CVE-2015-8461: A race condition when handling socket errors can lead to an assertion failure in resolver.c
- Updated on 18 Apr 2016
- 3 minutes to read
15 December 2015
9.9.8 -> 9.9.8-P1, 9.9.8-S1 -> 9.9.8-S2, 9.10.3 -> 9.10.3-P1
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
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)
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
See our BIND9 Security Vulnerability Matrix athttps://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/.
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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-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html
This Knowledge Base article https://kb.isc.org/article/AA-01319 is the complete and official security advisory document.
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