StAkeR has discovered some vulnerabilities and a security issue in Wysi Wiki Wyg, which can be exploited by malicious people to conduct cross-site scripting attacks and disclose sensitive information.

1) Input passed to the "c" parameter in index.php is not properly sanitised before being used to display files. This can be exploited to display arbitrary files via directory traversal attacks.

Successful exploitation of this vulnerability requires that "magic_quotes_gpc" is disabled.

2) It is possible to view certain system information returned by the "phpinfo()" function by accessing the index.php script with the "categup" parameter set to "isset".

3) Input passed to the "s" parameter in index.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

4) The "config/passwd.txt" file is stored with insecure permissions inside the web root. This can be exploited to gain knowledge of sensitive information (e.g. user names, passwords, and e-mail addresses) by requesting the file directly.

These vulnerabilities are confirmed in version 1.0. Other versions may also be affected.

Solution
Edit the source code to ensure that input is properly sanitised.
Further details available to Secunia VIM customers

Provided and/or discovered by
StAkeR

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://milw0rm.com/exploits/6042
http://milw0rm.com/exploits/7434

Deep Links
Links available to Secunia VIM customers