The "frames.html" file within the Yard Doc's generated documentation is vulnerable to Cross-Site Scripting (XSS) attacks due to inadequate sanitization of user input within the JavaScript segment of the "frames.erb" template file.
The vulnerability stems from mishandling user-controlled data retrieved from the URL hash in the embedded JavaScript code within the "frames.erb" template file. Specifically, the script lacks proper sanitization of the hash data before utilizing it to establish the top-level window's location. This oversight permits an attacker to inject malicious JavaScript payloads through carefully crafted URLs.
<script type="text/javascript">
var match = unescape(window.location.hash).match(/^#!(.+)/);
var name = match ? match[1] : '<%= url_for_main %>';
name = name.replace(/^(\w+):\/\//, '').replace(/^\/\//, '');
window.top.location = name;
</script>
<script type="text/javascript">
var match = decodeURIComponent(window.location.hash).match(/^#!(.+)/);
var name = match ? match[1] : '<%= url_for_main %>';
name = name.replace(/^((\w*):)?[\/\\]*/gm, '').trim();
window.top.location.replace(name)
</script>
This XSS vulnerability presents a substantial threat by enabling an attacker to execute arbitrary JavaScript code within the user's session context. Potential ramifications include session hijacking, theft of sensitive data, unauthorized access to user accounts, and defacement of websites. Any user visiting the compromised page is susceptible to exploitation. It is critical to promptly address this vulnerability to mitigate potential harm to users and preserve the application's integrity.
RedYetiDev Finder
Summary
The "frames.html" file within the Yard Doc's generated documentation is vulnerable to Cross-Site Scripting (XSS) attacks due to inadequate sanitization of user input within the JavaScript segment of the "frames.erb" template file.
Details
The vulnerability stems from mishandling user-controlled data retrieved from the URL hash in the embedded JavaScript code within the "frames.erb" template file. Specifically, the script lacks proper sanitization of the hash data before utilizing it to establish the top-level window's location. This oversight permits an attacker to inject malicious JavaScript payloads through carefully crafted URLs.
Snippet from "frames.erb":
(v0.9.34)
(v0.9.35)
PoC (Proof of Concept)
To exploit this vulnerability:
#!javascript:xssfor v0.9.34, and#:javascript:xssfor v0.9.35Impact
This XSS vulnerability presents a substantial threat by enabling an attacker to execute arbitrary JavaScript code within the user's session context. Potential ramifications include session hijacking, theft of sensitive data, unauthorized access to user accounts, and defacement of websites. Any user visiting the compromised page is susceptible to exploitation. It is critical to promptly address this vulnerability to mitigate potential harm to users and preserve the application's integrity.
References