CVE-2012-4244: A specially crafted Resource Record could cause named to terminate
A nameserver can be caused to exit with a REQUIRE exception if it can be induced to load a specially crafted resource record.
Document version: 2.0
Posting date: 12 September 2012
Program impacted: BIND
Versions affected: 9.0.x -> 9.6.x, 9.4-ESV->9.4-ESV-R5-P1, 9.6-ESV->9.6-ESV-R7-P2, 9.7.0->9.7.6-P2, 9.8.0->9.8.3-P2, 9.9.0->9.9.1-P2
If a record with RDATA in excess of 65535 bytes is loaded into a nameserver, a subsequent query for that record will cause named to exit with an assertion failure.
Please note: Versions of BIND 9.4 and 9.5 are also affected, but these branches are beyond their "end of life" (EOL) and no longer receive testing or security fixes from ISC. For current information on which versions are actively supported, please see https://www.isc.org/downloads.
This vulnerability can be exploited remotely against recursive servers by inducing them to query for records provided by an authoritative server. It affects authoritative servers if a zone containing this type of resource record is loaded from file or provided via zone transfer.
CVSS Score: 7.8
CVSS Equation: (AV:N/AC:L/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: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C).
Workarounds: Workarounds are under investigation, but none are known at this time.
Active exploits: No known active exploits.
Solution: Upgrade to the patched version or new release most closely related to your current version of BIND. The patched versions of BIND can be downloaded from https://www.isc.org/downloads/. The new release versions will be available within the next week.
- BIND 9 version 9.7.7, 9.7.6-P3
- BIND 9 version 9.6-ESV-R8, 9.6-ESV-R7-P3
- BIND 9 version 9.8.4, 9.8.3-P3
- BIND 9 version 9.9.2, 9.9.1-P3
Document Revision History:
1.0 - Advance Notification to Phase 1, 4 September 2012
1.1 - Corrected error in Description (65535 bytes), 6 September 2012
1.2 - Phase 2 & 3 notified, 11 September 2012
2.0 - Phase 4 - Public Release, 12 Sept. 2012
If you'd like more information on ISC Subscription Support and Advance Security Notifications, please visit https://www.isc.org/support/.
See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected.
Do you still have questions? Questions regarding this advisory should go to email@example.com. To report a new issue, please encrypt your message using firstname.lastname@example.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 https://www.isc.org/downloads/.)
ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy.
This Knowledgebase article is the complete and official security advisory document.
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