Arch Linux Security Advisory ASA-201606-13
=========================================
Severity: Medium
Date    : 2016-06-13
CVE-ID  : CVE-2012-6702 CVE-2016-5300
Package : expat
Type    : multiple issues
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package 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 "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