CVE-2024-20324: Cisco IOS XE Privilege Escalation Flaw

CVE-2024-20324 Overview

A privilege escalation vulnerability exists in the Command Line Interface (CLI) of Cisco IOS XE Software that could allow an authenticated, low-privileged, local attacker to access WLAN configuration details including sensitive passwords. This vulnerability stems from improper privilege checks within the CLI command handling, enabling unauthorized access to protected configuration data through the show and show tech wireless commands.

Critical Impact

Low-privileged local attackers can extract WLAN passwords and configuration details, potentially compromising wireless network security and enabling further lateral movement.

Affected Products

• Cisco IOS XE versions 16.10.1 through 16.12.8
• Cisco IOS XE versions 17.1.1 through 17.12.1
• Cisco IOS XE Wireless LAN Controller (WLC) deployments

Discovery Timeline

• 2024-03-27 - CVE-2024-20324 published to NVD
• 2025-07-30 - Last updated in NVD database

Technical Details for CVE-2024-20324

Vulnerability Analysis

This vulnerability represents a broken access control issue (CWE-274: Improper Handling of Insufficient Privileges) in Cisco IOS XE Software's CLI. The core problem lies in how the system validates user privilege levels when processing certain wireless-related CLI commands. When a low-privileged user executes specific show commands targeting wireless configuration, the system fails to properly verify that the requesting user has sufficient authorization to view sensitive configuration elements like WLAN passwords.

The vulnerability requires local access and valid credentials, meaning an attacker must already have some level of authenticated access to the device. However, even with minimal privileges, they can leverage this flaw to access configuration details that should be restricted to higher privilege levels, representing a vertical privilege escalation scenario.

Root Cause

The root cause is improper privilege checking in the CLI command parser for wireless-related show commands. When the IOS XE software processes show and show tech wireless CLI commands, it fails to adequately validate whether the authenticated user's privilege level permits access to sensitive wireless configuration data, including stored passwords. This oversight allows users with lower privilege levels to bypass intended access controls and retrieve information normally restricted to administrators.

Attack Vector

The attack requires local authenticated access to the Cisco IOS XE device CLI. An attacker with low-privileged credentials (such as a network operator or help desk user with limited CLI access) can exploit this vulnerability by:

1. Authenticating to the device CLI with their low-privilege credentials
2. Executing wireless configuration show commands such as show wireless or show tech wireless
3. Viewing WLAN configuration details including passwords that should be restricted to privileged administrators

The attack does not require any user interaction and can be executed entirely through standard CLI commands. The vulnerability provides read-only access to sensitive configuration data without requiring any modification to system files or exploitation of memory corruption issues.

Detection Methods for CVE-2024-20324

Indicators of Compromise

• Unusual or frequent execution of show wireless or show tech wireless commands by low-privileged user accounts
• AAA accounting logs showing wireless configuration queries from accounts that should not have access to such data
• Multiple CLI sessions from user accounts attempting to access various configuration areas they are not authorized to view
• Command history showing pattern of enumeration across wireless configuration elements

Detection Strategies

• Enable AAA command accounting to log all CLI commands executed by users and review for unauthorized wireless configuration queries
• Implement TACACS+ with command authorization to restrict access to sensitive show commands based on user privilege levels
• Configure syslog monitoring to alert on wireless configuration access attempts by non-administrative users
• Deploy SentinelOne Singularity for network device behavioral monitoring to detect anomalous command patterns

Monitoring Recommendations

• Review AAA accounting logs regularly for show wireless and show tech wireless command execution by low-privileged users
• Monitor for bulk configuration retrieval attempts or systematic enumeration of wireless settings
• Implement real-time alerting for any wireless configuration access outside of documented change windows
• Audit user privilege assignments to ensure proper access control alignment with job responsibilities

How to Mitigate CVE-2024-20324

Immediate Actions Required

• Apply the security patch from Cisco as documented in the Cisco Security Advisory
• Audit all user accounts with CLI access to verify appropriate privilege levels are assigned
• Implement TACACS+ command authorization to restrict access to wireless show commands for low-privileged users
• Consider rotating WLAN passwords as a precaution if exploitation is suspected or cannot be ruled out

Patch Information

Cisco has released security updates to address this vulnerability. Organizations should consult the Cisco Security Advisory for specific fixed software versions and upgrade guidance. The advisory (cisco-sa-iosxe-wlc-privesc-RjSMrmPK) provides detailed information about affected and fixed releases across all impacted version trains from 16.10.x through 17.12.x.

Workarounds

• Implement TACACS+ with explicit command authorization policies to restrict wireless show commands to authorized administrators only
• Use privilege level restrictions to limit CLI command access based on user roles
• Remove CLI access from accounts that do not require direct device management capabilities
• Consider using network management platforms instead of direct CLI access for routine monitoring tasks

# Example TACACS+ command authorization configuration
aaa new-model
aaa authorization commands 1 default group tacacs+ local
aaa authorization commands 15 default group tacacs+ local

# Restrict show wireless commands at privilege level 15 only
privilege exec level 15 show wireless
privilege exec level 15 show tech-support wireless