Some vulnerabilities have been reported in WebMod, which can be exploited by malicious people to conduct cross-site scripting attacks, disclose sensitive information, cause a DoS (Denial of Service) or potentially compromise a vulnerable system.

1) Input passed to the "redir" parameter in auth.w 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.

2) A boundary error exists within the "connectHandle()" function in server.cpp. This can be exploited to cause a stack-based buffer overflow via an overly long HTTP cookie.

3) An error in parser.cpp when handling the "mode" parameter sent to auth.w can be exploited to corrupt arbitrary memory.

4) An error in parser.cpp when handling the "rconpass" parameter sent to auth.w can be exploited to cause a buffer overflow.

Successful exploitation of the vulnerabilities may allow execution of arbitrary code.

5) Input passed via HTTP requests is not properly sanitised before being used to read files. This can be exploited to read arbitrary files from local resources via directory traversal attacks.

Successful exploitation of the vulnerability requires that the application is running on Windows.

6) An error in parser.cpp when handling the "redir" parameter sent to auth.w can be exploited to trigger a NULL-pointer dereference.

The vulnerabilities are reported in version 0.48. Other versions may also be affected.

Solution
Restrict access to trusted users only.

Provided and/or discovered by
1) Nemessis
2, 3, 5, 6) Luigi Auriemma
4) shir

Changelog
Further details available to Secunia VIM customers

Original Advisory
Luigi Auriemma:
http://aluigi.altervista.org/adv/webmodz-adv.txt

shir:
http://milw0rm.com/exploits/5536

Deep Links
Links available to Secunia VIM customers