CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
AI Score
Confidence
High
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.
Snippet from “frames.erb”:
(v0.9.34)
<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>
(v0.9.35)
<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.