Arch Linux: 201601-17 Medium Severity Info Leak in ffmpeg Remote Threat

Arch Linux Security Advisory ASA-201601-17
=========================================
Severity: Medium
Date    : 2016-01-17
CVE-ID  : CVE-2016-1897 CVE-2016-1898
Package : ffmpeg
Type    : information leakage
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package ffmpeg before version 1:2.8.4-3 is vulnerable to information
leakage.

Resolution
=========
Upgrade to 1:2.8.4-3.

# pacman -Syu "ffmpeg>=1:2.8.4-3"

The problem has been fixed upstream in version 2.8.5.

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

Description
==========
A vulnerability in the way FFmpeg handles the concat (CVE-2016-1897) and
subfile (CVE-2016-1898) protocols in a HTTP Live Streaming (HLS) M3U8
file allows a remote attacker to conduct a cross-origin attacks, and to
access arbitrary local files on the vulnerable host. The attack uses a
crafted M3U8 file to make FFmpeg send a HTTP request to an external
server, with the URL containing data from arbitrary local files.

Impact
=====
A remote attacker, by providing a crafted M3U8 file, can access the
content of arbitrary local files on the affected host.

References
=========
https://bugs.archlinux.org/task/47738
https://seclists.org/oss-sec/2016/q1/85
https://security-tracker.debian.org/tracker/CVE-2016-1897
https://security-tracker.debian.org/tracker/CVE-2016-1898