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Background
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Vorbis tools is a package containing tools to use, manipulate and create
Vorbis files.

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Software Version
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All tests were performed using vorbis-tools latest svn (Revision: 19440)

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Description
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During a fuzzing session (using afl-fuzzer) two issues were discovered
in oggenc tool of vorbis-tools :

* a division by zero bug
* an integer overflow leading to out-of-bounds memory read


Both issues are triggered by the number of channels in the input WAV file.

More info can be found at :

https://trac.xiph.org/ticket/2137 (division by zero)
https://trac.xiph.org/ticket/2136 (integer overflow)


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Timeline
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2014-12-29 Issue reported to xiph.org bug tracker
2014-01-18 No response, public disclosure

-- 
Paris Zoumpouloglou
@pzmini0n

https://projectzero.gr