CVE-2022-44877: Control Web Panel (CWP) RCE Vulnerability

CVE-2022-44877 Overview

CVE-2022-44877 is a critical command injection vulnerability affecting Control Web Panel (CWP), also known as CentOS Web Panel, version 7 before 0.9.8.1147. The vulnerability exists in the login/index.php file and allows remote attackers to execute arbitrary OS commands via shell metacharacters injected into the login parameter. This unauthenticated remote code execution vulnerability has been actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Critical Impact

This vulnerability allows unauthenticated remote attackers to achieve complete system compromise by executing arbitrary operating system commands on vulnerable CWP installations. Active exploitation has been confirmed in the wild.

Affected Products

• Control Web Panel (CWP) 7 versions before 0.9.8.1147
• CentOS Web Panel 7 versions before 0.9.8.1147
• control-webpanel webpanel (all vulnerable versions)

Discovery Timeline

• 2023-01-05 - CVE-2022-44877 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2022-44877

Vulnerability Analysis

The vulnerability is classified as CWE-78 (OS Command Injection), which occurs when an application constructs OS commands using externally-influenced input without proper neutralization of special characters. In this case, the login/index.php script in Control Web Panel fails to sanitize user-supplied input in the login parameter before passing it to system shell commands.

Control Web Panel is a popular free web hosting control panel designed to manage servers with minimal overhead. The login functionality processes user credentials through a PHP script that inadvertently allows shell metacharacters to be interpreted by the underlying operating system. Since authentication is not required to reach the vulnerable endpoint, any attacker with network access to the CWP login page can exploit this flaw.

The vulnerability requires no user interaction and can be exploited remotely over the network with low attack complexity. Successful exploitation grants attackers the ability to read, modify, or delete any data accessible to the web server process, potentially leading to full server compromise.

Root Cause

The root cause is insufficient input validation in the login/index.php file. The login parameter accepts user input that is subsequently used in an OS command execution context without proper sanitization or escaping of shell metacharacters. Characters such as semicolons (;), backticks (`), pipes (|), and command substitution syntax ($()) can be used to break out of the intended command context and execute arbitrary commands.

Attack Vector

The attack is conducted over the network by sending a specially crafted HTTP request to the /login/index.php endpoint. The attacker injects shell metacharacters into the login parameter, which are then interpreted by the server's shell when the login process executes system commands.

The exploitation technique involves embedding OS commands within the login parameter using shell metacharacters. When the vulnerable CWP installation processes the malicious input, it executes the injected commands with the privileges of the web server process. Multiple proof-of-concept exploits have been published demonstrating this attack, including resources available at Packet Storm Security and the Full Disclosure Mailing List.

Detection Methods for CVE-2022-44877

Indicators of Compromise

• Unusual HTTP POST requests to /login/index.php containing shell metacharacters (;, |, `, $()) in the login parameter
• Unexpected process spawning from the web server process (e.g., /bin/sh, /bin/bash, wget, curl)
• Web server logs showing malformed or suspicious login parameter values with encoded or raw special characters
• Reverse shell connections originating from the CWP server to unknown external IP addresses
• Presence of web shells or unauthorized files in web-accessible directories

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block command injection patterns in POST parameters targeting /login/index.php
• Monitor web server access logs for requests containing shell metacharacters or URL-encoded equivalents (%3B, %7C, %60)
• Deploy endpoint detection and response (EDR) solutions to identify anomalous process creation chains originating from the PHP or web server process
• Use intrusion detection systems (IDS) with signatures for known CVE-2022-44877 exploitation patterns

Monitoring Recommendations

• Enable verbose logging on the CWP server and forward logs to a SIEM for centralized analysis
• Monitor outbound network connections from the web server for unexpected destinations or protocols
• Track file system changes in web server directories and system binary locations
• Alert on authentication failures combined with unusual parameter lengths or special character usage

How to Mitigate CVE-2022-44877

Immediate Actions Required

• Update Control Web Panel to version 0.9.8.1147 or later immediately
• If immediate patching is not possible, restrict network access to the CWP login page using firewall rules
• Review server logs for indicators of compromise and evidence of prior exploitation
• Consider taking vulnerable systems offline until patching is complete given the active exploitation status

Patch Information

The vulnerability has been addressed in Control Web Panel version 0.9.8.1147 and later. Organizations should upgrade to this version or newer to remediate the vulnerability. Given that this CVE is listed in CISA's Known Exploited Vulnerabilities catalog, federal agencies and organizations following CISA guidance should prioritize patching. Additional technical details are available in the GitHub Gist Security Details and the CISA Vulnerability Catalog Entry.

Workarounds

• Implement network-level access controls to restrict access to the CWP login page to trusted IP addresses only
• Deploy a web application firewall (WAF) configured to block requests containing shell metacharacters in POST parameters
• Place the CWP server behind a VPN to prevent direct internet exposure of the management interface
• Disable or rename the vulnerable login/index.php script if the login functionality is not immediately required

# Example firewall rule to restrict CWP access to trusted IP
iptables -A INPUT -p tcp --dport 2030 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 2030 -j DROP
iptables -A INPUT -p tcp --dport 2031 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 2031 -j DROP