CVE-2025-31122: Coding Hut Auth Bypass Vulnerability

CVE-2025-31122 Overview

scratch-coding-hut.github.io is the website for Coding Hut. In version 1.0-beta3 and earlier, a critical authentication bypass vulnerability exists where the login link can be used to login to any account by simply changing the username in the username field. This vulnerability is classified as CWE-287 (Improper Authentication), indicating a fundamental flaw in the authentication mechanism that fails to properly verify user identity.

Critical Impact

This authentication bypass vulnerability allows attackers to gain unauthorized access to any user account on the platform without requiring valid credentials, potentially compromising all user data and functionality.

Affected Products

• scratch-coding-hut.github.io version 1.0-beta3 and earlier
• Scratch-Coding-Hut web application

Discovery Timeline

• 2025-03-31 - CVE-2025-31122 published to NVD
• 2025-04-01 - Last updated in NVD database

Technical Details for CVE-2025-31122

Vulnerability Analysis

This vulnerability represents a complete breakdown of authentication controls in the scratch-coding-hut application. The login mechanism fails to implement proper identity verification, allowing an attacker to authenticate as any user by manipulating the username field in the login request. This type of authentication bypass typically occurs when the application trusts client-supplied data without server-side validation or when session management is improperly implemented.

The network-based attack vector means this vulnerability can be exploited remotely by any attacker with network access to the application. The flaw enables complete account takeover, allowing attackers to access victim accounts, modify data, and perform actions on behalf of legitimate users.

Root Cause

The root cause is improper authentication (CWE-287), where the application fails to adequately verify that a user is who they claim to be during the login process. The authentication mechanism appears to accept the username value directly without validating it against proper credentials or session tokens, effectively bypassing the entire authentication workflow.

Attack Vector

The attack exploits the login functionality by modifying the username parameter in the login request. An attacker can target any account on the platform by simply specifying the desired username, gaining full access to that account without knowledge of the victim's password. The attack can be performed through a standard web browser by intercepting and modifying the login request, or by crafting a malicious login link with the target username embedded.

The vulnerability requires network access and some user interaction, but does not require any prior authentication or special privileges, making it accessible to any attacker who can reach the application.

Detection Methods for CVE-2025-31122

Indicators of Compromise

• Unusual login patterns where users appear to authenticate from unexpected locations or IP addresses
• Multiple accounts being accessed from the same source IP in quick succession
• User complaints about unauthorized access or changes to their accounts
• Login events without corresponding authentication credential submissions in logs

Detection Strategies

• Monitor authentication logs for anomalies such as multiple successful logins to different accounts from a single IP address
• Implement behavioral analytics to detect unusual session creation patterns
• Deploy web application firewalls (WAF) with rules to detect parameter manipulation in login requests
• Set up alerts for login events that bypass normal authentication flows

Monitoring Recommendations

• Enable detailed logging for all authentication-related endpoints
• Monitor for unusual patterns in the username field during login requests
• Track session creation events and correlate with authentication records
• Review access logs for signs of automated account enumeration or mass login attempts

How to Mitigate CVE-2025-31122

Immediate Actions Required

• Immediately upgrade to a patched version of scratch-coding-hut if available
• Consider temporarily disabling the affected login functionality until a fix is applied
• Force logout all active sessions to invalidate any potentially compromised accounts
• Review recent login activity for signs of unauthorized access
• Notify users to review their account activity and change credentials

Patch Information

Users should monitor the GitHub Security Advisory for official patch information and updated releases. The GitHub Issue Discussion may also contain additional remediation guidance from the maintainers.

Workarounds

• Implement additional authentication factors or verification steps before granting access
• Add server-side validation to ensure username matches authenticated session credentials
• Deploy network-level access controls to limit exposure while awaiting a patch
• Consider implementing rate limiting on login endpoints to slow potential exploitation
• Use a reverse proxy or WAF to filter suspicious login requests

# Example: Block access to login endpoint temporarily (Apache)
# Add to .htaccess or site configuration
<Location "/login">
    Order deny,allow
    Deny from all
    # Allow only trusted IPs during remediation
    Allow from 10.0.0.0/8
</Location>