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Bug 1381859 - (CVE-2016-7942) CVE-2016-7942 libX11: Insufficient validation of server responses in XGetImage()
CVE-2016-7942 libX11: Insufficient validation of server responses in XGetImage()
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20160925,reported=2...
: Security
Depends On: 1381863
Blocks: 1381939
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Reported: 2016-10-05 04:36 EDT by Andrej Nemec
Modified: 2016-12-15 13:07 EST (History)
4 users (show)

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Fixed In Version: libX11 1.6.4
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Description Andrej Nemec 2016-10-05 04:36:49 EDT 
It was found that when receiving a response from the server protocol data is not validated sufficiently. A check is needed if enough bytes were received for specified image type and geometry. Otherwise GetPixel and other functions could trigger an out of boundary read.

Upstream patch:

https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8ea762f94f4c942d898fdeb590a1630c83235c17

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 04:40:24 EDT 
Created libX11 tracking bugs for this issue:

Affects: fedora-all [bug 1381863]
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