Bug 501562 (CVE-2009-1756)

Summary:	CVE-2009-1756 SLiM: Potential X session hijacking (MITM)
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	afb, lorenzo
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
URL:	http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529306
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-01-20 12:14:09 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:	544024
Bug Blocks:

Description Jan Lieskovsky 2009-05-19 18:34:05 UTC

Potential man-in-the-middle attack was found in SLiM (Simple Login Manager)
due to improper processing of authorization information used in connection
to the X server. A local attacker could use this flaw to hijack X session
of the victim by overhearing of certain information, needed for proper
extraction of authorization records.

References:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529306
http://bugs.gentoo.org/show_bug.cgi?id=270345
http://www.openwall.com/lists/oss-security/2009/05/18/2

Comment 1 Jan Lieskovsky 2009-05-22 10:53:07 UTC

CVE-2009-1756:

SLiM Simple Login Manager 1.3.0 includes places the X authority magic
cookie (mcookie) on the command line when invoking xauth from (1)
app.cpp and (2) switchuser.cpp, which allows local users to access the
X session by listing the process and its arguments. 

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1756
http://www.openwall.com/lists/oss-security/2009/05/18/2
http://www.securityfocus.com/bid/35015
http://osvdb.org/54583
http://secunia.com/advisories/35132
http://xforce.iss.net/xforce/xfdb/50611

Comment 2 Jan Lieskovsky 2009-08-20 10:37:20 UTC

This issue affects the versions of the slim package, as shipped with
Fedora releases of 10 and 11.

Please fix.

Comment 3 Anders F Björklund 2009-08-20 10:56:29 UTC

I'm not interested in maintaining slim for Fedora 10 and 11 (it's an orphan), but if the debian patch applies cleanly I can try to add that to a testing package ?

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529306#25 {CVE-2009-1756}
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529306#35 (rand -> random)

Comment 6 Fedora Update System 2009-12-22 00:18:45 UTC

slim-1.3.1-9.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/slim-1.3.1-9.fc12

Comment 7 Fedora Update System 2009-12-22 00:18:49 UTC

slim-1.3.1-9.fc11 has been submitted as an update for Fedora 11.
http://admin.fedoraproject.org/updates/slim-1.3.1-9.fc11

Comment 8 Fedora Update System 2010-01-02 03:27:13 UTC

slim-1.3.1-9.fc11 has been pushed to the Fedora 11 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2010-01-02 03:28:36 UTC

slim-1.3.1-9.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.