Bug 1473204 (CVE-2017-10971) - CVE-2017-10971 xorg-x11-server: Stack overflow in the endianness conversion of X Events
Summary: CVE-2017-10971 xorg-x11-server: Stack overflow in the endianness conversion o...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2017-10971
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1473206 1910734
Blocks: 1473208
TreeView+ depends on / blocked
 
Reported: 2017-07-20 08:35 UTC by Andrej Nemec
Modified: 2022-04-17 20:52 UTC (History)
3 users (show)

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Last Closed: 2019-06-08 03:17:11 UTC
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Description Andrej Nemec 2017-07-20 08:35:59 UTC 
In the X.Org X server, a user authenticated to an X Session could crash or execute code in the context of the X Server by exploiting a stack overflow in the endianness conversion of X Events.

Upstream patches:

https://cgit.freedesktop.org/xorg/xserver/commit/?id=215f894965df5fb0bb45b107d84524e700d2073c
https://cgit.freedesktop.org/xorg/xserver/commit/?id=8caed4df36b1f802b4992edcfd282cbeeec35d9d
https://cgit.freedesktop.org/xorg/xserver/commit/?id=ba336b24052122b136486961c82deac76bbde455

References:

https://bugzilla.suse.com/show_bug.cgi?id=1035283
Comment 1 Andrej Nemec 2017-07-20 08:38:39 UTC 
Created xorg-x11-server tracking bugs for this issue:

Affects: fedora-all [bug 1473206]
Comment 2 Huzaifa S. Sidhpurwala 2017-08-16 07:17:09 UTC 
Since the Xorg server is compiled with Stack-smashing protection, it looks like executing arbitrary code in the context of the X-server (root) involves guessing the stack canary, which can be extremely difficult to pull, hence the maximum impact of this flaw is X-server crash.
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