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List: oss-security
Subject: [oss-security] audiofile: global buffer overflow in decodeSample (IMA.cpp)
From: "Agostino Sarubbo" <ago () gentoo ! org>
Date: 2017-02-26 11:49:46
Message-ID: 278043.289060832-sendEmail () localhost
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Description:
audiofile is a C-based library for reading and writing audio files in many common formats.
A fuzz on it discovered a global overflow.
The complete ASan output:
# sfconvert @@ out.mp3 format aiff \
==1779==ERROR: AddressSanitizer: global-buffer-overflow on address 0x7f0add7e6a7a at pc \
0x7f0add77c221 bp 0x7ffe13caabf0 sp 0x7ffe13caabe8 READ of size 2 at 0x7f0add7e6a7a thread T0
#0 0x7f0add77c220 in decodeSample(adpcmState&, unsigned char) \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:144:13
#1 0x7f0add77c220 in IMA::decodeBlockWAVE(unsigned char const*, short*) \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:186
#2 0x7f0add77b671 in IMA::decodeBlock(unsigned char const*, short*) \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:110:10
#3 0x7f0add777ac9 in BlockCodec::runPull() \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/BlockCodec.cpp:55:3
#4 0x7f0add7b0c20 in RebufferModule::runPull() \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/RebufferModule.cpp:122:3
#5 0x7f0add76105a in afReadFrames \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/data.cpp:222:14 \
#6 0x50bbeb in copyaudiodata \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:340:29 \
#7 0x50b050 in main /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:248:17
#8 0x7f0adc83678f in __libc_start_main \
/tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289 #9 0x419f48 in \
_init (/usr/bin/sfconvert+0x419f48)
0x7f0add7e6a7a is located 6 bytes to the left of global variable 'indexTable' defined in
'/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:116:21' \
(0x7f0add7e6a80) of size 16 0x7f0add7e6a7a is located 40 bytes to the right of global variable \
'stepTable' defined in \
'/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:122:22' \
(0x7f0add7e69a0) of size 178
SUMMARY: AddressSanitizer: global-buffer-overflow \
/tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/IMA.cpp:144:13 \
in decodeSample(adpcmState&, unsigned char)
Shadow bytes around the buggy address:
0x0fe1dbaf4cf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe1dbaf4d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 07 f9 f9
0x0fe1dbaf4d10: f9 f9 f9 f9 00 00 00 00 00 00 00 04 f9 f9 f9 f9
0x0fe1dbaf4d20: 00 00 00 00 00 00 01 f9 f9 f9 f9 f9 00 00 01 f9
0x0fe1dbaf4d30: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0fe1dbaf4d40: 00 00 00 00 00 00 00 00 00 00 02 f9 f9 f9 f9[f9]
0x0fe1dbaf4d50: 00 00 f9 f9 f9 f9 f9 f9 00 00 03 f9 f9 f9 f9 f9
0x0fe1dbaf4d60: 00 00 05 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
0x0fe1dbaf4d70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe1dbaf4d80: 00 00 00 00 01 f9 f9 f9 f9 f9 f9 f9 00 00 00 00
0x0fe1dbaf4d90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==1779==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/00183-audiofile-globaloverflow-decodeSample
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-global-buffer-overflow-in-decodesample-ima-cpp
--
Agostino Sarubbo
Gentoo Linux Developer
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