CVE-2006-4316 in SSH Tectia Management Agent
Summary
by MITRE
SSH Tectia Management Agent 2.1.2 allows local users to gain root privileges by running a program called sshd, which is obtained from a process listing when the "Restart" action is selected from the Management server GUI, which causes the agent to locate the pathname of the user s program and restart it with root privileges.
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Analysis
by VulDB Data Team • 09/21/2017
The vulnerability described in CVE-2006-4316 represents a critical privilege escalation flaw within SSH Tectia Management Agent version 2.1.2. This issue stems from improper privilege handling during the restart operation of the SSH daemon process through the graphical user interface. The vulnerability allows local attackers to escalate their privileges from standard user level to root access, creating a significant security risk for systems utilizing this management agent.
The technical root cause of this vulnerability lies in the insecure execution of system processes within the management agent's restart functionality. When users select the "Restart" action from the Management server GUI, the agent performs a process lookup to locate the sshd program. However, the agent fails to properly validate or sanitize the program path, allowing an attacker to manipulate the system's PATH environment variable or replace the legitimate sshd binary with a malicious executable. This flaw directly violates the principle of least privilege and demonstrates a critical failure in privilege separation mechanisms. The vulnerability is classified as a privilege escalation issue under CWE-269, which specifically addresses inadequate privileges for system resources.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it provides attackers with complete system control. Once an attacker gains root privileges through this method, they can modify system files, install backdoors, exfiltrate sensitive data, and establish persistent access to the compromised system. The attack vector is particularly concerning because it leverages the legitimate management interface, making it difficult to detect through normal security monitoring. This vulnerability aligns with ATT&CK technique T1068, which covers 'Local Privilege Escalation' through exploitation of system configuration flaws. The ease of exploitation through a simple GUI interaction means that even less technically skilled attackers can leverage this vulnerability effectively.
Mitigation strategies for this vulnerability should focus on immediate patching of the SSH Tectia Management Agent to version 2.1.3 or later, which contains the necessary fixes for this privilege escalation issue. System administrators should also implement strict process monitoring and integrity checking mechanisms to detect unauthorized modifications to critical system binaries. Additionally, the principle of least privilege should be enforced by ensuring that the management agent runs with minimal required permissions and that process execution paths are properly validated. Network segmentation and access controls should be implemented to limit exposure of the management interface to trusted users only. Regular security audits and vulnerability assessments should be conducted to identify similar privilege escalation vectors within the system infrastructure. Organizations should also consider implementing application whitelisting policies to prevent execution of unauthorized binaries, particularly in critical system directories where the sshd binary resides. The vulnerability demonstrates the importance of proper input validation and privilege handling in management interfaces, emphasizing that administrative tools must be designed with security in mind to prevent attackers from exploiting seemingly benign operations.