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Bug 1381933 - (CVE-2016-7953) CVE-2016-7953 libXvMC: Insufficient validation of server responses results in buffer underflow
CVE-2016-7953 libXvMC: Insufficient validation of server responses results in...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20160925,repor...
: Security
Depends On: 1381934
Blocks: 1381939
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Reported: 2016-10-05 07:43 EDT by Andrej Nemec
Modified: 2016-12-15 13:06 EST (History)
4 users (show)

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Fixed In Version: libXvMC 1.0.10
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Description Andrej Nemec 2016-10-05 07:43:13 EDT 
It was found that when receiving a response from the server protocol data is not validated sufficiently. If an empty string is received from an x-server, the buffer might underrun by accessing "rep.nameLen - 1" unconditionally, which could end up being -1.

Upstream patch:

https://cgit.freedesktop.org/xorg/lib/libXvMC/commit/?id=2cd95e7da8367cccdcdd5c9b160012d1dec5cbdb

External References:

https://lists.x.org/archives/xorg-announce/2016-October/002720.html

CVE assignment:

http://seclists.org/oss-sec/2016/q4/17
Comment 1 Andrej Nemec 2016-10-05 07:46:59 EDT 
Created libXvMC tracking bugs for this issue:

Affects: fedora-all [bug 1381934]
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