PHP 'ibase_gen_id()' Function off-by-one Buffer Overflow Vulnerability

Bugtraq ID:	42516
Class:	Boundary Condition Error
CVE:
Remote:	Yes
Local:	No
Published:	Aug 18 2010 12:00AM
Updated:	Aug 18 2010 12:24PM
Credit:	Canberk BOLAT
Vulnerable:	PHP PHP 5.3.3
Not Vulnerable:

PHP 'ibase_gen_id()' Function off-by-one Buffer Overflow Vulnerability

PHP is prone to an off-by-one buffer-overflow vulnerability because it fails to perform boundary checks before copying user-supplied data to insufficiently sized memory buffers.

An attacker can exploit this issue to execute arbitrary machine code in the context of the PHP process. Failed exploit attempts will likely crash the webserver, denying service to legitimate users.

PHP 5.3.3 is vulnerable; other versions may also be affected.

PHP 'ibase_gen_id()' Function off-by-one Buffer Overflow Vulnerability

The following proof-of-concept code is available:

• /data/vulnerabilities/exploits/42516.zip

PHP 'ibase_gen_id()' Function off-by-one Buffer Overflow Vulnerability

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

PHP 'ibase_gen_id()' Function off-by-one Buffer Overflow Vulnerability

References:

• PHP 5.3.3 ibase_gen_id() off-by-one Overflow Vulnerability (Canberk BOLAT)
  
• PHP Homepage (PHP Group)