Subject: [ASA-201708-10] libytnef: arbitrary code execution

Arch Linux Security Advisory ASA-201708-10
==========================================

Severity: High
Date    : 2017-08-14
CVE-ID  : CVE-2017-9058
Package : libytnef
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-275

Summary
=======

The package libytnef before version 1.9.2-2 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 1.9.2-2.

# pacman -Syu "libytnef>=1.9.2-2"

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

Workaround
==========

None.

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

A heap-buffer-overflow vulnerability has been found in the libytnef in
the lib/ytnef.c module.

Impact
======

A remote attacker can execute arbitrary code on the affected host via a
crafted tnef file.

References
==========

https://github.com/bingosxs/fuzzdata/blob/master/ytnef-1.9/TNEFFreeMapiProps-Invalid-read.tnef?raw=true
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=862556
https://security.archlinux.org/CVE-2017-9058