CVE-2024-20358 is a vulnerability identified in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software, specifically within the restore functionality. The root cause is improper neutralization of special elements in backup files during the restore process, leading to OS command injection. When an administrator restores a backup file, the software fails to properly sanitize the file contents, allowing crafted input to be interpreted as OS commands. This enables an authenticated local attacker with administrator privileges to execute arbitrary commands on the underlying Linux operating system with root-level privileges. The vulnerability affects a wide range of ASA software versions, from 9.8.x through 9.23.x, indicating a long-standing issue across multiple releases. Exploitation requires local access and administrator-level authentication, which limits the attack surface but does not eliminate risk given the critical nature of firewall devices. The vulnerability does not require user interaction beyond the restore operation. The CVSS v3.1 score is 6.0, reflecting medium severity due to the high impact on confidentiality and integrity but limited exploitability factors. No public exploits or active exploitation in the wild have been reported to date. The vulnerability could allow attackers to gain full control over the firewall device, potentially bypassing security controls, exfiltrating sensitive data, or disrupting network operations.

The impact of CVE-2024-20358 is significant for organizations relying on Cisco ASA and Firepower Threat Defense devices for network security. Successful exploitation grants root-level command execution on the firewall’s underlying Linux OS, effectively compromising the device’s confidentiality and integrity. Attackers could manipulate firewall configurations, disable security controls, intercept or redirect network traffic, and potentially pivot to other internal systems. Given the critical role of these devices in perimeter defense and VPN termination, compromise could lead to widespread network exposure and data breaches. However, the requirement for administrator-level authentication and local access reduces the likelihood of remote exploitation by external attackers. Insider threats or attackers who have already gained administrative credentials pose the greatest risk. The vulnerability could disrupt business continuity if exploited to alter firewall policies or cause device instability. Organizations with large deployments of Cisco ASA devices, especially in sectors like finance, government, and critical infrastructure, face heightened risk due to the strategic importance of these firewalls.

To mitigate CVE-2024-20358, organizations should immediately apply Cisco’s security patches or software updates addressing this vulnerability once available. Until patches are deployed, restrict restore operations to highly trusted administrators and limit physical or local access to firewall management interfaces. Implement strict access controls and multi-factor authentication for administrator accounts to reduce the risk of credential compromise. Audit and monitor restore activities and administrative actions on ASA devices for suspicious behavior. Consider isolating management networks to prevent unauthorized local access. Backup files should be validated and scanned before restoration to detect tampering. Additionally, employ network segmentation and intrusion detection systems to detect anomalous activities originating from firewall devices. Regularly review and update firewall software to the latest supported versions to benefit from security fixes. Finally, maintain an incident response plan tailored to firewall compromise scenarios to quickly contain and remediate potential breaches.