A vulnerability has been identified in PHP, which could be exploited by malicious users to bypass security policies. This flaw is due to an error in "fopen_wrappers.c" that does not properly restrict access to other directories when the "open_basedir" directive includes a trailing slash, which could allow certain scripts in a directory (e.g. "/user/test2/) to access files in other directories whose names are substrings of the original directory (e.g. "/user/test22/).
Credits
Vulnerability reported by thorben
ChangeLog
2005-09-27 : Initial release
2005-10-31 : Updated Solution
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