(RHSA-2013:0217) Important: mingw32-libxml2 security update

These packages provide the libxml2 library, a development toolbox providing
the implementation of various XML standards, for users of MinGW (Minimalist
GNU for Windows).

IMPORTANT NOTE: The mingw32 packages in Red Hat Enterprise Linux 6 will no
longer be updated proactively and will be deprecated with the release of
Red Hat Enterprise Linux 6.4. These packages were provided to support other
capabilities in Red Hat Enterprise Linux and were not intended for direct
customer use. Customers are advised to not use these packages with
immediate effect. Future updates to these packages will be at Red Hat’s
discretion and these packages may be removed in a future minor release.

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)

A heap-based buffer underflow flaw was found in the way libxml2 decoded
certain entities. 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-2012-5134)

It was found that the hashing routine used by libxml2 arrays was
susceptible to predictable hash collisions. Sending a specially-crafted
message to an XML service could result in longer processing time, which
could lead to a denial of service. To mitigate this issue, randomization
has been added to the hashing function to reduce the chance of an attacker
successfully causing intentional collisions. (CVE-2012-0841)

Multiple flaws were found in the way libxml2 parsed certain XPath (XML Path
Language) 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)

Two heap-based buffer overflow flaws were found in the way libxml2 decoded
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,
CVE-2011-3102)

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)

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)

Red Hat would like to thank the Google Security Team for reporting the
CVE-2010-4008 issue. Upstream acknowledges Bui Quang Minh from Bkis as the
original reporter of CVE-2010-4008.

All users of mingw32-libxml2 are advised to upgrade to these updated
packages, which contain backported patches to correct these issues.