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PHP Session Handling Double Free Vulnerabilities
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Secunia Advisory:
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SA24505
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Release Date:
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2007-03-15
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Last Update:
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2007-05-04
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Popularity:
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10,773 views
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Critical:
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Less critical
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Impact:
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System access
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Where:
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Local system
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Solution Status:
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Partial Fix
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| Software: | PHP 4.4.x
PHP 5.0.x
PHP 5.1.x
PHP 5.2.x
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| CVE reference: | CVE-2007-1521
CVE-2007-1522
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Description:
Stefan Esser has reported some vulnerabilities in PHP, which can be exploited by malicious users to compromise a vulnerable system.
1) A double free error within the "session_regenerate_id()" function can be exploited to execute arbitrary code with the privileges of the PHP interpreter.
2) A double free error within the handling of rejected sessions in PHP's internal storage module can be exploited to execute arbitrary code with the privileges of the PHP interpreter.
Successful exploitation requires that a user can e.g. upload and execute malicious PHP scripts. Remote exploitation may be possible, but has not currently been proven.
The vulnerabilities are reported in version 5.2.0 and 5.2.1, vulnerability #1 potentially also affects version 4.x. Other versions may also be affected.
Solution:
Update to version 5.2.2 or 4.4.7 to fix vulnerability #1. Allow only trusted users to upload and execute PHP scripts.
Provided and/or discovered by:
Stefan Esser
Changelog:
2007-03-26: Added CVE reference.
2007-05-03: Updated "Solution" and "Description" section. Added vulnerable version 4.x.
Original Advisory:
PHP:
http://www.php.net/releases/5_2_2.php
http://www.php.net/releases/4_4_7.php
MOPB:
http://www.php-security.org/MOPB/MOPB-22-2007.html
http://www.php-security.org/MOPB/MOPB-23-2007.html
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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