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Roundup: [oss-security] audiofile: divide-by-zero in BlockCodec::runPull (BlockCodec.cpp)
Here is a report from the oss-security mailing list for Vulnerability Roundup 27.
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Instructions:
Identification
Identify if we have the software, in 16.09, 17.03, and unstable. Then determine if we are vulnerable, and make a comment with your findings. It can also be helpful to specify if you think there is a patch, or if it can be fixed via a general update.
Example:
unstable: we are not vulnerable (link to the package)
17.03: we are vulnerable (link to the package)
16.09: we don't have it packaged
IMPORTANT: If you believe there are possibly related issues, bring them up on the parent issue!
Patching
Start by commenting on this issue saying you're working on a patch. This way, we don't duplicate work.
If you open a pull request, tag this issue and the master issue for the roundup.
If you commit the patch directly to a branch, please leave a comment on this issue with the branch and the commit hash, example:
fixed:
release-16.09: abc123
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Upon Completion ...
- [ ] Update Graham's database
Info
Triage Indicator:
-needs-triage +roundup27 thread:0000000000003e1c
- File Search: https://search.nix.gsc.io/?q=audiofile&i=fosho&repos=nixos-nixpkgs
- GitHub Search: https://github.com/NixOS/nixpkgs/search?utf8=%E2%9C%93&q=audiofile+in%3Apath&type=Code
Should the search term be changed from audiofile? Suggest a new package search by commenting:
-suggested:audiofile +suggested:correctPackageName thread:0000000000003e1c
Known CVEs: CVE-2017-6833
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Sun, 26 Feb 2017 11:53:42 +0000 "Agostino Sarubbo" <ago-at-gentoo.org>, 10347.2849327488-sendEmail@localhost
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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Mon, 13 Mar 2017 10:37:14 +0100 Agostino Sarubbo <ago-at-gentoo.org>, 4333819.x0OyyZu41M@blackgate
On Sunday 26 February 2017 11:53:42 Agostino Sarubbo wrote:
> Permalink:
> https://blogs.gentoo.org/ago/2017/02/20/audiofile-divide-by-zero-in-blockcod
> ecrunpull-blockcodec-cpp
This is CVE-2017-6833
--
Agostino Sarubbo
Gentoo Linux Developer
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