Bug 1168684 – CVE-2014-8092 xorg-x11-server: integer overflow in X11 core protocol requests when calculating memory needs for requests

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Bug 1168684 - (CVE-2014-8092) CVE-2014-8092 xorg-x11-server: integer overflow in X11 core protocol requests when calculating memory needs for requests

Summary:	CVE-2014-8092 xorg-x11-server: integer overflow in X11 core protocol requests...

Status:	CLOSED ERRATA

Aliases:	CVE-2014-8092

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

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

URL:
Whiteboard:	impact=important,public=20141209,repo...
Keywords:	Security

Depends On:	1170916 1170917 1170918 1170919 1170932
Blocks:	1168310
	Show dependency tree / graph

Reported:	2014-11-27 10:23 EST by Vasyl Kaigorodov
Modified:	2014-12-12 03:34 EST (History)
CC List:	6 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	Multiple integer overflow flaws were found in the way the X.Org server calculated memory requirements for certain X11 core protocol requests. A malicious, authenticated client could use either of these flaws to crash the X.Org server or, potentially, execute arbitrary code with root privileges.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2014-12-11 15:56:13 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
0002-dix_integer_overflow_in_ProcPutImage_CVE-2014-8092_1-4.patch (1.29 KB, text/plain) 2014-11-27 10:24 EST, Vasyl Kaigorodov	no flags	Details
0003-dix_integer_overflow_in_GetHosts_CVE-2014-8092_2-4.patch (1.95 KB, text/plain) 2014-11-27 10:24 EST, Vasyl Kaigorodov	no flags	Details
0004-dix_integer_overflow_in_RegionSizeof_CVE-2014-8092_3-4.patch (4.38 KB, text/plain) 2014-11-27 10:24 EST, Vasyl Kaigorodov	no flags	Details
0005-dix_integer_overflow_in_REQUEST_FIXED_SIZE_CVE-2014-8092_4-4.patch (1.14 KB, text/plain) 2014-11-27 10:24 EST, Vasyl Kaigorodov	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2014:1982	normal	SHIPPED_LIVE	Important: xorg-x11-server security update	2014-12-11 17:34:45 EST
Red Hat Product Errata	RHSA-2014:1983	normal	SHIPPED_LIVE	Important: xorg-x11-server security update	2014-12-11 19:41:58 EST

Groups: None (edit)

Description Vasyl Kaigorodov 2014-11-27 10:23:03 EST

ProcPutImage(), GetHosts(), RegionSizeof(), REQUEST_FIXED_SIZE() calls do not check that their calculations for how much memory
is needed to handle the client's request have not overflowed, so can
result in out of bounds reads or writes.  These calls all occur only
after a client has successfully authenticated itself.

Introduced in X11R1 (1987).

Comment 1 Vasyl Kaigorodov 2014-11-27 10:24:35 EST

Created attachment 962113 [details]
0002-dix_integer_overflow_in_ProcPutImage_CVE-2014-8092_1-4.patch

Comment 2 Vasyl Kaigorodov 2014-11-27 10:24:38 EST

Created attachment 962114 [details]
0003-dix_integer_overflow_in_GetHosts_CVE-2014-8092_2-4.patch

Comment 3 Vasyl Kaigorodov 2014-11-27 10:24:46 EST

Created attachment 962115 [details]
0004-dix_integer_overflow_in_RegionSizeof_CVE-2014-8092_3-4.patch

Comment 4 Vasyl Kaigorodov 2014-11-27 10:24:48 EST

Created attachment 962116 [details]
0005-dix_integer_overflow_in_REQUEST_FIXED_SIZE_CVE-2014-8092_4-4.patch

Comment 5 Huzaifa S. Sidhpurwala 2014-12-05 00:32:04 EST

In all the patches above, some calculation is done on data sent by the client and it results in a 32-bit integer overflow. That integer is used to malloc memory and client-controlled data is then copied into it. 

In most of the cases it could result in arbitrary code execution as root, and in Xorg client/server step could result in privilege escalation.

Comment 8 Vincent Danen 2014-12-09 15:15:45 EST

External References:

http://www.x.org/wiki/Development/Security/Advisory-2014-12-09/

Comment 9 errata-xmlrpc 2014-12-11 12:35:02 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:1982 https://rhn.redhat.com/errata/RHSA-2014-1982.html

Comment 10 errata-xmlrpc 2014-12-11 14:42:16 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 6

Via RHSA-2014:1983 https://rhn.redhat.com/errata/RHSA-2014-1983.html

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