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TITLE:
X.Org Grab-Breaking Keybinding Security Bypass Weakness

SECUNIA ADVISORY ID:
SA47566

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47566/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47566

RELEASE DATE:
2012-01-19

DISCUSS ADVISORY:
http://secunia.com/advisories/47566/#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/47566/

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=47566

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:
Gu1 has discovered a weakness in X.Org, which can be exploited by
malicious people with physical access to bypass certain security
restrictions.

The weakness is caused due to xserver providing a grab-breaking
hotkey functionality, which is bound by default in xkeyboard-config.
This can be exploited to e.g. bypass the lock mechanism provided by
certain screen savers by pressing a certain key combination.

SOLUTION:
Do not rely on the screen locking mechanism provided by screen
savers.

PROVIDED AND/OR DISCOVERED BY:
Gu1

ORIGINAL ADVISORY:
http://gu1.aeroxteam.fr/2012/01/19/bypass-screensaver-locker-program-xorg-111-and-up/

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.
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