CVE-2022-31749: WatchGuard Fireware Path Traversal Flaw

CVE-2022-31749 Overview

An argument injection vulnerability exists in the diagnose and import pac commands in WatchGuard Fireware OS. This flaw allows an authenticated remote attacker with unprivileged credentials to upload or read files to limited, arbitrary locations on WatchGuard Firebox and XTM appliances. The vulnerability affects versions before 12.8.1, 12.1.4, and 12.5.10.

Critical Impact

Authenticated attackers can exploit argument injection in diagnostic commands to perform unauthorized file read and write operations on WatchGuard firewall appliances, potentially leading to configuration theft or malicious file placement.

Affected Products

• WatchGuard Fireware OS before version 12.8.1
• WatchGuard Fireware OS before version 12.1.4
• WatchGuard Fireware OS before version 12.5.10
• WatchGuard Firebox appliances
• WatchGuard XTM appliances

Discovery Timeline

• 2025-01-28 - CVE CVE-2022-31749 published to NVD
• 2025-01-28 - Last updated in NVD database

Technical Details for CVE-2022-31749

Vulnerability Analysis

This vulnerability is classified as CWE-88 (Improper Neutralization of Argument Delimiters in a Command), commonly known as argument injection. The flaw exists within the diagnose and import pac commands available through the WatchGuard Fireware OS management interface. When authenticated users execute these commands, the system fails to properly sanitize or validate command-line arguments, allowing malicious actors to inject additional arguments that alter the intended behavior of the underlying operations.

The vulnerability requires network access and authenticated credentials to exploit, though even unprivileged user accounts can leverage this weakness. While the scope is limited to the vulnerable system itself, successful exploitation enables attackers to read sensitive configuration files or write malicious files to specific locations on the appliance. This could facilitate further attacks, including persistence mechanisms or extraction of sensitive security configurations from the firewall.

Root Cause

The root cause lies in improper neutralization of argument delimiters within the diagnose and import pac command handlers. User-supplied input is passed to underlying system commands without adequate sanitization, allowing attackers to inject additional arguments. The command parsing logic fails to properly escape or validate special characters and argument separators, enabling manipulation of the command execution flow.

Attack Vector

The attack is conducted remotely over the network by an authenticated user. The attacker must first obtain valid credentials for the WatchGuard appliance, even with minimal privileges. Once authenticated, the attacker crafts malicious input to the vulnerable diagnose or import pac commands, injecting additional arguments that redirect file operations to arbitrary locations. This allows reading sensitive files from the system or writing attacker-controlled content to specific paths on the appliance.

The vulnerability mechanism involves supplying specially crafted arguments that break out of the intended command context. For detailed technical analysis, refer to the Rapid7 Blog Post which provides in-depth coverage of the exploitation mechanics.

Detection Methods for CVE-2022-31749

Indicators of Compromise

• Unusual file access patterns in WatchGuard system logs, particularly involving the diagnose or import pac commands
• Unexpected files appearing in restricted directories on the appliance
• Authentication events followed by suspicious command execution from low-privilege accounts
• Log entries showing abnormal argument patterns or special characters in diagnostic commands

Detection Strategies

• Monitor WatchGuard appliance logs for commands containing unexpected argument sequences or path traversal patterns
• Implement alerting on diagnose and import pac command usage, especially from accounts that would not normally use these functions
• Deploy network monitoring to detect anomalous traffic patterns to the WatchGuard management interface
• Review user account activity for privilege abuse patterns

Monitoring Recommendations

• Enable verbose logging on WatchGuard Firebox and XTM appliances to capture detailed command execution records
• Configure SIEM integration to correlate authentication events with subsequent command execution
• Establish baseline behavior for administrative command usage to identify anomalies
• Regularly audit files in sensitive directories for unauthorized modifications

How to Mitigate CVE-2022-31749

Immediate Actions Required

• Update WatchGuard Fireware OS to version 12.8.1, 12.1.4, or 12.5.10 or later immediately
• Review and restrict access to the WatchGuard management interface to trusted networks only
• Audit user accounts and remove unnecessary privileged access from the appliance
• Monitor for any signs of exploitation in historical logs

Patch Information

WatchGuard has released patched versions of Fireware OS that address this vulnerability. Organizations should upgrade to version 12.8.1, 12.1.4, or 12.5.10 or later depending on their current branch. Detailed patch information is available in the WatchGuard Security Advisory.

Workarounds

• Restrict management interface access to trusted internal networks or VPN-only connections until patching is complete
• Implement network segmentation to limit exposure of WatchGuard management interfaces
• Enable multi-factor authentication for all administrative access to the appliance
• Reduce the number of user accounts with access to diagnostic commands

# Restrict management interface access (example network ACL)
# Apply on upstream network devices or WatchGuard policy configuration
# Limit access to specific trusted administrator IP ranges
# Consult WatchGuard documentation for specific configuration syntax