CVE-2023-51467: Apache OFBiz Auth Bypass Vulnerability

CVE-2023-51467 Overview

CVE-2023-51467 is an authentication bypass vulnerability in Apache OFBiz, an open-source enterprise resource planning (ERP) system. The vulnerability permits attackers to circumvent authentication processes, enabling them to remotely execute arbitrary code on affected systems. This flaw is classified under CWE-918 (Server-Side Request Forgery), indicating that the vulnerability involves improper validation of user-supplied input that can be exploited to make unauthorized requests from the server.

Apache OFBiz is widely deployed in enterprise environments for managing various business processes including e-commerce, inventory management, and customer relationship management. The critical nature of this vulnerability, combined with its network-accessible attack vector requiring no authentication or user interaction, makes it a significant threat to organizations running vulnerable versions.

Critical Impact

This vulnerability enables unauthenticated attackers to bypass security controls and achieve remote code execution on Apache OFBiz servers, potentially leading to complete system compromise, data exfiltration, and lateral movement within enterprise networks.

Affected Products

• Apache OFBiz versions prior to 18.12.11
• All installations of Apache OFBiz with exposed web interfaces
• Enterprise deployments using Apache OFBiz for ERP functionality

Discovery Timeline

• December 26, 2023 - CVE-2023-51467 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-51467

Vulnerability Analysis

This authentication bypass vulnerability in Apache OFBiz allows remote attackers to circumvent the application's security mechanisms without requiring any prior authentication credentials. The flaw enables attackers to gain unauthorized access to protected functionality within the ERP system.

The vulnerability is particularly dangerous because it can be exploited entirely over the network without any user interaction. Once authentication is bypassed, attackers can leverage additional attack chains to achieve arbitrary code execution on the underlying server. This creates a pathway from initial unauthorized access to complete system compromise.

Organizations using Apache OFBiz for critical business operations face significant risk, as successful exploitation could lead to unauthorized access to sensitive business data, financial records, customer information, and other confidential enterprise resources managed by the ERP system.

Root Cause

The root cause of CVE-2023-51467 stems from improper validation and handling of authentication-related requests within Apache OFBiz. The vulnerability is classified under CWE-918 (Server-Side Request Forgery), indicating that the application fails to properly validate user-controlled input, allowing attackers to craft malicious requests that bypass authentication checks.

The authentication bypass occurs when the application improperly processes specially crafted requests, allowing attackers to circumvent the intended security controls. This architectural weakness in the authentication flow enables unauthorized access to protected resources and functionality.

Attack Vector

The attack vector for CVE-2023-51467 is network-based, meaning attackers can exploit this vulnerability remotely over the network without requiring local access to the target system. The exploitation path involves:

1. Initial Reconnaissance - Attackers identify exposed Apache OFBiz instances through network scanning or internet-wide reconnaissance
2. Crafting Malicious Requests - Specially crafted HTTP requests are constructed to bypass authentication mechanisms
3. Authentication Bypass - The malicious requests exploit the vulnerability to gain unauthorized access
4. Code Execution - Once authenticated controls are bypassed, attackers can leverage the access to execute arbitrary code

The vulnerability requires no privileges and no user interaction, making it trivially exploitable by remote attackers who can reach the vulnerable Apache OFBiz service over the network.

For detailed technical analysis of the exploitation mechanism, refer to the Vicarius Analysis on OFBiz Vulnerabilities and the Openwall OSS-Security Mailing List Post.

Detection Methods for CVE-2023-51467

Indicators of Compromise

• Unusual HTTP requests targeting Apache OFBiz authentication endpoints with malformed or unexpected parameters
• Unexpected process execution originating from the OFBiz Java process or web server user context
• Authentication log entries showing successful access without corresponding valid credential submissions
• Network connections from OFBiz servers to unexpected external destinations indicating potential SSRF exploitation

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block exploitation attempts targeting known OFBiz authentication bypass patterns
• Implement network intrusion detection system (NIDS) signatures to identify malicious request patterns associated with CVE-2023-51467
• Enable detailed logging on Apache OFBiz instances and monitor for anomalous authentication events
• Utilize SentinelOne Singularity platform to detect post-exploitation activities including unauthorized code execution and suspicious process behavior

Monitoring Recommendations

• Monitor Apache OFBiz access logs for requests containing unusual URI patterns or parameter manipulation targeting authentication endpoints
• Track process creation events on OFBiz servers to detect unauthorized command execution following potential exploitation
• Implement file integrity monitoring on critical OFBiz configuration and application files to detect tampering
• Establish baseline network behavior for OFBiz servers and alert on deviations that may indicate successful compromise

How to Mitigate CVE-2023-51467

Immediate Actions Required

• Upgrade Apache OFBiz immediately to version 18.12.11 or later, which contains the security fix for this vulnerability
• If immediate patching is not possible, restrict network access to Apache OFBiz instances using firewall rules to limit exposure
• Implement web application firewall rules to filter potentially malicious requests targeting the authentication bypass
• Audit systems for signs of compromise if they were exposed to the internet while running vulnerable versions

Patch Information

Apache has addressed this vulnerability in Apache OFBiz version 18.12.11. Organizations should download the patched version from the Apache OFBiz Download Page and apply it as soon as possible. Full details about the security fixes are available in the Apache OFBiz Release Notes 18.12.11.

Additional information about the vulnerability and the fix can be found in the Apache JIRA Issue OFBIZ-12873 and the Apache OFBiz Security Overview.

Workarounds

• Place Apache OFBiz behind a reverse proxy with strict access controls and authentication requirements
• Implement network segmentation to isolate OFBiz instances from direct internet exposure
• Use IP allowlisting to restrict access to OFBiz administrative interfaces to trusted networks only
• Enable additional logging and monitoring while awaiting patch deployment to detect any exploitation attempts

# Example: Restrict access to OFBiz using iptables
# Allow only trusted IP ranges to access OFBiz port
iptables -A INPUT -p tcp --dport 8443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8443 -j DROP

# Example: Configure reverse proxy rate limiting in nginx
# Add to nginx configuration for OFBiz proxy
limit_req_zone $binary_remote_addr zone=ofbiz_limit:10m rate=10r/s;
limit_req zone=ofbiz_limit burst=20 nodelay;