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TITLE:
LightDM "xsession_setup()" Privilege Escalation Security Issue

SECUNIA ADVISORY ID:
SA46712

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46712/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46712

RELEASE DATE:
2011-11-03

DISCUSS ADVISORY:
http://secunia.com/advisories/46712/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/46712/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=46712

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A security issue has been reported in LightDM, which can be exploited
by malicious, local users to perform certain actions with escalated
privileges.

The security issue is caused due to the "xsession_setup()" function
(src/xsession.c) incorrectly changing the ownership of the
"~/.Xauthority" file, which can be exploited to change the ownership
of arbitrary files via symlink attacks.

The security issue is reported in versions 1.0.4 and 1.0.5.

SOLUTION:
Update to version 1.0.6.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://lists.freedesktop.org/archives/lightdm/2011-November/000178.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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