Title: PHP/FI Buffer Overflow Vulnerability
Severity: HIGH
Description:
The PHP/FI package which was originally written by Rasmus Lerdorf is an is an HTML-embedded scripting language. Much of its syntax is borrowed from C, Java and Perl with a couple of unique PHP-specific features thrown in. The goal of the language is to allow web developers to write dynamically generated pages quickly.
Since it's inception PHP/FI has been turned over to another development team and is now known only as PHP. Certain versions of PHP/FI had a buffer overflow which could be triggered by a remote user to gain access to the web server running PHP/FI as the UID of the http daemon.
This buffer overflow was in the function FixFilename() function in file.c, PHP attempted to pass strings whose length may be as long as 8 kilobytes into buffers as small as 128 bytes. This overwrote the stack, making it possible for an attacker to obtain shell access to the machine running the web server.
Affected Products:
- PHP PHP/FI 1.0.0
- PHP PHP/FI 2.0.0b10
References:
- PHP Development Team.: PHP Support
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