[arch-security] [ASA-201606-14] lib32-expat: multiple issues

[Levente Polyak]

Arch Linux Security Advisory ASA-201606-14
==========================================

Severity: Medium
Date    : 2016-06-13
CVE-ID  : CVE-2012-6702 CVE-2016-5300
Package : lib32-expat
Type    : multiple issues
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package lib32-expat before version 2.1.1-3 is vulnerable to
multiple issues including predictable random numbers and insufficient
hash entropy leading to denial of service.

Resolution
==========

Upgrade to 2.1.1-3.

# pacman -Syu "lib32-expat>=2.1.1-3"

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

Workaround
==========

None.

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

- CVE-2012-6702 (predictable random numbers)

It was found that when calling XML_Parse ahead of rand(), it causes the
pseudo random generator to generate non-random predictable numbers.

- CVE-2016-5300 (denial of service)

It was found that original fix for CVE-2012-0876 used too little
entropy for the hash initialization. This issue can be used to perform
a hash collision based denial of service attack.

Impact
======

A remote attacker is able to predict random numbers from the PRNG or
perform a hash based collision attack resulting in denial of service.

References
==========

https://access.redhat.com/security/cve/CVE-2012-6702
https://access.redhat.com/security/cve/CVE-2016-5300

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