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Insecure Library Loading

Secunia Advisory SA22993

OpenBSD ELF ld.so Environment Cleaning Vulnerability
Secunia Advisory SA22993
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Release Date 2006-11-20
Last Update 2006-11-30
   
Popularity 10,846 views
Comments 0 comments

Criticality level Less criticalLess critical
Impact Privilege escalation
Where Local system
Authentication level Available in Customer Area
   
Report reliability Available in Customer Area
Solution Status Vendor Patch
   
Systems affected Available in Customer Area
Approve distribution Available in Customer Area
   
Operating System
OpenBSD 3.x
OpenBSD 4.0
Secunia CVSS Score Available in Customer Area
CVE Reference(s) CVE-2006-6164 CVSS available in Customer Area
  

Description

A vulnerability has been reported in OpenBSD, which can be exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to the "_dl_unsetenv()" function of the OpenBSD dynamic loader failing to properly sanitise the environment. This can be exploited to gain escalated privileges by calling suid "root" binaries with specially crafted environment variables.


Solution
Apply patch.
Further details available in Customer Area

Provided and/or discovered by
Reported by Mark Dowd, John McDonald and Justin Schuh.

Changelog
Further details available in Customer Area

Original Advisory
http://www.openbsd.org/errata.html#ldso

http://lists.grok.org.uk/pipermail/full-disclosure/2006-November/050829.html

Deep Links
Links available in Customer Area


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: OpenBSD ELF ld.so Environment Cleaning Vulnerability
 
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