published:
21 June 2023

Badges

👾 Exploit Exists

Summary

A critical issue has been identified in BIND 9 resolvers, where if the 'recursive-clients' quota is met alongside configurations that enable stale answers, a series of related queries can lead to an unexpected loop and crash of the 'named' service due to stack overflow. This affects multiple versions of BIND 9, necessitating immediate attention from system administrators to mitigate potential disruptions.

Affected Version(s)

BIND 9 9.16.33 <= 9.16.41

BIND 9 9.18.7 <= 9.18.15

BIND 9 9.16.33-S1 <= 9.16.41-S1

References

https://kb.isc.org/docs/cve-2023-2911
vendor-advisory
http://www.openwall.com/lists/oss-security/2023/06/21/6
https://lists.fedoraproject.org/archives/list/package-ann...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.