CVE-2024-20720: Adobe Commerce RCE Vulnerability

CVE-2024-20720 Overview

CVE-2024-20720 is a critical OS Command Injection vulnerability affecting Adobe Commerce (formerly Magento) e-commerce platform. The vulnerability stems from Improper Neutralization of Special Elements used in an OS Command (CWE-78), allowing attackers to achieve arbitrary code execution on affected systems. This vulnerability is particularly dangerous as exploitation does not require user interaction, enabling attackers to compromise vulnerable installations remotely.

Critical Impact

This vulnerability allows remote attackers with high privileges to execute arbitrary commands on the underlying operating system, potentially leading to complete system compromise, data exfiltration, and lateral movement within the network.

Affected Products

• Adobe Commerce 2.4.6-p3 and earlier in the 2.4.6.x branch
• Adobe Commerce 2.4.5-p5 and earlier in the 2.4.5.x branch
• Adobe Commerce 2.4.4-p6 and earlier in the 2.4.4.x branch

Discovery Timeline

• February 15, 2024 - CVE-2024-20720 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-20720

Vulnerability Analysis

This vulnerability is classified as an OS Command Injection flaw (CWE-78), which occurs when an application constructs operating system commands using externally-influenced input without proper neutralization of special elements. In the context of Adobe Commerce, this allows an authenticated attacker with administrative privileges to inject malicious commands that are then executed by the underlying operating system.

The vulnerability affects the scope boundary, meaning successful exploitation can impact resources beyond the vulnerable component's security scope. This characteristic significantly amplifies the potential damage, as attackers can affect the confidentiality, integrity, and availability of the entire hosting infrastructure, not just the Adobe Commerce application itself.

Root Cause

The root cause of CVE-2024-20720 lies in the insufficient sanitization of user-controlled input before it is incorporated into OS command execution. Adobe Commerce fails to properly neutralize or escape special characters and command sequences that could be interpreted by the operating system shell. This oversight allows malicious payloads to break out of the intended command context and execute arbitrary commands with the privileges of the web server process.

Attack Vector

The attack vector for this vulnerability is network-based, meaning the vulnerability can be exploited remotely over the network without requiring physical access to the target system. The attack requires high privileges (administrative access to the Adobe Commerce backend), but once that prerequisite is met, exploitation does not require any user interaction.

An attacker with administrative credentials could craft a malicious request containing specially formatted OS command injection payloads. When processed by the vulnerable Adobe Commerce component, these payloads are passed to the system shell without proper sanitization, resulting in arbitrary command execution. Typical attack scenarios include:

• Injecting shell metacharacters (;, |, &&, `, $()) to chain additional commands
• Leveraging command execution to establish reverse shells for persistent access
• Exfiltrating sensitive data including customer information and payment details
• Installing web shells or cryptocurrency miners on the compromised server

Detection Methods for CVE-2024-20720

Indicators of Compromise

• Unusual outbound network connections from the web server to unknown external IP addresses
• Unexpected processes running under the web server user context (e.g., www-data, apache, nginx)
• New or modified files in web-accessible directories, particularly PHP files with obfuscated code
• Suspicious entries in web server access logs containing shell metacharacters or encoded command sequences
• Evidence of scheduled tasks or cron jobs created by the web server user

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block OS command injection patterns in HTTP requests
• Monitor Adobe Commerce administrative access logs for unusual authentication patterns or actions
• Deploy file integrity monitoring (FIM) on critical Adobe Commerce directories to detect unauthorized modifications
• Analyze web server access logs for requests containing command injection signatures such as shell operators and encoded payloads

Monitoring Recommendations

• Enable verbose logging for Adobe Commerce administrative actions and monitor for anomalies
• Configure SIEM alerts for process execution events originating from the web server user account
• Monitor network traffic for beaconing behavior or data exfiltration patterns from the e-commerce server
• Regularly audit administrative user accounts and access permissions in Adobe Commerce

How to Mitigate CVE-2024-20720

Immediate Actions Required

• Upgrade Adobe Commerce to the latest patched version immediately (2.4.6-p4 or later, 2.4.5-p6 or later, 2.4.4-p7 or later)
• Audit all administrative user accounts and disable any that are unused or suspicious
• Implement strict network segmentation to limit the blast radius of potential compromise
• Review web server logs for any indicators of compromise prior to patching

Patch Information

Adobe has released security patches to address this vulnerability in security bulletin APSB24-03. Organizations running affected versions should apply the relevant security patch immediately:

• Adobe Commerce 2.4.6.x: Upgrade to 2.4.6-p4 or later
• Adobe Commerce 2.4.5.x: Upgrade to 2.4.5-p6 or later
• Adobe Commerce 2.4.4.x: Upgrade to 2.4.4-p7 or later

For detailed patch installation instructions, refer to the Adobe Security Advisory APSB24-03.

Workarounds

• Restrict administrative panel access to trusted IP addresses only using firewall rules or .htaccess configuration
• Implement multi-factor authentication (MFA) for all administrative accounts to reduce the risk of credential compromise
• Deploy a Web Application Firewall with command injection detection rules as a defense-in-depth measure
• Consider temporarily disabling remote administrative access until patches can be applied

# Example: Restrict admin access by IP in Apache .htaccess
<Directory /var/www/html/admin>
    Require ip 10.0.0.0/8
    Require ip 192.168.1.0/24
</Directory>