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Date: Sun, 26 Feb 2017 11:53:42 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: audiofile: divide-by-zero in BlockCodec::runPull (BlockCodec.cpp)
Description:
audiofile is a C-based library for reading and writing audio files in many common formats.
A fuzz on it discovered a division by zero.
The complete ASan output:
# sfconvert @@ out.mp3 format aiff
==2529==ERROR: AddressSanitizer: FPE on unknown address 0x7ff06b121920 (pc 0x7ff06b121920 bp 0x7ffd0ddf2d90 sp 0x7ffd0ddf2d00 T0)
#0 0x7ff06b12191f in BlockCodec::runPull() /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/BlockCodec.cpp:50:46
#1 0x7ff06b15ac20 in RebufferModule::runPull() /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/RebufferModule.cpp:122:3
#2 0x7ff06b10b05a in afReadFrames /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/data.cpp:222:14
#3 0x50bbeb in copyaudiodata /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:340:29
#4 0x50b050 in main /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:248:17
#5 0x7ff06a1e078f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#6 0x419f48 in _init (/usr/bin/sfconvert+0x419f48)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: FPE /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/BlockCodec.cpp:50:46 in BlockCodec::runPull()
==2529==ABORTING
Affected version:
0.3.6
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00187-audiofile-fpe-BlockCodec-runPull
Timeline:
2017-02-20: bug discovered and reported to upstream
2017-02-20: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/02/20/audiofile-divide-by-zero-in-blockcodecrunpull-blockcodec-cpp
--
Agostino Sarubbo
Gentoo Linux Developer
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