CVE-2024-20469: Cisco ISE Privilege Escalation Vulnerability

CVE-2024-20469 Overview

A command injection vulnerability exists in specific CLI commands within Cisco Identity Services Engine (ISE) that could allow an authenticated, local attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. This vulnerability requires the attacker to have valid Administrator privileges on an affected device before exploitation is possible.

The vulnerability stems from insufficient validation of user-supplied input in certain CLI commands. An attacker could exploit this vulnerability by submitting a crafted CLI command, which if successful, would allow the attacker to execute arbitrary commands with root-level privileges on the underlying operating system.

Critical Impact

Authenticated administrators with local access can leverage insufficient input validation in CLI commands to inject malicious commands and escalate privileges to root, potentially gaining complete control over the Cisco ISE appliance.

Affected Products

• Cisco Identity Services Engine 3.2.0 (including Patch 1 through Patch 6)
• Cisco Identity Services Engine 3.3.0 (including Patch 1 through Patch 3)

Discovery Timeline

• September 4, 2024 - CVE-2024-20469 published to NVD
• September 25, 2025 - Last updated in NVD database

Technical Details for CVE-2024-20469

Vulnerability Analysis

This command injection vulnerability (CWE-78: OS Command Injection) affects the CLI interface of Cisco Identity Services Engine. While the prerequisite of requiring Administrator privileges may seem to limit the risk, this vulnerability enables privilege escalation from an already-elevated administrative context to full root access on the underlying operating system.

The attack is performed locally, meaning the attacker must have authenticated access to the ISE device's command-line interface. Once a malicious administrator submits a specially crafted CLI command, the insufficient input validation allows injected commands to execute with root privileges, bypassing the normal privilege boundaries that exist between the ISE application layer and the underlying Linux operating system.

Root Cause

The vulnerability exists due to insufficient validation and sanitization of user-supplied input in specific CLI commands within Cisco ISE. When processing certain administrative commands, the ISE CLI fails to properly validate or escape special characters and command sequences before passing them to the underlying operating system shell. This allows an attacker with Administrator privileges to inject arbitrary OS commands that execute outside the intended scope of the CLI functionality.

Attack Vector

The attack requires local access to the Cisco ISE CLI with valid Administrator credentials. The attacker must craft a malicious CLI command that contains embedded OS commands or special characters that bypass the input validation mechanisms.

The exploitation flow involves:

1. Authenticating to the Cisco ISE CLI with Administrator credentials
2. Identifying vulnerable CLI commands that accept user input
3. Crafting a malicious command string that embeds OS commands within the expected input
4. Submitting the crafted command through the CLI
5. The injected commands execute with root privileges on the underlying operating system

Due to the local attack vector and requirement for high privileges, exploitation typically occurs in scenarios involving insider threats, compromised administrator credentials, or as a secondary attack following initial access through other means.

Detection Methods for CVE-2024-20469

Indicators of Compromise

• Unexpected commands or processes running with root privileges on ISE appliances
• Unusual CLI command patterns in ISE audit logs, particularly commands with special characters like ;, |, &, or backticks
• Modifications to system files or configurations outside normal ISE administrative activities
• New user accounts or SSH keys created on the underlying operating system

Detection Strategies

• Monitor ISE CLI command logs for anomalous input patterns or commands containing shell metacharacters
• Implement file integrity monitoring on critical system directories and configuration files
• Review ISE application logs for administrative actions that precede unexpected system-level changes
• Enable and monitor syslog forwarding from ISE appliances for unusual process execution

Monitoring Recommendations

• Configure centralized logging for all ISE administrative activities and CLI commands
• Establish baseline behavior for administrative CLI usage and alert on deviations
• Monitor for root-level process execution that doesn't correlate with expected ISE operations
• Implement network-based detection for any outbound connections from ISE appliances following administrative sessions

How to Mitigate CVE-2024-20469

Immediate Actions Required

• Review and verify the patch status of all Cisco ISE deployments in your environment
• Audit Administrator account access and ensure only authorized personnel have CLI access
• Implement strict access controls and multi-factor authentication for ISE administrative interfaces
• Monitor administrative CLI sessions for suspicious activity until patches are applied

Patch Information

Cisco has released security patches to address this vulnerability. Organizations should consult the Cisco Security Advisory for specific patched versions and upgrade instructions.

For Cisco ISE 3.2.0, upgrade to Patch 7 or later. For Cisco ISE 3.3.0, upgrade to Patch 4 or later. Refer to the official Cisco advisory for the most current patch information and installation guidance.

Workarounds

• Restrict CLI access to the minimum number of trusted administrators required
• Implement jump servers or privileged access management solutions to control and audit CLI sessions
• Use network segmentation to limit access to ISE management interfaces
• Enable enhanced logging and monitoring as a compensating control until patches can be applied

# Verify current Cisco ISE version
show version

# Check for available updates
show application status ise

# Review administrative accounts
show running-config | include admin