CVE-2024-47088: Apexsoftcell LD Geo Auth Bypass Flaw

CVE-2024-47088 Overview

CVE-2024-47088 is a critical authentication bypass vulnerability affecting Apex Softcell LD Geo and LD DP Back Office applications. The vulnerability exists due to missing restrictions for excessive failed authentication attempts on the API-based login mechanism. A remote attacker could exploit this vulnerability by conducting a brute force attack on login OTP (One-Time Password), which could lead to unauthorized access to other user accounts.

Critical Impact

Remote attackers can bypass OTP authentication through brute force attacks, potentially gaining unauthorized access to any user account in the affected systems without requiring prior authentication.

Affected Products

• Apex Softcell LD Geo (all versions)
• Apex Softcell LD DP Back Office (all versions)

Discovery Timeline

• 2024-09-19 - CVE-2024-47088 published to NVD
• 2024-09-26 - Last updated in NVD database

Technical Details for CVE-2024-47088

Vulnerability Analysis

This vulnerability is classified as CWE-307 (Improper Restriction of Excessive Authentication Attempts). The affected applications fail to implement proper rate limiting or account lockout mechanisms on their API-based login endpoints. When users authenticate, the system sends a One-Time Password (OTP) which must be entered to complete the login process. However, the API does not restrict the number of attempts an attacker can make to guess this OTP.

OTP codes are typically 4-6 digit numeric values, meaning the total keyspace is relatively small (10,000 to 1,000,000 possible combinations). Without rate limiting, an attacker can programmatically iterate through all possible OTP values in a short period of time. The network-accessible nature of this vulnerability means it can be exploited remotely without any prior authentication or user interaction required.

Root Cause

The root cause of this vulnerability is the absence of authentication attempt throttling on the OTP verification endpoint. The application does not implement:

• Rate limiting to restrict the number of OTP validation requests per time period
• Account lockout mechanisms after a threshold of failed attempts
• CAPTCHA or similar challenges to prevent automated attacks
• Exponential backoff delays between failed authentication attempts
• OTP expiration after a limited number of failed attempts

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker can target the API login endpoint and systematically brute force OTP codes. The attack flow typically involves:

1. Initiating a legitimate login request to trigger OTP generation for a target account
2. Intercepting or identifying the OTP verification API endpoint
3. Automating requests with incrementing OTP values
4. Successfully authenticating when the correct OTP is found

Due to the lack of rate limiting, this attack can be completed rapidly depending on the OTP length. For a 4-digit OTP, an attacker could potentially try all 10,000 combinations within minutes using automated tools.

The vulnerability requires no privileges and no user interaction, making it particularly dangerous. Successful exploitation allows attackers to gain high confidentiality and integrity impact on the vulnerable system, with potential for limited impact on subsequent systems.

Detection Methods for CVE-2024-47088

Indicators of Compromise

• Unusually high volume of authentication requests from single IP addresses or user agents
• Multiple failed OTP validation attempts followed by a successful login
• Sequential or pattern-based OTP submission attempts in server logs
• Automated request patterns with consistent timing intervals between attempts

Detection Strategies

• Implement logging and alerting for authentication endpoints to track failed login attempts
• Monitor API access logs for rapid successive requests to OTP verification endpoints
• Configure SIEM rules to detect brute force patterns against authentication APIs
• Deploy Web Application Firewalls (WAF) with rate limiting detection capabilities

Monitoring Recommendations

• Enable detailed logging on all authentication-related API endpoints
• Set up real-time alerts for authentication anomalies exceeding baseline thresholds
• Monitor for automated tool signatures and unusual user-agent strings in API requests
• Implement network traffic analysis to identify high-frequency requests to login endpoints

How to Mitigate CVE-2024-47088

Immediate Actions Required

• Contact Apex Softcell for available patches or updated versions addressing this vulnerability
• Implement network-level rate limiting on authentication endpoints immediately
• Deploy a Web Application Firewall (WAF) with brute force protection rules
• Consider temporarily restricting access to the affected applications from untrusted networks
• Review authentication logs for signs of exploitation attempts

Patch Information

Organizations should consult the CERT-IN Advisory CIVN-2024-0296 for official remediation guidance and contact Apex Softcell directly for patch availability. No specific patch information was available at the time of publication.

Workarounds

• Implement rate limiting at the network or application gateway level to restrict OTP validation attempts (recommended: maximum 3-5 attempts per OTP session)
• Configure account lockout policies after a threshold of failed authentication attempts
• Reduce OTP validity period to minimize the attack window for brute force attempts
• Implement CAPTCHA challenges after multiple failed authentication attempts
• Consider implementing additional authentication factors beyond OTP for sensitive accounts

# Example rate limiting configuration for nginx reverse proxy
# Limit OTP verification endpoint to 5 requests per minute per IP
limit_req_zone $binary_remote_addr zone=otp_limit:10m rate=5r/m;

location /api/auth/verify-otp {
    limit_req zone=otp_limit burst=3 nodelay;
    limit_req_status 429;
    proxy_pass http://backend_server;
}