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TITLE:
XScreenSaver "getpwuid()" Authentication Bypass Weakness

SECUNIA ADVISORY ID:
SA25065

VERIFY ADVISORY:
http://secunia.com/advisories/25065/

CRITICAL:
Not critical

IMPACT:
Security Bypass

WHERE:
Local system

SOFTWARE:
XScreenSaver 5.x
http://secunia.com/product/14114/
XScreenSaver 4.x
http://secunia.com/product/10125/

DESCRIPTION:
Alex Yamauchi has reported a weakness in XScreenSaver, which
potentially can be exploited by malicious people to bypass certain
security restrictions.

The weakness is caused due to an error within the parsing of results
of a call to "getpwuid()" in drivers/lock.c when using directory
servers during a network outage. This can be exploited to e.g. crash
XScreenSaver and thus gain access to a locked system.

SOLUTION:
Update to version 5.02.

PROVIDED AND/OR DISCOVERED BY:
Alex Yamauchi

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