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Cross-site Scripting (XSS) Vulnerability in WebCalendar

Advisory ID:HTB22930
Vulnerable Versions:1.2.3 and probably prior
Tested Version:1.2.3
Advisory Publication:March 29, 2011 [without technical details]
Vendor Notification:March 29, 2011
Public Disclosure:April 12, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered vulnerability in WebCalendar which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerability in WebCalendar
The vulnerability exists due to input sanitation error in the "last_login" parameter in login.php and in the “color” parameter in colors.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 examples:
http://[host]/login.php?last_login=123%22%3E%3Cscript%3Ealert%28document.coo kie%29;%3C/script%3E
http://[host]/colors.php?color="><%73cript>alert(docum ent.cookie);</%73cript>

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[1] High-Tech Bridge Advisory HTB22930 - - Cross-site Scripting (XSS) Vulnerability in WebCalendar
[2] WebCalendar - - WebCalendar is a web-based calendar application.
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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