CVE-2009-3109 in Altiris Deployment Solution
Summary
by MITRE
Unspecified vulnerability in the AClient agent in Symantec Altiris Deployment Solution 6.9.x before 6.9 SP3 Build 430, when key-based authentication is being used between a deployment server and a client, allows remote attackers to bypass authentication and execute arbitrary commands as SYSTEM by spoofing the deployment server and sending "alternate commands" before the handshake is completed.
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Analysis
by VulDB Data Team • 03/01/2025
The vulnerability described in CVE-2009-3109 represents a critical authentication bypass flaw within Symantec Altiris Deployment Solution's AClient agent implementation. This issue specifically affects versions 6.9.x prior to 6.9 SP3 Build 430 and manifests when key-based authentication mechanisms are employed between deployment servers and client systems. The vulnerability stems from insufficient validation of the authentication handshake process, creating a window of opportunity for malicious actors to intercept and manipulate communication flows. The flaw operates by exploiting a timing vulnerability in the key-based authentication sequence, allowing attackers to spoof legitimate deployment servers and inject malicious commands before the proper authentication handshake completes. This represents a classic example of a man-in-the-middle attack vector where the attacker leverages the inherent weakness in the authentication protocol's temporal execution model.
The technical exploitation of this vulnerability involves a sophisticated attack pattern that aligns with attack techniques documented in the MITRE ATT&CK framework under the credential access and execution phases. The flaw operates at the network communication layer where the AClient agent fails to properly validate the authenticity of the deployment server during the initial handshake phase. This vulnerability directly maps to CWE-287, which describes improper authentication scenarios, and specifically relates to CWE-306, which addresses missing authentication in critical functions. The authentication bypass occurs because the system does not implement proper cryptographic validation of the server identity before accepting commands, allowing an attacker positioned within the network to intercept the initial authentication exchange and present a forged server identity. The attack requires the attacker to be positioned in a strategic network location to intercept and manipulate the communication flow, typically within the same network segment or through network interception capabilities.
The operational impact of this vulnerability is severe and potentially devastating for organizations relying on Symantec Altiris Deployment Solution for system management and deployment operations. When successfully exploited, attackers can execute arbitrary commands with SYSTEM privileges on target client systems, effectively granting them complete control over the compromised machines. This level of access enables attackers to perform various malicious activities including data exfiltration, system modification, privilege escalation, and persistent backdoor installation. The vulnerability's impact extends beyond individual compromised systems as it can potentially allow attackers to establish a foothold for broader network infiltration and lateral movement. Organizations utilizing key-based authentication for deployment management are particularly at risk since the attack leverages the very authentication mechanism designed to protect against unauthorized access. The vulnerability essentially undermines the security model of the deployment solution by allowing remote execution of commands without proper authentication verification.
Mitigation strategies for this vulnerability should focus on immediate patch deployment and network segmentation measures. The primary recommendation is to upgrade to Symantec Altiris Deployment Solution 6.9 SP3 Build 430 or later versions where the authentication bypass has been addressed through improved handshake validation mechanisms. Network administrators should also implement additional security controls including firewall rules to restrict communication between deployment servers and clients, and deploy network monitoring solutions to detect anomalous command execution patterns. The implementation of proper cryptographic validation of server identities during the initial handshake process should be enforced through network security policies. Organizations should also consider implementing network access controls and intrusion detection systems to monitor for potential exploitation attempts. From a compliance perspective, this vulnerability highlights the importance of maintaining up-to-date security patches and implementing proper network segmentation to limit the impact of successful exploitation attempts. The vulnerability serves as a reminder of the critical importance of robust authentication mechanisms and proper validation of identity claims in distributed deployment and management systems.