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Category:   Application (Generic)  >   Libxml2 Vendors:   xmlsoft.org
Libxml2 Heap Overflow in xmlParseAttValueComplex() Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1020855
SecurityTracker URL:  http://securitytracker.com/id/1020855
CVE Reference:   CVE-2008-3529   (Links to External Site)
Date:  Sep 11 2008
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.7.0
Description:   A vulnerability was reported in Libxml2. A remote user can cause arbitrary code to be executed on the target system.

A remote user can create a specially crafted XML entity name that, when processed by the target application using libxml2, will trigger a heap overflow and execute arbitrary code on the target system. The code will run with the privileges of the target application.

The vulnerability resides in the xmlParseAttValueComplex() function in 'parser.c'.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fixed version (2.7.0).
Vendor URL:  xmlsoft.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 11 2008 (Red Hat Issues Fix) Libxml2 Heap Overflow in xmlParseAttValueComplex() Lets Remote Users Execute Arbitrary Code   (bugzilla@redhat.com)
Red Hat has released a fix for Red Hat Enterprise Linux 3, 4, and 5.
Sep 12 2008 (Red Hat Issues Fix) Libxml2 Heap Overflow in xmlParseAttValueComplex() Lets Remote Users Execute Arbitrary Code   (bugzilla@redhat.com)
Red Hat has released a fix for Red Hat Enterprise Linux 2.1.
May 13 2009 (Apple Issues Fix for Safari) Libxml2 Heap Overflow in xmlParseAttValueComplex() Lets Remote Users Execute Arbitrary Code   (Apple Product Security <product-security-noreply@lists.apple.com>)
Apple has released a fix for Safari.
Aug 10 2009 (Sun Issues fix for Sun Java System Access Manager) Libxml2 Heap Overflow in xmlParseAttValueComplex() Lets Remote Users Execute Arbitrary Code
Sun has issued a fix for Sun Java System Access Manager Policy Agent.



 Source Message Contents

Date:  Thu, 11 Sep 2008 16:41:22 -0400
Subject:  libxml2


Red Hat said:

It was discovered, that libxml2 does not properly handle long XML entity names.
 In the xmlParseAttValueComplex() function in parser.c, when entity name is not
substituted with entity value, but is sent to output unchanged, buffer used to
store entity name may not be grown sufficiently in case of long entity names,
resulting in a heap buffer overflow.

Issue is already fixed upstream in version 2.7.0.

CVE-2008-3529
 
 


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