Bug 745755 (CVE-2011-4028)

Summary: CVE-2011-4028 xorg-x11-server: File existence disclosure vulnerability
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: ajax, security-response-team, vdanen, xgl-maint
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-06-20 10:22:49 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: 768993, 799349, 807122    
Bug Blocks: 742493, 745043, 784298    
Attachments:
Description Flags
Proposed X.Org X11 server upstream patch none

Description Jan Lieskovsky 2011-10-13 10:09:20 UTC 
A file existence disclosure flaw was found in the way X.Org X11 X server performed management of temporary lock files. A local, unprivileged user could use this flaw to confirm (non) existence of a file system object (file, directory or fifo), which shouldn't be accessible for them, via symbolic link attacks, with link name being the expected name of the X.Org X11 X server temporary lock file.

Note:
For the exploit to succeed the local attacker needs to be able to run the X.Org X11 X server.
Comment 1 Jan Lieskovsky 2011-10-13 10:12:01 UTC 
Acknowledgements:

Red Hat would like to thank researcher with a nickname vladz for reporting this issue.
Comment 5 Jan Lieskovsky 2011-10-18 10:55:10 UTC 
Created attachment 528780 [details]
Proposed X.Org X11 server upstream patch
Comment 6 Vincent Danen 2011-10-18 16:42:24 UTC 
This issue is now public.  The following commit corrects the problem upstream:

http://cgit.freedesktop.org/xorg/xserver/commit/?id=6ba44b91e37622ef8c146d8f2ac92d708a18ed34


External References:

http://lists.freedesktop.org/archives/xorg-announce/2011-October/001744.html
Comment 7 Vincent Danen 2011-10-18 16:45:24 UTC 
Statement:

(none)
Comment 10 errata-xmlrpc 2012-02-21 03:12:34 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:0303 https://rhn.redhat.com/errata/RHSA-2012-0303.html
Comment 12 Jan Lieskovsky 2012-03-02 14:49:37 UTC 
This issue affects the current version (xorg-x11-server-Xorg-1.10.4-1.fc15.*) of the xorg-x11-server package, as shipped with Fedora release of 15. Please schedule an update.

--

This issue does NOT affect the current version (xorg-x11-server-Xorg-1.11.4-1.fc16) of the xorg-x11-server package, as shipped with Fedora release of 16. The deficiency in this version is corrected already.
Comment 13 Jan Lieskovsky 2012-03-02 15:07:33 UTC 
Created xorg-x11-server tracking bugs for this issue

Affects: fedora-15 [bug 799349]
Comment 15 errata-xmlrpc 2012-06-20 07:27:24 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0939 https://rhn.redhat.com/errata/RHSA-2012-0939.html