[ASA-201810-3] libxml2: denial of service

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201810-3
=========================================

Severity: Medium
Date    : 2018-10-01
CVE-ID  : CVE-2018-9251
Package : libxml2
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-672

Summary
=======

The package libxml2 before version 2.9.8-5 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 2.9.8-5.

# pacman -Syu "libxml2>=2.9.8-5"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

None.

Description
===========

A security issue has been found in libxml2 <= 2.9.8 compiled with LZMA
support enabled, in the xz_decomp function in xzlib.c. This flaw allows
a remote attacker to cause a denial of service via an infinite loop,
using a crafted XML payload that triggers LZMA_MEMLIMIT_ERROR.

Impact
======

A remote attacker is able to cause a denial of service by parsing a
specially crafted XML payload.

References
==========

https://bugzilla.gnome.org/show_bug.cgi?id=794914
https://gitlab.gnome.org/GNOME/libxml2/commit/2240fbf5912054af025fb6e01e26375100275e74
https://security.archlinux.org/CVE-2018-9251
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