A specially crafted query sent to a BIND
nameserver can cause it to crash (terminate abnormally).
Posting date: 26 July 2013
Open source: 9.7.0->9.7.7, 9.8.0->9.8.5-P1,
9.9.0->9.9.3-P1, 9.8.6b1 and 9.9.4b1; Subscription: 9.9.3-S1 and 9.9.4-S1b1
A specially crafted query that includes malformed rdata can cause named to terminate with an assertion failure while rejecting the malformed query.
BIND 9.6 and BIND 9.6-ESV are unaffected by this problem. Earlier branches of BIND 9 are believed to be unaffected but have not been tested. BIND 10 is also unaffected by this issue.
Please Note: All versions of BIND 9.7 are known to be 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 http://www.isc.org/downloads/software-support-policy/bind-software-status/.
Authoritative and recursive servers are equally vulnerable. Intentional exploitation of this
condition can cause a denial of service in all nameservers running affected versions of BIND 9. Access Control Lists do not provide any protection from malicious clients.
In addition to the named server, applications built using libraries from the affected source distributions may crash with assertion failures triggered in the same fashion.
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)
No known workarounds at this time.
Crashes have been reported by multiple ISC customers. First observed in the wild on 26 July 2013.
Solution: Upgrade to the patched release most closely related to your current version of BIND. Open source versions can all be downloaded from http://www.isc.org/downloads. Subscription version customers will be contacted directly by ISC Support regarding delivery.
- BIND 9 version 9.8.5-P2
- BIND 9 version 9.9.3-P2
- BIND 9 version 9.9.3-S1-P1 (Subscription version available via DNSco)
Acknowledgements: ISC would like to thank Maxim Shudrak and the HP Zero Day Initiative for reporting this issue.
Document Revision History:
1.0 Phase One Advance Notification, 18 July 2013
1.1 Phases Two and Three Advance Notification, 26 July 2013
2.0 Notification to public (Phase Four), 26 July 2013
Spanish Translation: planned
Japanese Translation: https://kb.isc.org/article/AA-01023
Portuguese Translation: https://kb.isc.org/article/AA-01021
See our BIND Security Matrix for a complete listing of Security Vulnerabilities and versions affected.
This Knowledge Base article https://kb.isc.org/article/AA-01016 provides additional information and Frequently Asked Questions about this advisory.
If you'd like more information on our product support or about our Subscription versions of BIND, please visit http://www.dns-co.com/solutions/.
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/mission/contact/.
Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected.
ISC Security Vulnerability Disclosure Policy: Details of our current security advisory policy and practice can be found here: ISC Software Defect and Security Vulnerability Disclosure Policy
This Knowledge Base article https://kb.isc.org/article/AA-01015 is the complete and official security advisory document.
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