Libsafe Multi-threaded Process Race Condition Security Bypass Weakness

Bugtraq ID:	13190
Class:	Race Condition Error
CVE:	CVE-2005-1125
Remote:	Yes
Local:	Yes
Published:	Apr 15 2005 12:00AM
Updated:	Jul 12 2009 12:56PM
Credit:	Discovery is credited to Overflow.pl.
Vulnerable:	Avaya Labs Libsafe 2.0 -16
Not Vulnerable:

Libsafe Multi-threaded Process Race Condition Security Bypass Weakness

Libsafe will normally kill an application when certain types of memory corruption are detected, preventing exploitation of some buffer overflow and format string vulnerabilities. A weakness has been reported that may allow Libsafe security failsafe mechanisms to be bypassed.

This vulnerability is due to a race condition that may be exposed when Libsafe is used with multi-threaded applications. The result is that Libsafe security features may be bypassed and an attack that would ordinarily be prevented may succeed. It should be noted that this is an implementation error in Libsafe that does not present a security risk unless there is a memory corruption vulnerability in a multi-threaded application on an affected computer.

This issue was reported in Libsafe 2.0-16. Other versions may also be affected.

Libsafe Multi-threaded Process Race Condition Security Bypass Weakness

A proof-of-concept was provided to demonstrate the issue. The proof-of-concept may need to be executed multiple times to successfully exploit the issue.

• /data/vulnerabilities/exploits/libsafe-PoC.c

Libsafe Multi-threaded Process Race Condition Security Bypass Weakness

Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Libsafe Multi-threaded Process Race Condition Security Bypass Weakness

References:

• Libsafe Project Page (Avaya Labs)
  
• [Overflow.pl] Libsafe - Safety Check Bypass Vulnerability ("Overflow.pl" )