Gammarays has discovered two vulnerabilities in Chatness, which can be exploited by malicious people to bypass certain security restrictions and by malicious users to compromise a vulnerable system.
1) The vulnerability is caused due to improper authentication verification in admin/options.php. This can be exploited to retrieve the administrator username and password.
2) Input passed to the "html" parameter in admin/save.php is not properly sanitised before it is written to head.html or foot.html. Both files are included in index.php, which can be exploited to execute arbitrary PHP code.
Successful exploitation requires valid administrator credentials (see vulnerability #1).
The vulnerabilities are confirmed in version 2.5.3. Other versions may also be affected.
Solution: Restrict access to the "admin/options.php" script (e.g. with ".htaccess").
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Subject: Chatness Security Bypass and PHP Code Execution
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