Bug 1500388 – CVE-2017-13723 xorg-x11-server: Global buffer overflow in xkbtext.c

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Bug 1500388 - (CVE-2017-13723) CVE-2017-13723 xorg-x11-server: Global buffer overflow in xkbtext.c

Summary:	CVE-2017-13723 xorg-x11-server: Global buffer overflow in xkbtext.c

Status:	CLOSED WONTFIX

Aliases:	CVE-2017-13723

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20171004,reported=2...
Keywords:	Security

Depends On:	1500389
Blocks:	1500390
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Reported:	2017-10-10 09:28 EDT by Andrej Nemec
Modified:	2017-11-01 01:15 EDT (History)
CC List:	13 users (show)

See Also:
Fixed In Version:	xorg-x11-server 1.19.4
Doc Type:	If docs needed, set a value
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Environment:
Last Closed:	2017-11-01 01:12:44 EDT
Type:	---
Regression:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2017-10-10 09:28:18 EDT

In X.Org Server (aka xserver and xorg-server) before 1.19.4, a local attacker authenticated to the X server could overflow a global buffer, causing crashes of the X server or potentially other problems by injecting large or malformed XKB related atoms and accessing them via xkbcomp.

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=94f11ca5cf011ef123bd222cabeaef6f424d76ac

Comment 1 Andrej Nemec 2017-10-10 09:29:01 EDT

Created xorg-x11-server tracking bugs for this issue:

Affects: fedora-all [bug 1500389]

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