Arch Linux: ASA-201501-13 Critical Polarssl Remote Code Execution

Arch Linux Security Advisory ASA-201501-13
=========================================
Severity: Critical
Date    : 2015-01-20
CVE-ID  : CVE-2015-1182
Package : polarssl
Type    : remote code execution
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package polarssl before version 1.3.9-2 is vulnerable to remote code
execution.

Resolution
=========
Upgrade to 1.3.9-2.

# pacman -Syu "polarssl>=1.3.9-2"

The problem has not been fixed upstream yet.

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

Description
==========
During the parsing of a ASN.1 sequence, a pointer in the linked list of
asn1_sequence is not initialized by asn1_get_sequence_of(). In case an
error occurs during parsing of the list, a situation is created where
the uninitialized pointer is passed to polarssl_free().

This sequence can be triggered when a PolarSSL entity is parsing a
certificate. So practically this means clients when receiving a
certificate from the server or servers in case they are actively asking
for a client certificate.

Impact
=====
An attacker may be able to remotely execute arbitrary code on the
targeted system.

References
=========
https://bugs.archlinux.org/task/43508