| 1 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 2 |
Gentoo Linux Security Advisory GLSA 201702-21 |
| 3 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 4 |
https://security.gentoo.org/ |
| 5 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 6 |
|
| 7 |
Severity: Normal |
| 8 |
Title: Opus: User-assisted execution of arbitrary code |
| 9 |
Date: February 20, 2017 |
| 10 |
Bugs: #605894 |
| 11 |
ID: 201702-21 |
| 12 |
|
| 13 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 14 |
|
| 15 |
Synopsis |
| 16 |
======== |
| 17 |
|
| 18 |
A vulnerability in Opus could cause memory corruption. |
| 19 |
|
| 20 |
Background |
| 21 |
========== |
| 22 |
|
| 23 |
Opus is a totally open, royalty-free, highly versatile audio codec. |
| 24 |
|
| 25 |
Affected packages |
| 26 |
================= |
| 27 |
|
| 28 |
------------------------------------------------------------------- |
| 29 |
Package / Vulnerable / Unaffected |
| 30 |
------------------------------------------------------------------- |
| 31 |
1 media-libs/opus < 1.1.3-r1 >= 1.1.3-r1 |
| 32 |
|
| 33 |
Description |
| 34 |
=========== |
| 35 |
|
| 36 |
A large NLSF values could cause the stabilization code in |
| 37 |
silk/NLSF_stabilize.c to wrap-around and have the last value in |
| 38 |
NLSF_Q15[] to be negative, close to -32768. |
| 39 |
|
| 40 |
Under normal circumstances, the code will simply read from the wrong |
| 41 |
table resulting in an unstable LPC filter. The filter would then go |
| 42 |
through the LPC stabilization code at the end of silk_NLSF2A(). |
| 43 |
|
| 44 |
Ultimately, the output audio would be garbage, but no worse than with |
| 45 |
any other harmless bad packet. |
| 46 |
|
| 47 |
Please see the referenced upstream patch and Debian bug report below |
| 48 |
for a detailed analysis. |
| 49 |
|
| 50 |
However, the original report was about a successful exploitation of |
| 51 |
Android's Mediaserver in conjunction with this vulnerability. |
| 52 |
|
| 53 |
Impact |
| 54 |
====== |
| 55 |
|
| 56 |
A remote attacker could entice a user to open a specially crafted media |
| 57 |
stream, possibly resulting in execution of arbitrary code with the |
| 58 |
privileges of the process, or a Denial of Service condition. |
| 59 |
|
| 60 |
Workaround |
| 61 |
========== |
| 62 |
|
| 63 |
There is no known workaround at this time. |
| 64 |
|
| 65 |
Resolution |
| 66 |
========== |
| 67 |
|
| 68 |
All Opus users should upgrade to the latest version: |
| 69 |
|
| 70 |
# emerge --sync |
| 71 |
# emerge --ask --oneshot --verbose ">=media-libs/opus-1.1.3-r1" |
| 72 |
|
| 73 |
References |
| 74 |
========== |
| 75 |
|
| 76 |
[ 1 ] CVE-2017-0381 |
| 77 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-0381 |
| 78 |
[ 2 ] Debian Bug 851612 |
| 79 |
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851612#10 |
| 80 |
[ 3 ] Upstream patch |
| 81 |
https://git.xiph.org/?p=opus.git;a=commitdiff;h=70a3d641b |
| 82 |
|
| 83 |
Availability |
| 84 |
============ |
| 85 |
|
| 86 |
This GLSA and any updates to it are available for viewing at |
| 87 |
the Gentoo Security Website: |
| 88 |
|
| 89 |
https://security.gentoo.org/glsa/201702-21 |
| 90 |
|
| 91 |
Concerns? |
| 92 |
========= |
| 93 |
|
| 94 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 95 |
confidentiality and security of our users' machines is of utmost |
| 96 |
importance to us. Any security concerns should be addressed to |
| 97 |
security@g.o or alternatively, you may file a bug at |
| 98 |
https://bugs.gentoo.org. |
| 99 |
|
| 100 |
License |
| 101 |
======= |
| 102 |
|
| 103 |
Copyright 2017 Gentoo Foundation, Inc; referenced text |
| 104 |
belongs to its owner(s). |
| 105 |
|
| 106 |
The contents of this document are licensed under the |
| 107 |
Creative Commons - Attribution / Share Alike license. |
| 108 |
|
| 109 |
http://creativecommons.org/licenses/by-sa/2.5 |
Archives