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Secunia Advisory SA25065

XScreenSaver "getpwuid()" Authentication Bypass Weakness
Secunia Advisory SA25065
Secunia VIM 4.0 - Free Trial
Release Date 2007-05-03
   
Popularity 9,179 views
Comments 0 comments

Criticality level Not criticalNot critical
Impact Security Bypass
Where Local system
Authentication level This information is available to Secunia VIM customers
   
Report reliability This information is available to Secunia VIM customers
Solution Status Vendor Patch
   
Systems affected This information is available to Secunia VIM customers
Approve distribution This information is available to Secunia VIM customers
   
Software:
XScreenSaver 4.x
XScreenSaver 5.x

Secunia CVSS Score This information is available to Secunia VIM Customers
CVE Reference(s) CVE-2007-1859 CVSS score available to Secunia VIM customers
  

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

Deep Links
Links available to Secunia VIM customers


Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: XScreenSaver "getpwuid()" Authentication Bypass Weakness
 
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