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U-260: ISC BIND RDATA Processing Flaw Lets Remote Users Deny Service

September 14, 2012 - 6:00am

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PROBLEM:

ISC BIND RDATA Processing Flaw Lets Remote Users Deny Service

PLATFORM:

Version(s): 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

ABSTRACT:

A vulnerability was reported in ISC BIND.

reference LINKS:

The vendor's advisory
SecurityTracker Alert ID:  1027529
Bugtraq ID:  55522 
Red Hat Bugzilla – Bug 856754
CVE-2012-4244

IMPACT ASSESSMENT:

High

Discussion:

A remote user can send a query for a record that has RDATA in excess of 65535 bytes to cause named to exit.  This can be exploited against recursive servers by causing the server to query for records provided by an authoritative server. Authoritative servers are affected if a zone containing a specially crafted resource record is loaded from file or provided via zone transfer.

Impact:

A remote user can cause the target named service to crash.

Solution:

The vendor has issued a fix (9.7.6-P3, 9.7.7, 9.6-ESV-R7-P3, 9.6-ESV-R8, 9.8.3-P3, 9.8.4, 9.9.1-P3, 9.9.2).

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