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The guestbook.pl script attempts to sanitize user input by removing text between "<!--" and "-->" to prevent SSI command injection. However, this approach is insufficient when running on Apache 1.3.9 and possibly other versions, as Apache recognizes additional SSI closing sequences beyond "-->", allowing attackers to inject and execute arbitrary commands via crafted input.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single Metasploit module (guestbook_ssi_exec.rb) that exploits a command execution vulnerability in Matt Wright's guestbook.pl CGI script (versions 2.3.1 and earlier). The exploit targets web servers where HTML posting is enabled in guestbook.pl and SSI is enabled for '.html' files. The module works by submitting a POST request to the guestbook.pl script with a malicious SSI directive embedded in the 'comments' field. This directive, when rendered in the guestbook HTML output, is executed by the server's SSI handler, allowing arbitrary command execution. The module supports a variety of command payloads and is fully integrated into the Metasploit framework, making it weaponized and easy to use. The only endpoints referenced are the CGI script and the guestbook HTML output file, both of which are configurable. The exploit is associated with CVE-1999-1053.
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