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PHP Trailing Slash "open_basedir" Security Bypass
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Secunia Advisory:
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SA16971
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Release Date:
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2005-09-27
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Last Update:
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2005-11-28
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Popularity:
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13,742 views
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Critical:
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Not 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 5.0.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| | CVE reference: | CVE-2005-3054
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Description:
thorben has discovered a security issue in PHP, which can be exploited by malicious, local users to access certain files outside the "open_basedir" root.
The security issue is caused due to fopen wrappers not correctly obeying the "open_basedir" directive, which is designed to restrict PHP scripts in certain environments from accessing files outside the defined prefix. This can be exploited to access files in directories outside the "open_basedir" root as if a trailing slash on the "open_basedir" value is not taken into account.
Example:
Files in the "/user/test11/" directory can be accessed with the "open_basedir" root set to "/user/test1/", but not files in the "/user/test2/" directory.
The security issue has been confirmed in version 4.4.0 and 5.0.5. Other versions may also be affected.
Solution:
Update to version 4.4.1 or 5.1.0.
http://www.php.net/downloads.php
Provided and/or discovered by:
thorben
Changelog:
2005-10-31: Updated "Solution" section.
2005-11-28: Updated "Solution" section.
Original Advisory:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=323585
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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.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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