CVE-2022-4968 in Netplan
Summary
by MITRE • 06/07/2024
netplan leaks the private key of wireguard to local users. Versions after 1.0 are not affected.
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Analysis
by VulDB Data Team • 02/25/2025
The vulnerability identified as CVE-2022-4968 represents a critical security flaw in the netplan network configuration tool that affects versions prior to 1.0. This issue specifically impacts wireguard network interfaces where the private key material becomes accessible to local users through improper file permissions and access control mechanisms. The vulnerability stems from the improper handling of sensitive cryptographic materials during network configuration processes, creating an unauthorized access vector that compromises the confidentiality of wireguard private keys.
The technical implementation of this flaw occurs within the netplan configuration management system where wireguard private keys are stored in configuration files or temporary locations with insufficient access controls. Local users with appropriate privileges can directly read these configuration files and extract the private key material, which fundamentally undermines the security model of wireguard networks. The vulnerability is particularly concerning because wireguard private keys are essential cryptographic components that, when exposed, allow attackers to establish unauthorized connections and potentially decrypt network traffic. This issue aligns with CWE-276, which addresses improper file permissions and inadequate access control mechanisms.
From an operational perspective, this vulnerability creates significant risks for systems relying on wireguard for secure network communications. Attackers with local access can exploit this flaw to gain unauthorized network access, potentially leading to lateral movement within networks, data exfiltration, or complete compromise of the affected systems. The impact extends beyond individual machines to potentially compromise entire network infrastructures where wireguard is used for site-to-site connections or remote access. This vulnerability also impacts the principle of least privilege and violates security best practices for handling sensitive cryptographic materials, making it particularly dangerous in multi-tenant or shared hosting environments.
The mitigation strategy for CVE-2022-4968 involves upgrading to netplan version 1.0 or later where the issue has been resolved through proper access control implementation. System administrators should immediately assess their network configurations and ensure that wireguard private keys are not exposed to local users through file permissions or configuration management processes. Additional defensive measures include implementing proper file access controls, monitoring for unauthorized access attempts, and conducting regular security audits of network configuration files. This vulnerability also highlights the importance of secure configuration management practices and aligns with ATT&CK technique T1566 which covers credential access through compromised network infrastructure. Organizations should also consider implementing network segmentation and monitoring to detect potential exploitation attempts and ensure that cryptographic materials are properly protected throughout their lifecycle.