How the CVE Works:
The vulnerability arises due to insufficient input validation in the customer account portal’s email section. When a user creates an email address, the “domain” field accepts user input without proper sanitization. An attacker can intercept the request using tools like Burp Suite and inject malicious HTML payloads, such as <a href="https://malicious-site.com">CLiCK</a>. This payload is then reflected on the error page, rendering the injected HTML. When a victim clicks the link, they are redirected to an external malicious website, enabling phishing attacks, credential theft, or malware distribution. The vulnerability is classified as medium severity due to its potential impact on user security and the lack of authentication requirements for exploitation.
DailyCVE Form:
Platform: Customer Account Portal
Version: Unspecified
Vulnerability: HTML Injection
Severity: Medium
Date: 2023-XX-XX
What Undercode Say:
Exploitation:
- Intercept Request: Use Burp Suite to intercept the HTTP request when creating an email address.
- Inject Payload: Replace the “domain” field with an HTML payload like
<a href="https://malicious-site.com">CLiCK</a>. - Forward Request: Send the modified request to the server.
- Observe Reflection: Check the error page for the reflected payload.
- Redirect Victim: When the victim clicks the link, they are redirected to the malicious site.
Protection:
- Input Validation: Implement strict input validation to reject HTML tags in user inputs.
- Output Encoding: Encode user inputs before rendering them on the page to prevent HTML interpretation.
- Sanitization: Use libraries like DOMPurify to sanitize user inputs.
- Content Security Policy (CSP): Enforce a CSP to restrict the execution of unauthorized scripts.
- Regular Audits: Conduct regular security audits to identify and fix vulnerabilities.
Example Code:
Input Validation Example import re def sanitize_input(user_input): Strip HTML tags clean_input = re.sub(r'<[bash]+>', '', user_input) return clean_input Output Encoding Example from html import escape def encode_output(user_input): return escape(user_input)
Commands:
- Burp Suite Command: Use `burpsuite` to intercept and modify HTTP requests.
- CSP Header: Add `Content-Security-Policy: default-src ‘self’;` to HTTP headers.
- Sanitization Library: Install DOMPurify using
npm install dompurify.
Analytics:
- Exploit Complexity: Low (requires basic knowledge of HTML and Burp Suite).
- Impact: Medium (phishing, credential theft, reputational damage).
- Prevalence: Common in web applications with poor input validation.
- Mitigation Difficulty: Low (standard sanitization and encoding practices suffice).
References:
- OWASP HTML Injection: https://owasp.org/www-community/attacks/HTML_Injection
- DOMPurify Documentation: https://github.com/cure53/DOMPurify
- Burp Suite Guide: https://portswigger.net/burp/documentation
This structured approach ensures clarity and actionable insights for both exploitation and protection against the vulnerability.
References:
Reported By: https://github.com/advisories/GHSA-26xq-m8xw-6373
Extra Source Hub:
Undercode
