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Bug 626696 (CVE-2017-11548) - media-libs/libao:memory corruption vulnerability
Summary: media-libs/libao:memory corruption vulnerability
Alias: CVE-2017-11548
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B3 [ebuild cve]
Depends on:
Reported: 2017-07-31 13:04 UTC by Christopher Díaz Riveros (RETIRED)
Modified: 2020-06-23 04:50 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Christopher Díaz Riveros (RETIRED) gentoo-dev Security 2017-07-31 13:04:49 UTC
From URL:

Libao is a cross-platform audio library that allows programs to output audio using a simple API on a wide variety of 

Affected version:

Vulnerability Description:
the _tokenize_matrix function in audio_out.c in Xiph.Org libao 1.2.0 can cause a denial of service(memory corruption) 
via a crafted mp3 file.

I found this bug when I test mpg321 0.3.2 which used the libao library.

./mpg321 libao_1.2.0_memory_corruption.mp3

----debug info:----
Program received signal SIGSEGV, Segmentation fault.
_int_malloc (av=av@entry=0x7ffff6f7f760 <main_arena>, bytes=bytes@entry=3)
    at malloc.c:3740
3740malloc.c: No such file or directory.
(gdb) bt
#0  _int_malloc (av=av@entry=0x7ffff6f7f760 <main_arena>, bytes=bytes@entry=3)
    at malloc.c:3740
#1  0x00007ffff6c442cc in __libc_calloc (n=<optimized out>, 
    elem_size=<optimized out>) at malloc.c:3219
#2  0x00007ffff728e189 in _tokenize_matrix () from /usr/local/lib/
#3  0x00007ffff728e607 in _matrix_to_channelmask ()
   from /usr/local/lib/
#4  0x00007ffff72906f2 in _open_device () from /usr/local/lib/
#5  0x000000000040a6aa in open_ao_playdevice (header=header@entry=0x624af8)
    at ao.c:411
#6  0x0000000000407e50 in output (data=<optimized out>, header=0x624af8, 
    pcm=0x627f44) at mad.c:974
#7  0x00007ffff749a85c in run_sync (decoder=0x7fffffffbc40) at decoder.c:439
#8  0x00007ffff749ab38 in mad_decoder_run (
    mode=mode@entry=MAD_DECODER_MODE_SYNC) at decoder.c:557
#9  0x0000000000403d5d in main (argc=<optimized out>, argv=<optimized out>)
    at mpg321.c:1092
Comment 1 Yury German Gentoo Infrastructure gentoo-dev 2019-04-27 18:27:46 UTC
Maintainer(s), RedHat has addressed this bug with version #: libao-1.2.0-13.fc28
Our version in tree is Version: 1.2.2, please confirm if our current version has this fix in it.
Comment 2 John Helmert III (ajak) gentoo-dev Security 2020-06-23 04:50:36 UTC
I can't reproduce. Debian maintainer also isn't sure that this is actually an issue in libao.