CVE-2024-20329 in ASA
Summary
by MITRE • 10/23/2024
A vulnerability in the SSH subsystem of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to execute operating system commands as root.
This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by submitting crafted input when executing remote CLI commands over SSH. A successful exploit could allow the attacker to execute commands on the underlying operating system with root-level privileges. An attacker with limited user privileges could use this vulnerability to gain complete control over the system.
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Analysis
by VulDB Data Team • 08/01/2025
The vulnerability identified as CVE-2024-20329 represents a critical security flaw within the SSH subsystem of Cisco Adaptive Security Appliance (ASA) Software, specifically targeting the command execution mechanisms that govern remote administrative access. This weakness resides in the insufficient validation of user input parameters, creating a pathway for authenticated remote attackers to escalate their privileges and execute arbitrary operating system commands with root-level authority. The vulnerability affects Cisco ASA software versions that implement SSH protocol for remote management, making it particularly concerning given the widespread deployment of these security appliances in enterprise network environments. The flaw demonstrates a classic command injection vulnerability pattern where improperly sanitized input allows attackers to manipulate the underlying operating system through the SSH interface.
The technical exploitation of CVE-2024-20329 occurs when an authenticated attacker submits maliciously crafted input during SSH sessions that execute remote CLI commands. This vulnerability stems from inadequate input sanitization mechanisms within the ASA's SSH implementation, allowing attackers to bypass normal command execution restrictions. The flaw specifically manifests when the system processes user-supplied arguments or parameters in SSH command contexts, where insufficient validation permits the injection of operating system commands that are subsequently executed with elevated privileges. This represents a privilege escalation vulnerability that transforms a limited user session into a root-level administrative access point. The vulnerability's impact extends beyond simple command execution as it provides attackers with complete control over the underlying operating system, enabling them to modify system configurations, access sensitive data, and potentially establish persistent access points within the network infrastructure.
The operational implications of CVE-2024-20329 are severe and multifaceted, as it fundamentally compromises the security posture of affected Cisco ASA appliances. An attacker who successfully exploits this vulnerability can assume complete administrative control over the device, potentially leading to unauthorized network access, data exfiltration, and disruption of security services. The vulnerability's remote exploitability means that attackers do not require physical access or local network presence to initiate the attack, making it particularly dangerous in environments where ASA appliances serve as primary security gateways. This flaw undermines the fundamental security model of network security appliances by allowing authenticated users to escalate their privileges beyond the intended scope of their access rights. The impact is further amplified by the potential for lateral movement within the network, as compromised ASA appliances often serve as critical security enforcement points that control traffic flow and access policies.
Organizations should implement immediate mitigation strategies to address CVE-2024-20329, beginning with applying the latest security patches released by Cisco to remediate the input validation deficiencies. Network administrators should also consider implementing additional access controls and monitoring mechanisms to detect anomalous SSH command patterns that might indicate exploitation attempts. The vulnerability aligns with CWE-77 and CWE-88 categories related to command injection and input validation failures, and corresponds to ATT&CK techniques such as privilege escalation and command and control operations. Security teams should conduct comprehensive vulnerability assessments of their ASA deployments to identify affected systems and establish monitoring protocols for suspicious command execution patterns. Additionally, implementing network segmentation and least privilege access models can help limit the potential impact should an attacker successfully exploit this vulnerability, while maintaining operational security through regular security audits and continuous monitoring of SSH sessions for abnormal behavior patterns.