CVE-2024-5916: PAN-OS Information Disclosure Vulnerability

CVE-2024-5916 Overview

An information exposure vulnerability exists in Palo Alto Networks PAN-OS software that enables a local system administrator to unintentionally disclose secrets, passwords, and tokens of external systems. A read-only administrator who has access to the config log can read secrets, passwords, and tokens to external systems, potentially leading to unauthorized access to connected infrastructure.

Critical Impact

Sensitive credentials including secrets, passwords, and tokens for external systems may be exposed to read-only administrators through config log access, potentially compromising connected systems and services.

Affected Products

• Palo Alto Networks PAN-OS (multiple versions)
• PAN-OS firewall appliances with config log access enabled
• Network environments utilizing PAN-OS with external system integrations

Discovery Timeline

• 2024-08-14 - CVE-2024-5916 published to NVD
• 2024-08-20 - Last updated in NVD database

Technical Details for CVE-2024-5916

Vulnerability Analysis

This vulnerability is classified under CWE-312 (Cleartext Storage of Sensitive Information) and CWE-313 (Cleartext Storage in a File or on Disk). The core issue lies in how PAN-OS handles sensitive credential data within configuration logs.

When administrators configure integrations with external systems, the credentials used for authentication—including secrets, passwords, and tokens—are written to configuration logs in a manner that allows them to be read by users with read-only administrative privileges. This represents a significant breach of the principle of least privilege, as read-only administrators should not have access to authentication credentials.

The vulnerability is particularly concerning in environments where role separation is implemented, as organizations may grant read-only access to administrators for troubleshooting or auditing purposes without intending to expose credential information.

Root Cause

The root cause of this vulnerability stems from improper handling of sensitive information in PAN-OS configuration logs. When external system credentials are processed, the logging mechanism fails to properly redact or encrypt these values before writing them to log files. This results in cleartext storage of sensitive authentication data that becomes accessible to any administrator with config log read permissions.

The vulnerability indicates a lack of proper data classification and protection controls within the logging subsystem, where credential data is not differentiated from other configuration parameters that may legitimately need to be logged for audit purposes.

Attack Vector

The attack vector requires network access with high privileges (administrative credentials). An attacker or malicious insider with read-only administrative access to a PAN-OS device can exploit this vulnerability through the following scenario:

1. The attacker gains or is granted read-only administrative access to the PAN-OS management interface
2. The attacker navigates to or exports configuration logs
3. The attacker searches the logs for entries related to external system integrations
4. Secrets, passwords, and tokens for external systems are extracted from the log entries
5. The attacker uses the harvested credentials to access the external systems

This vulnerability does not require user interaction for exploitation once administrative access is obtained, though it does require some form of user participation in the configuration logging workflow.

Detection Methods for CVE-2024-5916

Indicators of Compromise

• Unusual access patterns to configuration logs by read-only administrators
• Bulk export or download of configuration log files
• Login attempts to external integrated systems from unexpected sources using valid credentials
• Anomalous administrative session activity focusing on log retrieval functions

Detection Strategies

• Monitor and audit all access to PAN-OS configuration logs, particularly by read-only administrative accounts
• Implement behavioral analytics to detect unusual patterns of log file access
• Enable and review authentication logs on external systems integrated with PAN-OS for suspicious access
• Deploy network traffic analysis to identify credential reuse attacks against external systems

Monitoring Recommendations

• Configure alerting for any read-only administrator access to sensitive configuration areas
• Implement log aggregation and SIEM integration for PAN-OS management plane activities
• Establish baseline access patterns for legitimate administrative activities to detect anomalies
• Review external system access logs for authentication attempts that correlate with PAN-OS log access events

How to Mitigate CVE-2024-5916

Immediate Actions Required

• Review and restrict read-only administrative access to minimize exposure
• Audit which administrators have accessed configuration logs and when
• Rotate credentials for all external systems integrated with affected PAN-OS devices
• Implement network segmentation to limit access to the PAN-OS management interface

Patch Information

Palo Alto Networks has released security updates to address this vulnerability. Organizations should apply the latest PAN-OS updates as soon as possible. Detailed patch information and affected version specifics are available in the Palo Alto Networks Security Advisory.

After applying patches, administrators should:

1. Verify the update was applied successfully
2. Rotate all credentials for external system integrations
3. Review configuration logs to assess potential exposure

Workarounds

• Limit read-only administrative access to only essential personnel until patches are applied
• Implement additional access controls and monitoring on config log access
• Consider disabling detailed configuration logging temporarily if operationally feasible
• Rotate credentials for external systems on a regular basis as a precautionary measure
• Use network access controls to restrict management interface access to trusted networks only

# Example: Review PAN-OS administrative access (CLI)
# Check current administrative accounts and their privileges
show admins all

# Review recent configuration log access
less mp-log configd.log

# After patching, rotate external system credentials
# Consult Palo Alto Networks documentation for specific integration credential updates