CVE-2008-6558 in UnixWare
Summary
by MITRE
Untrusted search path vulnerability in (1) hvdisp and (2) rcvm in ReliantHA 1.1.4 in SCO UnixWare 7.1.4 allows local users to gain root privileges by modifying the RELIANT_PATH environment variable to point to a malicious bin/hvenv program.
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Analysis
by VulDB Data Team • 10/20/2024
The vulnerability identified as CVE-2008-6558 represents a critical untrusted search path flaw affecting SCO UnixWare 7.1.4 systems running ReliantHA 1.1.4 software. This issue manifests in two distinct components hvdisp and rcvm which are part of the ReliantHA high availability framework designed to manage system services and failover operations. The vulnerability stems from improper handling of environment variables during program execution, specifically the RELIANT_PATH variable that controls the search path for critical system components. When local users manipulate this environment variable to point to malicious executables, they can effectively bypass normal security controls and escalate their privileges to root level access.
This type of vulnerability falls under the CWE-426 Untrusted Search Path category, which describes situations where programs search for executables or libraries using paths that can be manipulated by attackers. The flaw exploits the fundamental principle of least privilege by allowing unauthorized users to inject malicious code into the system's execution flow. The specific attack vector involves the manipulation of the RELIANT_PATH environment variable to redirect program execution toward a crafted bin/hvenv program that has been placed in a location under the attacker's control. This vulnerability is particularly dangerous because it leverages legitimate system components to achieve privilege escalation rather than exploiting direct code execution flaws.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to gain complete system control over UnixWare 7.1.4 environments running ReliantHA. Once root privileges are obtained, attackers can modify system files, install persistent backdoors, access sensitive data, and potentially compromise other systems within the network that rely on the compromised UnixWare host. The vulnerability affects the integrity and confidentiality of the entire system, as the attacker can manipulate system configurations and access privileged information. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques using environment variables and path manipulation, specifically covering techniques such as T1068 (Local Port Forwarding) and T1548.001 (Abuse Elevation Control Mechanism).
Mitigation strategies for CVE-2008-6558 should focus on several key areas including immediate patching of the affected SCO UnixWare systems with the latest security updates from SCO, implementation of proper environment variable validation within the ReliantHA applications, and enforcement of strict file permissions on system directories. System administrators should also implement monitoring for unauthorized modifications to critical environment variables and establish regular security audits to detect potential exploitation attempts. The vulnerability highlights the importance of secure coding practices and proper input validation in system-level applications. Additionally, organizations should consider implementing principle of least privilege access controls and regular security assessments to identify similar vulnerabilities in other system components. The attack scenario demonstrates the critical need for proper environment variable handling in enterprise systems and the potential consequences when such controls are absent.