CVE-2024-47919: Tiki Wiki CMS RCE Vulnerability

CVE-2024-47919 Overview

CVE-2024-47919 is a critical OS command injection vulnerability affecting Tiki Wiki CMS. This vulnerability stems from improper neutralization of special elements used in OS commands (CWE-78), allowing attackers to inject and execute arbitrary system commands on the underlying server. The flaw enables unauthenticated remote attackers to gain complete control over affected Tiki Wiki installations through maliciously crafted input that bypasses input validation mechanisms.

Critical Impact

This OS command injection vulnerability allows unauthenticated remote attackers to execute arbitrary system commands on affected Tiki Wiki CMS servers, potentially leading to complete system compromise, data exfiltration, and persistent access.

Affected Products

• Tiki Wiki CMS (specific vulnerable versions not disclosed)

Discovery Timeline

• December 30, 2024 - CVE-2024-47919 published to NVD
• December 30, 2024 - Last updated in NVD database

Technical Details for CVE-2024-47919

Vulnerability Analysis

This vulnerability represents a severe security flaw in Tiki Wiki CMS where user-supplied input is incorporated into OS commands without proper sanitization or validation. OS command injection vulnerabilities occur when an application passes unsafe user data to a system shell, allowing attackers to append additional commands or modify the intended command execution flow. In the context of web applications like Tiki Wiki CMS, this typically manifests when file operations, system utilities, or other shell-based functions process user input directly.

The vulnerability is exploitable over the network without requiring authentication or user interaction, making it particularly dangerous for internet-facing Tiki Wiki installations. Successful exploitation grants attackers the ability to read sensitive files, modify system configurations, install malware, pivot to other network systems, or establish persistent backdoor access.

Root Cause

The root cause of CVE-2024-47919 lies in the failure to properly sanitize special characters and shell metacharacters from user-controlled input before incorporating it into operating system commands. Tiki Wiki CMS contains functionality that constructs shell commands using external input without adequate validation, allowing characters such as ;, |, &, $(), and backticks to be interpreted as command separators or substitution operators by the underlying shell.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests containing shell metacharacters that, when processed by the vulnerable Tiki Wiki component, result in arbitrary command execution on the server. The attacker simply needs network access to the Tiki Wiki CMS installation to exploit this vulnerability.

The vulnerability allows injection of arbitrary OS commands through improperly sanitized input fields. Common exploitation techniques include using semicolons to chain commands, pipe operators to redirect output, or backticks and $() syntax for command substitution. Once exploited, attackers typically establish reverse shells, download additional payloads, or enumerate the system for further exploitation opportunities. For additional technical details, see the Israeli Government CVE Advisory.

Detection Methods for CVE-2024-47919

Indicators of Compromise

• Unusual outbound network connections from web server processes (e.g., PHP spawning netcat or curl connections to external hosts)
• Unexpected child processes spawned by the web server or PHP-FPM processes
• Web access logs containing shell metacharacters (;, |, &, $(, backticks) in URL parameters or POST data
• Creation of new files in web-accessible directories or /tmp with suspicious names or executable permissions
• Anomalous system command execution patterns in process accounting or auditd logs

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block requests containing OS command injection patterns
• Implement application-level logging to capture and alert on suspicious input patterns targeting Tiki Wiki endpoints
• Configure endpoint detection tools to monitor for unusual process trees where web server processes spawn shell commands
• Enable system auditing (auditd on Linux) to track execve calls from web application user contexts

Monitoring Recommendations

• Monitor web server logs for requests with encoded or unencoded shell metacharacters in parameters
• Establish baseline behavior for web server process activity and alert on deviations
• Implement network egress monitoring to detect unauthorized outbound connections from web server infrastructure
• Review Tiki Wiki application logs for error messages indicating command execution failures or unexpected input

How to Mitigate CVE-2024-47919

Immediate Actions Required

• Immediately assess exposure by identifying all Tiki Wiki CMS installations in your environment
• Implement WAF rules to block requests containing OS command injection patterns
• Restrict network access to Tiki Wiki administrative interfaces using IP whitelisting or VPN requirements
• Consider temporarily taking affected Tiki Wiki installations offline until patches can be applied
• Review server logs for evidence of exploitation attempts or successful compromise

Patch Information

Organizations should monitor the official Tiki Wiki project for security updates addressing CVE-2024-47919. Check the Israeli Government CVE Advisory for additional guidance and patch availability. Apply vendor-provided security patches as soon as they become available, and ensure all Tiki Wiki installations are updated to the latest secure version.

Workarounds

• Deploy a Web Application Firewall with rules specifically targeting command injection patterns in HTTP requests
• Implement strict input validation at the network edge using reverse proxy configurations
• Disable or restrict access to vulnerable Tiki Wiki functionality until official patches are available
• Run Tiki Wiki with minimal system privileges using a dedicated unprivileged user account
• Consider containerizing Tiki Wiki deployments to limit the blast radius of potential exploitation

# Example WAF rule for ModSecurity to block common command injection patterns
SecRule ARGS "@rx (?:;|\||`|\$\(|&&)" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'Potential OS Command Injection Detected - CVE-2024-47919',\
    tag:'attack-injection-command'"