CVE-2024-22127: SAP NetWeaver Application Server RCE Flaw

CVE-2024-22127 Overview

CVE-2024-22127 is a command injection vulnerability affecting SAP NetWeaver Administrator AS Java, specifically within the Administrator Log Viewer plug-in. This vulnerability allows an attacker with high privileges to upload potentially dangerous files, leading to command injection that can severely impact the confidentiality, integrity, and availability of the application.

The vulnerability is classified under CWE-77 (Improper Neutralization of Special Elements used in a Command), indicating that user-controlled input is improperly handled during command execution, enabling arbitrary command injection.

Critical Impact

Authenticated attackers with administrative privileges can achieve remote command execution on SAP NetWeaver AS Java servers, potentially compromising enterprise-critical business applications and sensitive data.

Affected Products

• SAP NetWeaver Application Server Java version 7.50
• SAP NetWeaver Administrator AS Java (Administrator Log Viewer plug-in)
• Systems running cpe:2.3:a:sap:netweaver_application_server_java:7.5

Discovery Timeline

• 2024-03-12 - CVE-2024-22127 published to NVD
• 2025-02-07 - Last updated in NVD database

Technical Details for CVE-2024-22127

Vulnerability Analysis

This command injection vulnerability exists in the Administrator Log Viewer plug-in component of SAP NetWeaver AS Java. The flaw allows authenticated attackers with administrative privileges to upload files containing malicious content that, when processed by the application, results in arbitrary command execution on the underlying server.

The vulnerability enables attacks that can cause significant impact across all three security pillars: confidentiality through unauthorized data access, integrity through system modification, and availability through service disruption. The scope is changed, meaning successful exploitation can affect resources beyond the vulnerable component itself.

Root Cause

The root cause stems from insufficient input validation and sanitization in the file upload functionality of the Administrator Log Viewer plug-in. When processing uploaded files, the application fails to properly neutralize special elements that could be interpreted as command sequences, allowing attackers to inject and execute arbitrary system commands.

This vulnerability type (CWE-77) typically occurs when an application constructs command strings using user-supplied input without proper escaping or validation, enabling attackers to manipulate the command structure.

Attack Vector

The attack is conducted over the network and requires the attacker to have high-level privileges (administrative access) to the SAP NetWeaver Administrator console. No user interaction is required to exploit the vulnerability once administrative access is obtained.

The exploitation flow involves:

1. An attacker authenticates to the SAP NetWeaver Administrator console with administrative credentials
2. The attacker navigates to the Log Viewer plug-in functionality
3. A specially crafted file containing command injection payloads is uploaded
4. The application processes the malicious file without proper sanitization
5. Injected commands execute with the privileges of the SAP NetWeaver AS Java process

For detailed technical information about this vulnerability, refer to SAP Note #3433192 which provides specific technical details and remediation guidance.

Detection Methods for CVE-2024-22127

Indicators of Compromise

• Unusual file uploads to the Administrator Log Viewer plug-in from administrative accounts
• Unexpected process spawning from the SAP NetWeaver AS Java service
• Anomalous command execution patterns on systems hosting SAP NetWeaver
• Suspicious network connections originating from SAP application servers
• Log entries indicating failed or successful command execution attempts

Detection Strategies

• Monitor SAP Security Audit Log (SM21) for unusual administrative activities in the Log Viewer plug-in
• Implement file integrity monitoring on SAP NetWeaver AS Java directories
• Deploy endpoint detection rules to identify command injection patterns and suspicious process trees
• Review web application firewall logs for malformed file upload requests targeting SAP administrative interfaces

Monitoring Recommendations

• Enable verbose logging for the SAP NetWeaver Administrator console and Log Viewer plug-in
• Configure SIEM alerts for administrative access to the Log Viewer plug-in, especially from unusual source IPs
• Monitor system-level command execution for processes spawned by the SAP Java application service account
• Implement user behavior analytics to detect anomalous administrative actions

How to Mitigate CVE-2024-22127

Immediate Actions Required

• Apply the security patch referenced in SAP Note #3433192 immediately
• Review administrative access to SAP NetWeaver AS Java and enforce least-privilege principles
• Audit recent Log Viewer plug-in usage for signs of exploitation
• Implement network segmentation to limit exposure of SAP administrative interfaces
• Enable enhanced logging for forensic analysis if compromise is suspected

Patch Information

SAP has released a security patch addressing this vulnerability. Administrators should apply the fix documented in SAP Note #3433192. The patch is available through the SAP Support Portal and should be applied following standard change management procedures.

Additional guidance is available in the SAP Security Notes Overview.

Workarounds

• Restrict network access to the SAP NetWeaver Administrator console to trusted administrative networks only
• Implement strong authentication mechanisms (MFA) for all administrative accounts
• Disable or restrict access to the Administrator Log Viewer plug-in if not operationally required
• Deploy web application firewall rules to inspect and filter file uploads to SAP administrative interfaces
• Conduct regular access reviews to minimize the number of users with administrative privileges

Mitigation configuration example for restricting administrative interface access via network controls:

# Example: Restrict access to SAP NetWeaver Admin console using host-based firewall
# Allow only from trusted management network (adjust IPs as needed)
iptables -A INPUT -p tcp --dport 50000 -s 10.0.100.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 50000 -j DROP

# Log connection attempts for audit purposes
iptables -A INPUT -p tcp --dport 50000 -j LOG --log-prefix "SAP-Admin-Access: "