CVE-2015-8000: Responses with a malformed class attribute can trigger an assertion failure in db.c
mcnally at isc.org
Tue Dec 15 21:16:47 UTC 2015
Document Version: 2.0
Posting date: 15 December 2015
Program Impacted: BIND
Versions affected: 9.0.x -> 9.9.8, 9.10.0 -> 9.10.3
An error in the parsing of incoming responses allows some records
with an incorrect class to be be accepted by BIND instead of
being rejected as malformed. This can trigger a REQUIRE assertion
failure when those records are subsequently cached. Intentional
exploitation of this condition is possible and could be used as
a denial-of-service vector against servers performing recursive
An attacker who can cause a server to request a record with a
malformed class attribute can use this bug to trigger a REQUIRE
assertion in db.c, causing named to exit and denying service to
clients. The risk to recursive servers is high. Authoritative
servers are at limited risk if they perform authentication when
making recursive queries to resolve addresses for servers listed
in NS RRSETs.
CVSS Score: 7.1
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C)
For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
Active exploits: No known active exploits.
Upgrade to the patched release most closely related to your
current version of BIND. Public open-source branches can be
downloaded from http://www.isc.org/downloads.
BIND 9 version 9.9.8-P2
BIND 9 version 9.10.3-P2
BIND 9 Supported Preview edition is a feature preview version
of BIND provided exclusively to ISC Support customers.
BIND 9 version 9.9.8-S3
Document Revision History:
1.0 Advance Notification, 24 November, 2015
1.1 Software releases 9.9.8-P1 and 9.10.3-P1 replaced with
9.9.8-P2 and 9.10.3-P2 to address CVE-2015-8461, advisory
text and schedule updated, 8 December 2015
2.0 Public Disclosure, 15 December 2015
See our BIND9 Security Vulnerability Matrix at
https://kb.isc.org/article/AA-00913 for a complete listing of
Security Vulnerabilities and versions affected.
Do you still have questions?
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ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on
which versions are actively supported, please see
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can
be found here: https://kb.isc.org/article/AA-00861
This Knowledge Base article https://kb.isc.org/article/AA-01317 is
the complete and official security advisory document.
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