Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Sun, 26 Feb 2017 11:55:03 +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::reset1 (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
==3538==ERROR: AddressSanitizer: FPE on unknown address 0x7f86a8cffe14 (pc 0x7f86a8cffe14 bp 0x7ffe41d2ae00 sp 0x7ffe41d2adf0 T0)                                                                                                                                              
    #0 0x7f86a8cffe13 in BlockCodec::reset1() /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/BlockCodec.cpp:74:61                                                                                                                        
    #1 0x7f86a8d0b794 in ModuleState::reset(_AFfilehandle*, Track*) /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/ModuleState.cpp:218:9                                                                                                 
    #2 0x7f86a8d0b794 in ModuleState::setup(_AFfilehandle*, Track*) /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/modules/ModuleState.cpp:190                                                                                                   
    #3 0x7f86a8ced43c in afGetFrameCount /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/libaudiofile/format.cpp:205:41                                                                                                                                        
    #4 0x50bb5c in copyaudiodata /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:329:29                                                                                                                                                 
    #5 0x50b050 in main /tmp/portage/media-libs/audiofile-0.3.6-r1/work/audiofile-0.3.6/sfcommands/sfconvert.c:248:17                                                                                                                                                          
    #6 0x7f86a7dbe78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289                                                                                                                                                     
    #7 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:74:61 in BlockCodec::reset1()                                                                                                               
==3538==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/00189-audiofile-fpe-BlockCodec-reset1

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-blockcodecreset1-blockcodec-cpp

--
Agostino Sarubbo
Gentoo Linux Developer


Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.