GLSA 201702-21: Opus: User-assisted execution of arbitrary code
| Severity: | normal |
| Title: | Opus: User-assisted execution of arbitrary code |
| Date: | 02/20/2017 |
| Bugs: | |
| ID: | 201702-21 |
Synopsis
A vulnerability in Opus could cause memory corruption.Background
Opus is a totally open, royalty-free, highly versatile audio codec.
Affected packages
| Package | Vulnerable | Unaffected | Architecture(s) |
|---|---|---|---|
| media-libs/opus | < 1.1.3-r1 | >= 1.1.3-r1 | All supported architectures |
Description
A large NLSF values could cause the stabilization code in silk/NLSF_stabilize.c to wrap-around and have the last value in NLSF_Q15[] to be negative, close to -32768.
Under normal circumstances, the code will simply read from the wrong table resulting in an unstable LPC filter. The filter would then go through the LPC stabilization code at the end of silk_NLSF2A().
Ultimately, the output audio would be garbage, but no worse than with any other harmless bad packet.
Please see the referenced upstream patch and Debian bug report below for a detailed analysis.
However, the original report was about a successful exploitation of Android’s Mediaserver in conjunction with this vulnerability.
Impact
A remote attacker could entice a user to open a specially crafted media stream, possibly resulting in execution of arbitrary code with the privileges of the process, or a Denial of Service condition.
Workaround
There is no known workaround at this time.
Resolution
All Opus users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/opus-1.1.3-r1"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.