CVE-2023-38046: PAN-OS Information Disclosure Vulnerability

CVE-2023-38046 Overview

A vulnerability exists in Palo Alto Networks PAN-OS software that enables an authenticated administrator with the privilege to commit a specifically created configuration to read local files and resources from the system. This vulnerability is classified as CWE-610 (Externally Controlled Reference to a Resource in Another Sphere), indicating improper control over external resource references.

Critical Impact

Authenticated administrators with configuration commit privileges can read arbitrary local files and system resources, potentially exposing sensitive configuration data, credentials, and system information.

Affected Products

• Palo Alto Networks PAN-OS (multiple versions)
• Palo Alto Networks PAN-OS 11.0.0
• Various PAN-OS versions prior to security patches

Discovery Timeline

• 2023-07-12 - CVE-2023-38046 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-38046

Vulnerability Analysis

This vulnerability affects the configuration commit functionality in Palo Alto Networks PAN-OS software. The flaw allows an authenticated administrator who has privileges to commit configurations to craft a specially designed configuration that, when committed, enables reading of local files and system resources that should otherwise be inaccessible.

The vulnerability stems from improper validation of externally controlled references within configuration elements. When an administrator crafts a malicious configuration payload and commits it to the firewall, the system processes these references without adequate sanitization, allowing access to files outside the intended scope.

This represents a significant information disclosure risk in enterprise environments where PAN-OS devices often contain sensitive network configurations, authentication credentials, and security policies. While requiring authenticated administrator access limits the attack surface, compromised administrator accounts or malicious insiders could leverage this vulnerability to extract sensitive data.

Root Cause

The root cause is classified under CWE-610: Externally Controlled Reference to a Resource in Another Sphere. The PAN-OS configuration commit process fails to properly validate and sanitize references to local resources embedded within configuration parameters. This allows an attacker with administrator privileges to specify paths to arbitrary local files, which are then processed by the system during configuration commit operations, resulting in unauthorized file access.

Attack Vector

The attack requires network access to the PAN-OS management interface and valid administrator credentials with configuration commit privileges. An attacker would:

1. Authenticate to the PAN-OS management interface with administrator credentials
2. Craft a specially designed configuration containing malicious resource references
3. Commit the configuration through the standard management interface
4. Extract the contents of targeted local files from the system response or logs

The attack does not require user interaction and can be performed by any authenticated administrator with commit privileges, making it a potential insider threat vector or post-exploitation technique following credential compromise.

Detection Methods for CVE-2023-38046

Indicators of Compromise

• Unusual configuration commit activity from administrator accounts, particularly involving atypical configuration elements
• Log entries showing access to sensitive system files such as /etc/passwd, /etc/shadow, or configuration files outside normal operational scope
• Configuration commits containing suspicious file path references or directory traversal patterns
• Unexpected administrator session activity outside normal business hours

Detection Strategies

• Monitor PAN-OS system logs for configuration commit events that reference unusual file paths or system resources
• Implement behavioral analysis to detect administrators accessing files inconsistent with their typical operational patterns
• Deploy file integrity monitoring on PAN-OS systems to detect unauthorized access to sensitive configuration files
• Correlate authentication logs with configuration commit activity to identify anomalous patterns

Monitoring Recommendations

• Enable comprehensive logging for all configuration commit activities on PAN-OS devices
• Configure SIEM rules to alert on configuration commits containing potential file path indicators
• Implement real-time monitoring of administrator account activities across all PAN-OS management interfaces
• Regularly audit administrator privileges to ensure least-privilege access principles are enforced

How to Mitigate CVE-2023-38046

Immediate Actions Required

• Review and apply the latest security patches from Palo Alto Networks addressing CVE-2023-38046
• Audit all administrator accounts with configuration commit privileges and remove unnecessary access
• Monitor for any indicators of compromise on affected PAN-OS systems
• Implement network segmentation to restrict management interface access to trusted networks only

Patch Information

Palo Alto Networks has released security patches addressing this vulnerability. Organizations should consult the official Palo Alto Networks Security Advisory for specific version information and upgrade guidance. Apply the appropriate patches based on your current PAN-OS version deployment.

Workarounds

• Restrict management interface access to only essential administrator accounts using the principle of least privilege
• Implement multi-factor authentication for all administrator accounts accessing PAN-OS management interfaces
• Segment management networks to limit exposure of PAN-OS administrative interfaces
• Enable and monitor audit logging for all configuration changes until patches can be applied

# Configuration example - Restrict management access to trusted IP addresses
# From PAN-OS CLI:
set deviceconfig system permitted-ip <trusted-management-network>
commit