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Ajax Chat Cross-Site Scripting and Information Disclosure
Secunia Advisory: SA21286
Release Date: 2006-07-31
Last Update: 2006-08-08
Popularity: 5,766 views

Critical:
Moderately critical
Impact: Cross Site Scripting
Exposure of sensitive information
Where: From remote
Solution Status: Unpatched

Software:Ajax Chat 0.x

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CVE reference:CVE-2006-3971
CVE-2006-3972


Description:
Sirdarckcat has discovered two vulnerabilities in Ajax Chat, which can be exploited by malicious people to conduct cross-site scripting attacks and disclose sensitive information.

1) Input passed to the "chatid" parameter in includes/operator_chattranscript.php isn't properly sanitised before being used in a "fopen()" call. This can be exploited to disclose the content of arbitrary files structured in a certain way via directory traversal attacks.

2) Input passed to the "userid" parameter in visitor/livesupport/chat.php isn't 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.

The vulnerabilities have been confirmed in version 0.1. Other versions may also be affected.

Solution:
Edit the source code to ensure that input is properly sanitised.

Provided and/or discovered by:
Sirdarckcat

Changelog:
2006-08-08: Added CVE references.


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