Source: cve@mitre.org
Cross-site scripting (XSS) vulnerability in the Print (aka Printer, e-mail and PDF versions) module 5.x before 5.x-4.9 and 6.x before 6.x-1.9, a module for Drupal, allows remote attackers to inject arbitrary web script or HTML via crafted data in a list of links.
Drupal's Print module is vulnerable to a cross-site scripting (XSS) attack, allowing attackers to inject malicious scripts into web pages viewed by users. This vulnerability could lead to account compromise, data theft, or website defacement. Successful exploitation requires a user to view a crafted link within the Print module.
Step 1: Crafting the Payload: The attacker crafts a malicious URL containing a JavaScript payload within the link data. This payload could be a simple alert box or a more sophisticated script designed to steal cookies or redirect the user.
Step 2: Delivering the Payload: The attacker sends the crafted URL to a potential victim, often through phishing, social engineering, or by embedding it on a compromised website.
Step 3: Victim Interaction: The victim clicks on the malicious link, which is processed by the Print module.
Step 4: Payload Execution: The Print module renders the page, including the attacker's crafted link. Because the input wasn't properly sanitized, the browser executes the JavaScript payload embedded in the link data, leading to the XSS attack.
The vulnerability stems from insufficient input validation and output encoding within the Print module when handling a list of links. Specifically, the module fails to properly sanitize user-supplied data before rendering it in the HTML output. This allows an attacker to inject malicious JavaScript or HTML tags into the page, which are then executed by the victim's browser. The root cause is a lack of HTML entity encoding or other input sanitization techniques applied to the user-provided link data before it's displayed. The module likely directly incorporates user-supplied data into the HTML, creating a reflected XSS scenario.
While no specific APTs are directly linked to this specific CVE, XSS vulnerabilities are commonly used by various threat actors. This vulnerability could be exploited by any attacker with basic web skills. This CVE is not listed on the CISA KEV.
Web Application Firewall (WAF) logs showing suspicious HTTP requests containing JavaScript payloads (e.g., <script>, onerror, javascript:).
Network traffic analysis revealing unusual HTTP requests to the Drupal site containing potentially malicious scripts in the URL parameters.
Server-side logs indicating the Print module is processing requests with unusual link data.
Content Security Policy (CSP) violations reported by browsers, indicating attempts to execute unauthorized scripts.
Upgrade the Print module to a patched version (5.x-4.9 or later, or 6.x-1.9 or later).
Implement a Web Application Firewall (WAF) to filter out malicious requests containing XSS payloads.
Enable and configure a Content Security Policy (CSP) to restrict the execution of inline scripts and scripts from untrusted sources.
Regularly scan the Drupal installation for vulnerabilities using security scanners.
Apply input validation and output encoding to all user-supplied data to prevent XSS vulnerabilities. Specifically, ensure proper HTML entity encoding of all output.
Review and sanitize all custom code within the Drupal installation, especially any code that handles user input or output.