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PHP Integer Overflow Vulnerability and Security Bypass

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Release Date:  2007-06-01    Last Update:  2007-09-06    Views:  19,324

Secunia Advisory SA25456

Where:

Local system

Impact:

Security Bypass, Privilege escalation

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


A weakness and a vulnerability have been reported in PHP 5, which can be exploited by malicious, local users to bypass certain security restrictions.

1) An integer overflow error in the "chunk_split()" function can be exploited to cause a heap based buffer overflow.

Successful exploitation of this vulnerability may allow execution of arbitrary code, which can lead to security restrictions, such as the "disable_functions" directive, being bypassed.

2) An error in the "realpath()" function allows bypassing of the "open_basedir" restriction and identifying the existence of files.


Solution:
Update to version 5.2.4.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits:
1) Gerhard Wagner, SEC Consult
2) bugs dot php dot net at chsc dot dk

Original Advisory:
PHP:
http://www.php.net/releases/5_2_3.php

SEC Consult:
http://www.sec-consult.com/291.html

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: PHP Integer Overflow Vulnerability and Security Bypass

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