oss-security - BIND: Handling of zero length rdata can cause named to terminate unexpectedly

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Date: Tue, 5 Jun 2012 11:08:14 +0400
From: Solar Designer <solar@...nwall.com>
To: oss-security@...ts.openwall.com
Subject: BIND: Handling of zero length rdata can cause named to terminate unexpectedly

Hi,

I think we should have this in here.  This is CVE-2012-1667.

http://www.isc.org/software/bind/advisories/cve-2012-1667

"Handling of zero length rdata can cause named to terminate unexpectedly

Summary:
Processing of DNS resource records where the rdata field is zero length
may cause various issues for the servers handling them.

CVE: CVE-2012-1667
Posting date: 04 Jun 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, 9.7.0->9.7.6, 9.8.0->9.8.3, 9.9.0->9.9.1
Severity: Critical
Exploitable: Remotely

Description:
This problem was uncovered while testing with experimental DNS record
types. It is possible to add records to BIND with null (zero length)
rdata fields.

Processing of these records may lead to unexpected outcomes. Recursive
servers may crash or disclose some portion of memory to the client.
Secondary servers may crash on restart after transferring a zone
containing these records. Master servers may corrupt zone data if the
zone option "auto-dnssec" is set to "maintain". Other unexpected
problems that are not listed here may also be encountered.

Impact: This issue primarily affects recursive nameservers.
Authoritative nameservers will only be impacted if an administrator
configures experimental record types with no data. If the server is
configured this way, then secondaries can crash on restart after
transferring that zone. Zone data on the master can become corrupted if
the zone with those records has named configured to manage the DNSSEC
key rotation."

"Solution:
Upgrade to BIND version 9.6-ESV-R7-P1, 9.7.6-P1, 9.8.3-P1, or 9.9.1-P1

Acknowledgment: Dan Luther, Level3 Communications, for finding the
issue, Jeffrey A. Spain, Cincinnati Day School, for replication and
testing."

Sounds like backporting time...

Alexander

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