CVE-2024-25951: Dell iDRAC8 RCE Vulnerability

CVE-2024-25951 Overview

A command injection vulnerability exists in the local RACADM interface of Dell iDRAC8. This security flaw allows a malicious authenticated user to inject arbitrary commands and potentially gain control of the underlying operating system. The vulnerability affects Dell's Integrated Dell Remote Access Controller 8 (iDRAC8), which is a critical server management platform used for remote server administration.

Critical Impact

Authenticated attackers with adjacent network access can execute arbitrary commands on the underlying operating system, potentially leading to complete system compromise of Dell server infrastructure.

Affected Products

• Dell iDRAC8 (all versions prior to security update)

Discovery Timeline

• 2024-03-09 - CVE-2024-25951 published to NVD
• 2025-01-31 - Last updated in NVD database

Technical Details for CVE-2024-25951

Vulnerability Analysis

This command injection vulnerability (CWE-77) in Dell iDRAC8's local RACADM component allows authenticated users to escape the intended command context and execute arbitrary operating system commands. The vulnerability stems from improper validation of consistency in special elements within the RACADM interface (CWE-1288).

The iDRAC8 (Integrated Dell Remote Access Controller 8) provides out-of-band management capabilities for Dell PowerEdge servers, enabling administrators to perform remote system management tasks. The local RACADM (Remote Access Controller Admin) utility is a command-line interface used for configuring and managing iDRAC settings.

When an authenticated user interacts with the local RACADM interface, insufficient input sanitization allows specially crafted input to be interpreted as operating system commands rather than RACADM parameters. This can result in arbitrary command execution with the privileges of the underlying iDRAC operating system.

Root Cause

The root cause of this vulnerability is improper input validation in the local RACADM command-line interface. The vulnerability is classified under CWE-77 (Improper Neutralization of Special Elements used in a Command) and CWE-1288 (Improper Validation of Consistency within Input), indicating that special characters and command separators are not properly sanitized before being processed by the shell interpreter.

When user-supplied input containing command injection payloads (such as shell metacharacters) is passed to the RACADM utility, these elements are not properly escaped or filtered, allowing attackers to break out of the intended command context and inject their own commands.

Attack Vector

The attack requires adjacent network access and valid authentication credentials to the iDRAC8 interface. Once authenticated, an attacker can leverage the local RACADM utility to inject malicious commands that will be executed by the underlying operating system.

The attack flow involves:

1. Attacker obtains valid credentials for the iDRAC8 management interface
2. Attacker connects to the target system via adjacent network access
3. Attacker crafts malicious input containing command injection payloads
4. The local RACADM utility processes the input without proper sanitization
5. Injected commands execute with operating system privileges

The vulnerability mechanism involves improper handling of special characters in the RACADM command-line interface. When user input is passed to shell commands without adequate sanitization, attackers can inject additional commands using shell metacharacters such as semicolons, pipes, or command substitution syntax. Refer to the Dell Security Advisory DSA-2024-089 for detailed technical information.

Detection Methods for CVE-2024-25951

Indicators of Compromise

• Unexpected command execution patterns in iDRAC8 system logs
• Unusual processes spawned from the RACADM utility context
• Evidence of shell metacharacters in RACADM command history or audit logs
• Unauthorized configuration changes to iDRAC8 settings

Detection Strategies

• Monitor iDRAC8 authentication logs for suspicious login patterns from adjacent network segments
• Implement logging and alerting for RACADM command execution, particularly commands containing special characters
• Deploy network monitoring to detect unusual traffic patterns to/from iDRAC management interfaces
• Review iDRAC8 audit logs for unexpected system-level command execution

Monitoring Recommendations

• Enable comprehensive audit logging on all iDRAC8 instances
• Configure SIEM integration to collect and analyze iDRAC management interface logs
• Establish baseline behavior for RACADM command usage and alert on deviations
• Monitor for unauthorized access attempts from adjacent network segments to iDRAC interfaces

How to Mitigate CVE-2024-25951

Immediate Actions Required

• Update Dell iDRAC8 firmware to the latest patched version immediately
• Review and restrict network access to iDRAC management interfaces using network segmentation
• Audit all user accounts with access to iDRAC8 and enforce least-privilege principles
• Implement strong authentication mechanisms and review credential management practices

Patch Information

Dell has released a security update to address this vulnerability. Administrators should apply the security patch documented in Dell Security Advisory DSA-2024-089. The advisory provides detailed instructions for obtaining and applying the appropriate firmware update for affected iDRAC8 systems.

Workarounds

• Isolate iDRAC management networks from general network traffic using VLANs or dedicated management networks
• Restrict access to the local RACADM utility to only essential administrative personnel
• Implement network access controls to limit adjacent network access to authorized systems only
• Consider disabling local RACADM access if not required for operational purposes until patching is complete

# Network segmentation example for iDRAC management
# Ensure iDRAC interfaces are on isolated management VLAN
# Example firewall rule to restrict iDRAC access
iptables -A INPUT -p tcp --dport 443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP