BIND 9.12's serve-stale implementation can cause an assertion failure in rbtdb.c or other undesirable behavior, even if serve-stale is not enabled.
CVE-2018-5737

5.9MEDIUM

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
16 January 2019

What is CVE-2018-5737?

A problem with the implementation of the new serve-stale feature in BIND 9.12 can lead to an assertion failure in rbtdb.c, even when stale-answer-enable is off. Additionally, problematic interaction between the serve-stale feature and NSEC aggressive negative caching can in some cases cause undesirable behavior from named, such as a recursion loop or excessive logging. Deliberate exploitation of this condition could cause operational problems depending on the particular manifestation -- either degradation or denial of service. Affects BIND 9.12.0 and 9.12.1.

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Affected Version(s)

BIND 9 9.12.0 and 9.12.1

References

http://www.securityfocus.com/bid/104236
vdb-entryx_refsource_BID
https://kb.isc.org/docs/aa-01606
x_refsource_CONFIRM
http://www.securitytracker.com/id/1040942
vdb-entryx_refsource_SECTRACK

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

ISC would like to thank Tony Finch of the University of Cambridge for his assistance in discovering and analyzing this vulnerability.
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