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[ GLSA 201202-09 ] libxml2: User-assisted execution of arbitrary code
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PostPosted: Wed Feb 29, 2012 8:26 pm    Post subject: [ GLSA 201202-09 ] libxml2: User-assisted execution of arbit Reply with quote

Gentoo Linux Security Advisory

Title: libxml2: User-assisted execution of arbitrary code (GLSA 201202-09)
Severity: normal
Exploitable: remote
Date: February 29, 2012
Bug(s): #398361
ID: 201202-09

Synopsis

A boundary error in libxml2 could result in execution of arbitrary
code or Denial of Service.


Background

libxml2 is the XML C parser and toolkit developed for the Gnome project.

Affected Packages

Package: dev-libs/libxml2
Vulnerable: < 2.7.8-r4
Unaffected: >= 2.7.8-r4
Architectures: All supported architectures


Description

The "xmlStringLenDecodeEntities()" function in parser.c contains a
boundary error which could possibly cause a heap-based buffer overflow.


Impact

A remote attacker could entice a user to open a specially crafted XML
file in an application linked against libxml2, possibly resulting in the
remote execution of arbitrary code with the permissions of the user
running the application, or Denial of Service.


Workaround

There is no known workaround at this time.

Resolution

All libxml2 users should upgrade to the latest version:
Code:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/libxml2-2.7.8-r4"
   
Packages which depend on this library may need to be recompiled. Tools
such as revdep-rebuild may assist in identifying some of these packages.


References

CVE-2011-3919
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