CVE-2021-47754: Arunna 1.0.0 CSRF Vulnerability

CVE-2021-47754 Overview

Arunna 1.0.0 contains a cross-site request forgery (CSRF) vulnerability that allows attackers to manipulate user profile settings without authentication. Attackers can craft a malicious form to change user details, including passwords, email, and administrative privileges by tricking authenticated users into submitting the form.

Critical Impact

Attackers can hijack authenticated user sessions to modify account credentials, email addresses, and administrative privileges, potentially leading to complete account takeover and unauthorized administrative access.

Affected Products

• Arunna 1.0.0

Discovery Timeline

• 2026-01-15 - CVE CVE-2021-47754 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2021-47754

Vulnerability Analysis

This vulnerability is classified as Cross-Site Request Forgery (CWE-352), a web application security flaw where the application fails to validate that requests originated from a trusted source. In Arunna 1.0.0, the user profile management functionality lacks proper CSRF token validation, allowing attackers to forge requests that appear to come from legitimate authenticated users.

The attack requires user interaction, as the victim must be tricked into visiting a malicious page or clicking a crafted link while authenticated to the Arunna application. Once triggered, the forged request executes with the victim's session privileges, enabling unauthorized modifications to sensitive account settings.

Root Cause

The root cause of this vulnerability is the absence of anti-CSRF mechanisms in the Arunna application's form submission handlers. The application does not implement CSRF tokens, same-site cookie attributes, or origin header validation for state-changing operations. This allows external websites to craft form submissions that the server processes as legitimate user requests.

Attack Vector

The attack is network-based and requires no authentication from the attacker's perspective. The exploitation flow involves:

1. The attacker crafts a malicious HTML page containing a hidden form that targets Arunna's profile update endpoint
2. The form includes pre-filled malicious values for password, email, and privilege fields
3. The victim, while authenticated to Arunna, visits the attacker's malicious page
4. JavaScript on the malicious page automatically submits the form, or the victim is tricked into clicking a button
5. The victim's browser sends the forged request with valid session cookies to Arunna
6. Arunna processes the request as legitimate, updating the victim's profile with attacker-controlled values

The attacker can leverage this to change the victim's password (locking them out), modify their email address (for password recovery attacks), or escalate privileges if the victim has administrative capabilities. Technical details and proof-of-concept information are available in the Archived Blog Post on Hacking and Exploit-DB #50608.

Detection Methods for CVE-2021-47754

Indicators of Compromise

• Unexpected user profile changes including email, password, or privilege modifications without user-initiated actions
• Web server logs showing profile update requests with referrer headers from external domains
• Multiple account modifications occurring in rapid succession from single authenticated sessions
• User reports of being logged out or unable to access accounts after visiting external websites

Detection Strategies

• Monitor web application logs for profile update requests with unusual or missing Referer headers
• Implement alerting for rapid succession of account modification events
• Deploy web application firewalls (WAF) with CSRF detection capabilities
• Analyze HTTP request patterns for automated form submissions targeting sensitive endpoints

Monitoring Recommendations

• Enable detailed access logging for all state-changing operations in the Arunna application
• Implement session activity monitoring to detect unusual account modifications
• Configure alerts for administrative privilege changes occurring outside normal operational hours
• Review authentication logs for patterns consistent with account takeover attempts

How to Mitigate CVE-2021-47754

Immediate Actions Required

• Audit all user accounts for unauthorized modifications, particularly administrative privilege escalations
• Force password resets for accounts showing suspicious activity
• Implement CSRF token validation on all state-changing forms and API endpoints
• Deploy a web application firewall with CSRF protection rules as an interim measure

Patch Information

No official vendor patch information is currently available. Users should monitor the Arunna GitHub Repository for updates and security fixes. Consider upgrading to newer versions when released, or implement compensating controls as described in the workarounds section.

Workarounds

• Implement custom CSRF token middleware to protect all form submissions until an official patch is available
• Configure SameSite=Strict or SameSite=Lax attributes on session cookies to prevent cross-origin request forgery
• Require re-authentication for sensitive operations such as password changes and privilege modifications
• Deploy origin header validation to reject requests from untrusted sources
• Consider disabling external access to the application until proper CSRF protections are in place

# Example: Configure SameSite cookie attribute in web server
# Apache configuration
Header edit Set-Cookie ^(.*)$ $1;SameSite=Strict

# Nginx configuration  
proxy_cookie_flags ~ secure samesite=strict;