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TITLE:
LightDM  "~/.dmrc" and "~/.Xauthority" Privilege Escalation Security
Issue

SECUNIA ADVISORY ID:
SA46655

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46655/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46655

RELEASE DATE:
2011-11-03

DISCUSS ADVISORY:
http://secunia.com/advisories/46655/#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/46655/

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=46655

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 LightDM writing e.g. the
"~/.dmrc" and "~/.Xauthority" files as root user, which can be
exploited to e.g. overwrite arbitrary files via symlink attacks.

The security issue is reported in versions prior to 0.9.6.

SOLUTION:
Update to version 0.9.6.

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

PROVIDED AND/OR DISCOVERED BY:
Sebastian Krahmer

ORIGINAL ADVISORY:
http://lists.freedesktop.org/archives/lightdm/2011-September/000127.html
http://www.openwall.com/lists/oss-security/2011/08/24/7

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:
Secunia recommends that you verify all advisories you receive by
clicking the link.
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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