CVE-2022-21132 in pfSense-pkg-WireGuard
Summary
by MITRE • 03/10/2022
Directory traversal vulnerability in pfSense-pkg-WireGuard pfSense-pkg-WireGuard 0.1.5 versions prior to 0.1.5_4 and pfSense-pkg-WireGuard 0.1.6 versions prior to 0.1.6_1 allows a remote authenticated attacker to lead a pfSense user to view a file outside the public folder.
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Analysis
by VulDB Data Team • 03/13/2022
The directory traversal vulnerability identified as CVE-2022-21132 affects the pfSense-pkg-WireGuard package, a critical component for network security infrastructure management. This vulnerability exists within versions 0.1.5 prior to 0.1.5_4 and 0.1.6 prior to 0.1.6_1, representing a significant security flaw that undermines the integrity of pfSense network appliances. The vulnerability specifically targets the file handling mechanisms within the WireGuard package, creating an exploitable condition that allows remote authenticated attackers to manipulate file access paths.
The technical flaw stems from insufficient input validation and sanitization within the file access routines of the WireGuard package implementation. When authenticated users interact with the package's web interface, the application fails to properly validate file path parameters, enabling attackers to craft malicious requests that traverse directory structures beyond the intended public folder boundaries. This vulnerability operates under CWE-22, which categorizes directory traversal attacks as path traversal flaws that allow attackers to access files outside the designated directory. The flaw represents a classic case of inadequate access control and input validation, where user-supplied data is directly incorporated into file system operations without proper sanitization.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it provides attackers with potential access to sensitive configuration files, logs, and other system resources that should remain protected within the pfSense appliance's security boundaries. A successful exploitation could lead to information disclosure, privilege escalation, or even system compromise depending on the specific files accessible through the traversal path. The remote authentication requirement means that attackers must first establish valid credentials, but this does not significantly mitigate the risk given that pfSense appliances often serve as critical network infrastructure components where credential compromise can have widespread consequences.
Security professionals should note that this vulnerability aligns with ATT&CK technique T1078 which covers legitimate credentials and valid accounts as a means of gaining access to systems. The affected pfSense appliances represent critical network infrastructure where such vulnerabilities can be exploited to undermine network security posture. Organizations using affected versions of pfSense-pkg-WireGuard should immediately implement the vendor-provided patches and updates to address this directory traversal vulnerability. The remediation process involves upgrading to versions 0.1.5_4 or 0.1.6_1, which contain the necessary code modifications to properly validate and sanitize file path parameters, preventing unauthorized directory traversal operations.
Mitigation strategies should include network segmentation to limit access to pfSense appliances, implementing robust monitoring for suspicious file access patterns, and conducting thorough security assessments of all network infrastructure components. The vulnerability demonstrates the critical importance of input validation in web applications and the potential consequences of inadequate security controls in network management systems. Organizations should also consider implementing additional security controls such as web application firewalls and access control lists to provide defense-in-depth against similar vulnerabilities in other network management components. Regular vulnerability scanning and security assessments remain essential practices for maintaining network infrastructure security posture.