Bug 1473204 (CVE-2017-10971)

Summary:	CVE-2017-10971 xorg-x11-server: Stack overflow in the endianness conversion of X Events
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ajax, ofourdan, xgl-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:17:11 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1473206, 1910734
Bug Blocks:	1473208

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.