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PHP Integer Overflow Vulnerability and Security Bypass
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Secunia Advisory:
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SA25456
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Release Date:
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2007-06-01
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Last Update:
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2007-09-06
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Critical:
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Less critical
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Impact:
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Security Bypass
Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| Software: | PHP 5.2.x
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| | CVE reference: | CVE-2007-2872 (Secunia mirror)
CVE-2007-3007 (Secunia mirror)
CVE-2007-4660 (Secunia mirror)
CVE-2007-4661 (Secunia mirror)
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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.
Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, scan using the Network Software Inspector.
Solution:
Update to version 5.2.4.
http://www.php.net/downloads.php
Provided and/or discovered by:
The vendor credits:
1) Gerhard Wagner, SEC Consult
2) bugs dot php dot net at chsc dot dk
Changelog:
2007-06-04: Added information provided by SEC Consult. Added link to "Original Advisory" section. Updated "Criticality".
2007-06-06: Updated "Solution" section based on additional information provided by Stefan Esser.
2007-06-12: Added CVE reference.
2007-08-31: Updated the "Solution" section.
2007-09-06: Added CVE reference.
Original Advisory:
PHP:
http://www.php.net/releases/5_2_3.php
SEC Consult:
http://www.sec-consult.com/291.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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