Arch Linux Security Advisory ASA-201611-2
========================================
Severity: Critical
Date    : 2016-11-01
CVE-ID  : CVE-2016-4658 CVE-2016-5131
Package : libxml2
Type    : arbitrary code execution
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package libxml2 before version 2.9.4+12+ge905f08-1 is vulnerable to
arbitrary code execution.

Resolution
=========
Upgrade to 2.9.4+12+ge905f08-1.

# pacman -Syu "libxml2>=2.9.4+12+ge905f08-1"

The problems have been fixed upstream but no release is available yet.

Workaround
=========
None.

Description
==========
- CVE-2016-4658 (arbitrary code execution)

A use-after-free vulnerability via namespace nodes in XPointer ranges
was found in libxml2.

- CVE-2016-5131 (arbitrary code execution)

Bugs in xmlXPathEvalExpr and xmlXPtrRangeToFunction can lead to a use-after-free and allow control of the instruction pointer.

Impact
=====
A remote attacker is able to use a specially crafted XPath payload to
execute arbitrary code.

References
=========
https://bugzilla.redhat.com/show_bug.cgi?id=1384424
https://gitlab.gnome.org/GNOME/libxml2/-/commit/c1d1f7121194036608bf555f08d3062a36fd344b
https://gitlab.gnome.org/GNOME/libxml2/-/commit/9ab01a277d71f54d3143c2cf333c5c2e9aaedd9e
https://bugs.chromium.org/p/chromium/issues/detail?id=623378
https://access.redhat.com/security/cve/CVE-2016-4658
https://access.redhat.com/security/cve/CVE-2016-5131