CVE-2024-11633: Ivanti Connect Secure RCE Vulnerability

CVE-2024-11633 Overview

CVE-2024-11633 is an argument injection vulnerability affecting Ivanti Connect Secure, a widely deployed enterprise VPN solution. This vulnerability allows a remote authenticated attacker with administrative privileges to achieve remote code execution on affected systems. The flaw exists in versions prior to 22.7R2.4 and represents a significant security risk for organizations relying on Ivanti Connect Secure for secure remote access.

Critical Impact

Authenticated administrators can leverage argument injection to execute arbitrary code on the underlying system, potentially leading to complete compromise of the VPN appliance and subsequent lateral movement within enterprise networks.

Affected Products

• Ivanti Connect Secure versions prior to 22.7R2.4
• Ivanti Connect Secure 22.7 (all releases through R2.3)
• Ivanti Connect Secure 22.7R1, R1.1, R1.2, R1.3, R1.4, R1.5
• Ivanti Connect Secure 22.7R2, R2.1, R2.2, R2.3

Discovery Timeline

• 2024-12-10 - CVE-2024-11633 published to NVD
• 2025-01-17 - Last updated in NVD database

Technical Details for CVE-2024-11633

Vulnerability Analysis

This vulnerability is classified as CWE-88 (Improper Neutralization of Argument Delimiters in a Command), commonly known as argument injection. The flaw allows an authenticated attacker with administrative access to inject malicious arguments into system commands executed by the Ivanti Connect Secure appliance. When exploited, this results in remote code execution with the privileges of the underlying service.

VPN appliances like Ivanti Connect Secure are particularly attractive targets because they sit at the network perimeter and handle sensitive authentication traffic. A compromised VPN gateway can provide attackers with access to internal network resources, credential harvesting opportunities, and a persistent foothold for advanced persistent threat (APT) operations.

Root Cause

The vulnerability stems from improper neutralization of argument delimiters within command parameters processed by the Ivanti Connect Secure administrative interface. When user-controlled input is passed to system commands without proper sanitization or escaping of special characters, attackers can inject additional arguments that alter the behavior of the intended command.

The lack of strict input validation on administrative functions allows malicious payloads to be interpreted as command-line arguments rather than data, enabling arbitrary code execution on the underlying operating system.

Attack Vector

The attack requires network access to the Ivanti Connect Secure administrative interface along with valid administrator credentials. An attacker who has obtained or compromised admin-level access can craft specially formatted input containing argument injection payloads. When processed by vulnerable system commands, these payloads execute attacker-controlled code on the appliance.

The vulnerability is exploitable through the administrative web interface, where argument delimiters and special characters can be embedded in input fields. The injected arguments are then passed to backend system commands, resulting in unintended command execution. Organizations should note that while administrative access is required, compromised admin credentials from phishing attacks, credential stuffing, or previous breaches could enable exploitation.

For detailed technical information, refer to the Ivanti Security Advisory December 2024.

Detection Methods for CVE-2024-11633

Indicators of Compromise

• Unusual administrative login activity or authentication patterns from unexpected IP addresses
• Unexpected process spawning or command execution on Ivanti Connect Secure appliances
• Log entries showing malformed or unusual administrative commands with special characters
• Network connections from the VPN appliance to suspicious external destinations

Detection Strategies

• Monitor Ivanti Connect Secure logs for administrative actions containing suspicious argument patterns or escape sequences
• Implement behavioral analysis to detect anomalous command execution patterns on VPN appliances
• Deploy network detection rules to identify potential exploitation traffic targeting administrative endpoints
• Review admin user accounts for unauthorized access or credential compromise indicators

Monitoring Recommendations

• Enable verbose logging on Ivanti Connect Secure administrative interfaces and forward logs to a SIEM
• Implement real-time alerting for administrative authentication events, especially from new or unusual sources
• Establish baseline behavior for administrative operations and alert on deviations
• Monitor for outbound connections from VPN appliances that may indicate post-exploitation activity

How to Mitigate CVE-2024-11633

Immediate Actions Required

• Upgrade Ivanti Connect Secure to version 22.7R2.4 or later immediately
• Audit administrative accounts for unauthorized access and enforce strong authentication controls
• Review administrative access logs for any signs of exploitation or suspicious activity
• Restrict administrative interface access to trusted networks and IP addresses only

Patch Information

Ivanti has released version 22.7R2.4 of Connect Secure which addresses this argument injection vulnerability. Organizations should prioritize applying this update, particularly given that VPN appliances are critical infrastructure components. The patch is available through Ivanti's standard distribution channels. Detailed patch information and installation guidance can be found in the Ivanti Security Advisory December 2024.

Workarounds

• Implement network segmentation to limit access to administrative interfaces from untrusted networks
• Enable multi-factor authentication (MFA) for all administrative accounts to reduce credential compromise risk
• Deploy web application firewalls (WAF) in front of administrative interfaces to filter malicious input patterns
• Conduct regular review of administrative user privileges and remove unnecessary admin access

# Restrict administrative access to specific IP ranges (example firewall rule)
# Consult Ivanti documentation for appliance-specific configuration
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP