Bug 1500387 (CVE-2017-13721) - CVE-2017-13721 xorg-x11-server: Insufficient validation of shmseg resource id
Summary: CVE-2017-13721 xorg-x11-server: Insufficient validation of shmseg resource id
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2017-13721
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1500389 1910731
Blocks: 1500390
TreeView+ depends on / blocked
 
Reported: 2017-10-10 13:25 UTC by Andrej Nemec
Modified: 2022-04-17 20:53 UTC (History)
13 users (show)

Fixed In Version: xorg-x11-server 1.19.4
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Last Closed: 2017-11-01 05:12:19 UTC
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Description Andrej Nemec 2017-10-10 13:25:47 UTC 
In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.

References:

http://www.openwall.com/lists/oss-security/2017/10/04/10
https://lists.x.org/archives/xorg-announce/2017-October/002808.html

Upstream patch:

https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1
Comment 1 Andrej Nemec 2017-10-10 13:29:12 UTC 
Created xorg-x11-server tracking bugs for this issue:

Affects: fedora-all [bug 1500389]
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