CVE-2023-50968: Apache OFBiz SSRF Vulnerability

CVE-2023-50968 Overview

CVE-2023-50968 is an arbitrary file properties reading vulnerability affecting Apache OFBiz, the open-source enterprise resource planning (ERP) system developed by the Apache Software Foundation. This vulnerability allows unauthenticated attackers to read arbitrary file properties by exploiting improper authorization checks when processing specific URI calls. Additionally, the same vulnerable endpoint can be leveraged to conduct Server-Side Request Forgery (SSRF) attacks without requiring authentication, potentially enabling attackers to access internal network resources or perform reconnaissance activities.

Critical Impact

Unauthenticated attackers can read sensitive file properties and perform SSRF attacks against internal network resources, potentially leading to information disclosure and further compromise of backend systems.

Affected Products

• Apache OFBiz versions prior to 18.12.11
• Apache OFBiz ERP deployments with default configurations
• Enterprise systems utilizing Apache OFBiz for business operations

Discovery Timeline

• December 26, 2023 - CVE-2023-50968 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-50968

Vulnerability Analysis

This vulnerability combines two distinct security weaknesses: Information Exposure (CWE-200) and Server-Side Request Forgery (CWE-918). The flaw exists in how Apache OFBiz handles URI calls without properly enforcing authorization checks. When an unauthenticated user submits a crafted URI request, the application fails to validate whether the requester has appropriate permissions, allowing arbitrary file property access and SSRF exploitation.

The dual nature of this vulnerability significantly increases its impact potential. The arbitrary file properties reading component allows attackers to gather sensitive information about the underlying system, including file metadata, paths, and configuration details. The SSRF component enables attackers to make requests from the server to internal services that may not be directly accessible from external networks, potentially bypassing firewall restrictions and network segmentation controls.

Root Cause

The root cause of CVE-2023-50968 lies in missing authorization checks within the URI handling mechanism of Apache OFBiz. The application fails to properly validate user permissions before processing certain URI requests, allowing unauthenticated users to access functionality that should require authentication. This authorization bypass enables both the file property reading and SSRF attack vectors through a single vulnerable endpoint.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction, making it highly accessible to remote attackers. An attacker can exploit this vulnerability by sending specially crafted HTTP requests to the vulnerable URI endpoint. The attack can be executed remotely against any exposed Apache OFBiz instance without needing valid credentials.

For the arbitrary file properties reading attack, the attacker crafts a URI that references target files on the server, causing the application to return metadata and properties of those files. For the SSRF attack, the attacker manipulates the URI to force the server to make requests to arbitrary internal or external destinations.

Technical exploitation details are documented in the Apache JIRA Issue OFBIZ-12875 and the OpenWall Security Announcement.

Detection Methods for CVE-2023-50968

Indicators of Compromise

• Unusual URI patterns in web server logs targeting internal file paths or network resources
• HTTP requests containing file path traversal sequences or internal IP addresses in URI parameters
• Outbound connections from the OFBiz server to unexpected internal hosts or services
• Access logs showing repeated requests to specific OFBiz endpoints without valid session tokens

Detection Strategies

• Monitor web application firewall (WAF) logs for SSRF indicators such as requests containing internal IP addresses, localhost references, or cloud metadata endpoints
• Implement file integrity monitoring to detect unauthorized access attempts to sensitive configuration files
• Deploy network detection rules to identify suspicious outbound traffic patterns from OFBiz application servers
• Review Apache OFBiz access logs for unauthenticated requests to sensitive URI endpoints

Monitoring Recommendations

• Enable verbose logging on Apache OFBiz instances to capture detailed request information
• Configure network monitoring to alert on connections from OFBiz servers to internal services that are not part of normal operations
• Implement real-time alerting for requests matching known SSRF and path traversal patterns
• Establish baseline network behavior for OFBiz servers to identify anomalous outbound connections

How to Mitigate CVE-2023-50968

Immediate Actions Required

• Upgrade Apache OFBiz to version 18.12.11 or later immediately
• Restrict network access to Apache OFBiz instances using firewall rules and network segmentation
• Implement web application firewall rules to block potential SSRF and file access exploitation attempts
• Review access logs for evidence of exploitation attempts against vulnerable endpoints

Patch Information

Apache has released version 18.12.11 of OFBiz which addresses this vulnerability. Users are strongly recommended to upgrade to this version or later. The patch implements proper authorization checks on the affected URI handling mechanism, preventing both the arbitrary file properties reading and SSRF attack vectors.

Detailed information about the fix can be found in the Apache OFBiz Release Notes 18.12.11. The latest version can be obtained from the Apache OFBiz Download Page.

Workarounds

• Deploy a reverse proxy or WAF in front of Apache OFBiz to filter malicious requests targeting the vulnerable endpoints
• Implement strict egress filtering to prevent the OFBiz server from making unauthorized outbound connections
• Disable or restrict access to non-essential OFBiz functionality until patching can be completed
• Use network segmentation to limit the potential impact of SSRF attacks by restricting what internal resources the OFBiz server can reach

# Example: Implement egress filtering with iptables to restrict OFBiz server outbound connections
# Allow only necessary outbound connections (adjust ports and IPs as needed)
iptables -A OUTPUT -p tcp -m owner --uid-owner ofbiz -d trusted_db_server --dport 5432 -j ACCEPT
iptables -A OUTPUT -p tcp -m owner --uid-owner ofbiz -j DROP