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Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
BIND DNSSEC Validation Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1017573
SecurityTracker URL:  http://securitytracker.com/id/1017573
CVE Reference:   CVE-2007-0494   (Links to External Site)
Updated:  Jan 31 2007
Original Entry Date:  Jan 30 2007
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.0.x, 9.1.x, 9.2.0 - 9.2.7, 9.3.0 - 9.3.3, 9.4.x prior to 9.4.0rc2
Description:   A vulnerability was reported in BIND. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to cause the target service to crash. A type * (ANY) DNS query that results in a response with multiple RRsets can trigger this flaw in the DNSSEC validation code.

The following versions are affected:

BIND 9.0.x
BIND 9.1.x
BIND 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.2.7
BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3
BIND 9.4.0a1, 9.4.0a2, 9.4.0a3, 9.4.0a4, 9.4.0a5, 9.4.0a6, 9.4.0b1, 9.4.0b2, 9.4.0b3, 9.4.0b4, 9.4.0rc1
BIND 9.5.0a1 (Bind Forum only)

Impact:   A remote user can cause the target name service to crash.
Solution:   The vendor has issued fixed versions (9.2.8, 9.3.4, and 9.4.0rc2).

The fix will be included in the upcoming BIND 9.5.0a2 release.

[Editor's note: This solution also addresses a separate BIND vulnerability that was previously reported in Alert ID 1017561.]

Vendor URL:  www.isc.org/ (Links to External Site)
Cause:   State error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Feb 6 2007 (Red Hat Issues Fix) BIND DNSSEC Validation Bug Lets Remote Users Deny Service   (bugzilla@redhat.com)
Red Hat has released a fix for Red Hat Enterprise Linux 2.1, 3, and 4.
Feb 12 2007 (FreeBSD Issues Fix) BIND DNSSEC Validation Bug Lets Remote Users Deny Service   (FreeBSD Security Advisories <security-advisories@freebsd.org>)
FreeBSD has released a fix for named(8).
Mar 9 2007 (NetBSD Issues Fix) BIND DNSSEC Validation Bug Lets Remote Users Deny Service   (NetBSD Security-Officer <security-officer@NetBSD.org>)
NetBSD has released a fix.
Mar 14 2007 (Red Hat Issues Fix) BIND DNSSEC Validation Bug Lets Remote Users Deny Service   (bugzilla@redhat.com)
Red Hat has released a fix for Red Hat Enterprise Linux 5.
Apr 16 2007 (HP Issues Fix for Tru64 UNIX) BIND DNSSEC Validation Bug Lets Remote Users Deny Service
HP has issued a fix for HP Tru64 UNXI 4.0F PK8, 4.0G PK4, 5.1A PK6, 5.1B-3, and 5.1B-4.
May 24 2007 (Apple Issues Fix) BIND DNSSEC Validation Bug Lets Remote Users Deny Service   (Apple Product Security <product-security-noreply@lists.apple.com>)
Apple has released a fix for Mac OS X.
May 31 2007 (IBM Issues Fix for AIX) BIND DNSSEC Validation Bug Lets Remote Users Deny Service
IBM has issued a fix for AIX 5.2 and 5.3.
Jun 12 2007 (HP Issues Fix for HP-UX) BIND DNSSEC Validation Bug Lets Remote Users Deny Service
HP has issued a fix for BIND on HP-UX 11.11 and 11.23.
Jun 18 2007 (Solaris Issues Fix) BIND DNSSEC Validation Bug Lets Remote Users Deny Service
Sun has issued a fix for Solaris 10.



 Source Message Contents

Date:  Tue, 30 Jan 2007 11:24:13 -0500
Subject:  BIND


http://www.isc.org/sw/bind/bind-security.php

Name: "BIND 9: DNSSEC Validation"
[Added 2007.01.30] Versions affected:     BIND 9.0.x (all versions of BIND 9.0) (at end-of-life)
BIND 9.1.x (all versions of BIND 9.1) (at end-of-life)
BIND 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.2.7
BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3
BIND 9.4.0a1, 9.4.0a2, 9.4.0a3, 9.4.0a4, 9.4.0a5, 9.4.0a6, 9.4.0b1
9.4.0b2, 9.4.0b3, 9.4.0b4, 9.4.0rc1 
BIND 9.5.0a1 (Bind Forum only)
 
Severity:     Low 
Exploitable:     Remotely 

Description:
CVE-2007-0493

When validating responses to type * (ANY) queries that return multiple RRsets in the 
answer section it is possible to trigger assertions checks. To be vulnerable you need 
to have enabled dnssec validation in named.conf by specifying trusted-keys. 

Workaround:
Disable / restrict recursion (to limit exposure). Disable DNSSEC validation (remove all 
trusted-keys from named.conf). 

Fix:
Upgrade to BIND 9.2.8, BIND 9.3.4 or BIND 9.4.0rc2. Additionally this will be fixed in 
the upcoming BIND 9.5.0a2. 

Note:
It is recommended that anyone using DNSSEC upgrade to BIND 9.3 as the DNSSEC 
implementation in BIND 9.2 has been obsoleted. 
 
 


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