CVE-2024-47115: IBM VIOS RCE Vulnerability

CVE-2024-47115 Overview

CVE-2024-47115 is a command injection vulnerability affecting IBM AIX 7.2, 7.3, and VIOS 3.1 and 4.1. The vulnerability exists due to improper neutralization of input, which could allow a local user to execute arbitrary commands on the system. This weakness is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), a well-known vulnerability class that enables attackers to inject malicious commands into system operations.

Critical Impact

Local users with access to affected IBM AIX or VIOS systems can execute arbitrary commands, potentially leading to complete system compromise, data theft, or service disruption.

Affected Products

• IBM AIX 7.2
• IBM AIX 7.3
• IBM VIOS 3.1
• IBM VIOS 4.1

Discovery Timeline

• 2024-12-07 - CVE-2024-47115 published to NVD
• 2025-01-21 - Last updated in NVD database

Technical Details for CVE-2024-47115

Vulnerability Analysis

This command injection vulnerability (CWE-78) stems from insufficient input validation within IBM AIX and VIOS systems. When user-controlled input is passed to system commands without proper sanitization, an attacker can inject additional commands that execute with the privileges of the vulnerable application or service. The local attack vector means that an attacker must already have some level of access to the target system to exploit this vulnerability.

The impact of successful exploitation is significant: an attacker can achieve arbitrary command execution, which could lead to unauthorized access to sensitive data, modification of system configurations, installation of backdoors, or complete system takeover depending on the privilege level of the vulnerable component.

Root Cause

The root cause of CVE-2024-47115 is improper neutralization of special characters in user-supplied input before that input is used in OS command construction. IBM AIX and VIOS fail to adequately sanitize or escape shell metacharacters and command separators (such as ;, |, &, $(), and backticks) when processing certain input parameters. This allows attackers to break out of the intended command context and execute arbitrary system commands.

Attack Vector

The attack requires local access to an affected IBM AIX or VIOS system. An authenticated local user can craft malicious input containing command injection payloads. When this input is processed by the vulnerable component, the injected commands are executed by the underlying operating system. No user interaction is required beyond the attacker having local access and the ability to provide input to the vulnerable functionality.

The vulnerability does not require high privileges to exploit, making it accessible to standard users who could leverage it for privilege escalation or lateral movement within the environment.

Detection Methods for CVE-2024-47115

Indicators of Compromise

• Unusual command execution patterns in system audit logs, particularly commands containing shell metacharacters or unexpected command chaining
• Processes spawned by system services that typically do not create child processes
• Anomalous user activity from accounts accessing IBM AIX or VIOS administrative functions
• Unexpected modifications to system files or configurations following user command execution

Detection Strategies

• Enable comprehensive auditing on IBM AIX systems using the audit subsystem to capture command execution events
• Monitor for suspicious command patterns including semicolons, pipes, and backticks in application input logs
• Deploy endpoint detection and response (EDR) solutions capable of monitoring process creation and command-line arguments on AIX systems
• Implement file integrity monitoring on critical system binaries and configuration files

Monitoring Recommendations

• Review /var/adm/sulog and system audit trails for unexpected privilege escalation attempts
• Configure alerts for command execution anomalies, particularly from non-administrative users
• Monitor network connections initiated by processes that should not require external communication
• Establish baseline normal command execution patterns to identify deviations indicative of exploitation

How to Mitigate CVE-2024-47115

Immediate Actions Required

• Apply the security patches provided by IBM as soon as possible by following the guidance in the IBM Support Advisory
• Restrict local access to IBM AIX and VIOS systems to only authorized and necessary users
• Review and audit current user accounts and permissions on affected systems
• Implement the principle of least privilege for all user accounts

Patch Information

IBM has released security updates to address this vulnerability. Administrators should consult the IBM Support Page for detailed patching instructions and download links for IBM AIX 7.2, 7.3, and VIOS 3.1 and 4.1. It is critical to test patches in a non-production environment before deploying to production systems, following organizational change management procedures.

Workarounds

• Limit local shell access to only essential personnel while patches are being evaluated and deployed
• Implement strict input validation at the application layer for any custom scripts or tools that interface with the affected components
• Use network segmentation to isolate AIX and VIOS systems from less trusted network zones
• Enable enhanced auditing and monitoring to detect exploitation attempts while awaiting patch deployment

# Enable enhanced auditing on IBM AIX
# Configure audit subsystem for command monitoring
/usr/sbin/audit start
# Review audit configuration
/usr/sbin/audit query
# Check current security patch levels
instfix -i | grep IY
oslevel -s