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Cross-site Scripting (XSS) Vulnerability in PhotoSmash

Advisory ID:HTB22867
Vendor:Byron Bennett
Vulnerable Versions:1.0.1 and probably prior
Tested Version:1.0.1
Advisory Publication:February 22, 2011 [without technical details]
Vendor Notification:February 22, 2011
Public Disclosure:March 8, 2011
Latest Update:March 2, 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 PhotoSmash WordPress plugin which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerability in PhotoSmash
The vulnerability exists due to input sanitation error in the "action" parameter in wp-content/plugins/photosmash-galleries/index.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]/wp-content/plugins/photosmash-galleries/index.php?action=%3Csc ript%3Ealert%28%22XSS%22 %29;%3C/script%3E

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[1] High-Tech Bridge Advisory HTB22867 - - Cross-site Scripting (XSS) Vulnerability in PhotoSmash
[2] PhotoSmash - - A photo gallery plugin for WordPress that lets your users upload images to your Galleries!
[3] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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