Scientific Linux Security Update : libxml2 on SL6.x i386/x86_64

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Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

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.

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)

An integer overflow flaw, leading to a heap-based buffer overflow, 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 or, possibly, execute arbitrary code.
(CVE-2011-1944)

Multiple flaws were 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-2010-4008, CVE-2010-4494,
CVE-2011-2821, CVE-2011-2834)

Note: Scientific Linux generally does not ship any applications that
use libxml2 in a way that would allow the CVE-2011-1944,
CVE-2010-4008, CVE-2010-4494, CVE-2011-2821, and CVE-2011-2834 flaws
to be exploited
however, third-party applications may allow XPath
expressions to be passed which could trigger these flaws.

This update also fixes the following bugs :

- A number of patches have been applied to harden the
XPath processing code in libxml2, such as fixing memory
leaks, rounding errors, XPath numbers evaluations, and a
potential error in encoding conversion.

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.

See also :

http://www.nessus.org/u?c7897f67

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 61192 ()

Bugtraq ID:

CVE ID: CVE-2010-4008
CVE-2010-4494
CVE-2011-0216
CVE-2011-1944
CVE-2011-2821
CVE-2011-2834