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PHP "sscanf()" Code Execution Safe Mode Bypass
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Secunia Advisory:
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SA21403
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Release Date:
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2006-08-08
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Last Update:
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2006-08-18
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Popularity:
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13,446 views
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Critical:
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Less critical
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Impact:
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Security Bypass
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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 4.4.x
PHP 5.1.x
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| CVE reference: | CVE-2006-4020
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Description:
Heintz has discovered a vulnerability in PHP, which potentially can be exploited by malicious, local users to bypass certain security restrictions.
The vulnerability is caused due to an array boundary error in the "sscanf()" PHP function in the processing of the "$1s" format specifier. This can be exploited to reference freed memory by passing an variable as argument which has been unset.
Successful exploitation may e.g. allow bypass of the safe mode protection by executing arbitrary code.
The vulnerability has been confirmed in versions 5.1.4 and 4.4.3. Prior versions may also be affected.
Solution:
Update to version 4.4.4 or 5.1.5.
http://www.php.net/downloads.php
Provided and/or discovered by:
Heintz
Changelog:
2006-08-10: Added CVE reference.
2006-08-18: Updated "Solution" section.
Original Advisory:
http://bugs.php.net/bug.php?id=38322
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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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