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Date: Tue, 15 Dec 2015 18:10:13 -0500
From: Michael McNally <mcnally@....org>
To: oss-security@...ts.openwall.com
Subject: CVE-2015-8461: A race condition when handling socket errors can lead
to an assertion failure in resolver.c
CVE: CVE-2015-8461
Document Version: 2.0
Posting date: 15 December 2015
Program Impacted: BIND
Versions affected: 9.9.8 -> 9.9.8-P1, 9.9.8-S1 -> 9.9.8-S2, 9.10.3 ->
9.10.3-P1
Severity: Medium
Exploitable: Remotely
Description:
Beginning with the September 2015 maintenance releases 9.9.8 and
9.10.3, an error was introduced into BIND 9 which can cause a
server to exit after encountering an INSIST assertion failure
in resolver.c
Impact:
An uncommonly occurring condition can cause affected servers to
exit with an INSIST failure depending on the outcome of a race
condition in resolver.c While difficult to exploit reliably, a
malicious party could, through deliberate behavior, significantly
increase the probability of encountering the triggering condition,
resulting in denial-of-service to clients if successful.
CVSS Score: 5.4
CVSS Vector: (AV:N/AC:H/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:
https://nvd.nist.gov/cvss.cfm?calculator&version=2&vector=(AV:N/AC:H/Au:N/C:N/I:N/A:C)
Workarounds: None.
Active exploits: None known.
Solution:
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 eligible ISC Support customers.
BIND 9 version 9.9.8-S3
Acknowledgements:
ISC would like to thank John O'Brien of the University of
Pennsylvania for discovering this issue.
Document Revision History:
1.0 Advance Notification 8 December 2015
2.0 Public Disclosure, 15 December 2015
Related Documents:
See our BIND9 Security Vulnerability Matrix at
https://kb.isc.org/article/AA-00913 for a complete listing of
Security Vulnerabilities and versions affected.
If you'd like more information on ISC Subscription Support and
Advance Security Notifications, please visit http://www.isc.org/support/.
Do you still have questions? Questions regarding this advisory
should go to security-officer@....org. To report a new issue,
please encrypt your message using security-officer@....org's PGP
key which can be found here:
https://www.isc.org/downloads/software-support-policy/openpgp-key/.
If you are unable to use encrypted email, you may also report new
issues at: https://www.isc.org/community/report-bug/.
Note:
ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on
which versions are actively supported, please see
http://www.isc.org/downloads/).
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-01319 is
the complete and official security advisory document.
Legal Disclaimer:
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Uncontrolled copies may lack important information, be out of
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