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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: libxml2 security update
Advisory ID:       RHSA-2012:0016-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-0016.html
Issue date:        2012-01-11
CVE Names:         CVE-2011-0216 CVE-2011-2834 CVE-2011-3905 
                   CVE-2011-3919 
=====================================================================

1. Summary:

Updated libxml2 packages that fix several security issues are now available
for Red Hat Enterprise Linux 4.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Description:

The libxml2 library is a development toolbox providing the implementation
of various XML standards. One of those standards is the XML Path Language
(XPath), which is a language for addressing parts of an XML document.

A heap-based buffer overflow flaw was found in the way libxml2 decoded
entity references with long names. A remote attacker could provide a
specially-crafted XML file that, when opened in an application linked
against libxml2, would cause the application to crash or, potentially,
execute arbitrary code with the privileges of the user running the
application. (CVE-2011-3919)

An off-by-one error, leading to a heap-based buffer overflow, was found in
the way libxml2 parsed certain XML files. A remote attacker could provide a
specially-crafted XML file that, when opened in an application linked
against libxml2, would cause the application to crash or, potentially,
execute arbitrary code with the privileges of the user running the
application. (CVE-2011-0216)

A flaw was found in the way libxml2 parsed certain XPath expressions. If an
attacker were able to supply a specially-crafted XML file to an application
using libxml2, as well as an XPath expression for that application to run
against the crafted file, it could cause the application to crash.
(CVE-2011-2834)

Note: Red Hat does not ship any applications that use libxml2 in a way that
would allow the CVE-2011-2834 flaw to be exploited; however, third-party
applications may allow XPath expressions to be passed which could trigger
this flaw.

An out-of-bounds memory read flaw was found in libxml2. A remote attacker
could provide a specially-crafted XML file that, when opened in an
application linked against libxml2, would cause the application to crash.
(CVE-2011-3905)

All users of libxml2 are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. The desktop must
be restarted (log out, then log back in) for this update to take effect.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

724906 - CVE-2011-0216 libxml2: Off-by-one error leading to heap-based buffer overflow in encoding
735751 - CVE-2011-2834 libxml2: double-free caused by malformed XPath expression in XSLT
767387 - CVE-2011-3905 libxml2 out of bounds read
771896 - CVE-2011-3919 libxml2: Heap-based buffer overflow when decoding an entity reference with a long name

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/libxml2-2.6.16-12.9.src.rpm

i386:
libxml2-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-devel-2.6.16-12.9.i386.rpm
libxml2-python-2.6.16-12.9.i386.rpm

ia64:
libxml2-2.6.16-12.9.i386.rpm
libxml2-2.6.16-12.9.ia64.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.ia64.rpm
libxml2-devel-2.6.16-12.9.ia64.rpm
libxml2-python-2.6.16-12.9.ia64.rpm

ppc:
libxml2-2.6.16-12.9.ppc.rpm
libxml2-2.6.16-12.9.ppc64.rpm
libxml2-debuginfo-2.6.16-12.9.ppc.rpm
libxml2-debuginfo-2.6.16-12.9.ppc64.rpm
libxml2-devel-2.6.16-12.9.ppc.rpm
libxml2-python-2.6.16-12.9.ppc.rpm

s390:
libxml2-2.6.16-12.9.s390.rpm
libxml2-debuginfo-2.6.16-12.9.s390.rpm
libxml2-devel-2.6.16-12.9.s390.rpm
libxml2-python-2.6.16-12.9.s390.rpm

s390x:
libxml2-2.6.16-12.9.s390.rpm
libxml2-2.6.16-12.9.s390x.rpm
libxml2-debuginfo-2.6.16-12.9.s390.rpm
libxml2-debuginfo-2.6.16-12.9.s390x.rpm
libxml2-devel-2.6.16-12.9.s390x.rpm
libxml2-python-2.6.16-12.9.s390x.rpm

x86_64:
libxml2-2.6.16-12.9.i386.rpm
libxml2-2.6.16-12.9.x86_64.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.x86_64.rpm
libxml2-devel-2.6.16-12.9.x86_64.rpm
libxml2-python-2.6.16-12.9.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/libxml2-2.6.16-12.9.src.rpm

i386:
libxml2-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-devel-2.6.16-12.9.i386.rpm
libxml2-python-2.6.16-12.9.i386.rpm

x86_64:
libxml2-2.6.16-12.9.i386.rpm
libxml2-2.6.16-12.9.x86_64.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.x86_64.rpm
libxml2-devel-2.6.16-12.9.x86_64.rpm
libxml2-python-2.6.16-12.9.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/libxml2-2.6.16-12.9.src.rpm

i386:
libxml2-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-devel-2.6.16-12.9.i386.rpm
libxml2-python-2.6.16-12.9.i386.rpm

ia64:
libxml2-2.6.16-12.9.i386.rpm
libxml2-2.6.16-12.9.ia64.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.ia64.rpm
libxml2-devel-2.6.16-12.9.ia64.rpm
libxml2-python-2.6.16-12.9.ia64.rpm

x86_64:
libxml2-2.6.16-12.9.i386.rpm
libxml2-2.6.16-12.9.x86_64.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.x86_64.rpm
libxml2-devel-2.6.16-12.9.x86_64.rpm
libxml2-python-2.6.16-12.9.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/libxml2-2.6.16-12.9.src.rpm

i386:
libxml2-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-devel-2.6.16-12.9.i386.rpm
libxml2-python-2.6.16-12.9.i386.rpm

ia64:
libxml2-2.6.16-12.9.i386.rpm
libxml2-2.6.16-12.9.ia64.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.ia64.rpm
libxml2-devel-2.6.16-12.9.ia64.rpm
libxml2-python-2.6.16-12.9.ia64.rpm

x86_64:
libxml2-2.6.16-12.9.i386.rpm
libxml2-2.6.16-12.9.x86_64.rpm
libxml2-debuginfo-2.6.16-12.9.i386.rpm
libxml2-debuginfo-2.6.16-12.9.x86_64.rpm
libxml2-devel-2.6.16-12.9.x86_64.rpm
libxml2-python-2.6.16-12.9.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-0216.html
https://www.redhat.com/security/data/cve/CVE-2011-2834.html
https://www.redhat.com/security/data/cve/CVE-2011-3905.html
https://www.redhat.com/security/data/cve/CVE-2011-3919.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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