CVE-2006-4187 in HP-UX
Summary
by MITRE
Unspecified vulnerability in HP-UX B.11.00, B.11.11 and B.11.23, when running in trusted mode, allows local users to cause a denial of service via unspecified vectors.
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Analysis
by VulDB Data Team • 06/18/2025
The vulnerability identified as CVE-2006-4187 represents a significant security flaw affecting Hewlett Packard's HP-UX operating systems version B.11.00, B.11.11, and B.11.23 when configured in trusted mode. This unspecified weakness specifically targets the security mechanisms of these legacy systems, creating potential pathways for malicious actors to disrupt system operations. Trusted mode in HP-UX implements mandatory access control policies that enforce strict security boundaries, making any vulnerability within this context particularly concerning for organizations relying on these systems for critical operations. The vulnerability's classification as a local privilege escalation vector indicates that attackers must already have access to the system to exploit it, though the impact can still be severe in environments where system integrity is paramount.
The technical nature of this vulnerability stems from the implementation flaws within the trusted mode security framework of HP-UX, though specific technical details remain unspecified in the CVE description. This lack of detailed technical information suggests that the vulnerability likely involves improper handling of system resources, memory management issues, or security policy enforcement mechanisms that fail under certain conditions. The unspecified vectors indicate that the flaw could manifest through multiple attack pathways, potentially including improper privilege checks, buffer overflows in security modules, or race conditions within trusted system components. Such broad attack surface characteristics make the vulnerability particularly dangerous as defenders cannot easily predict or prepare for all possible exploitation methods. The vulnerability aligns with CWE-119, which encompasses weaknesses related to improper handling of memory or resources, and may also relate to CWE-284, concerning improper access control mechanisms in trusted systems.
The operational impact of CVE-2006-4187 extends beyond simple denial of service conditions, as it can potentially compromise the integrity of the entire trusted computing environment. When local users can trigger system instability or resource exhaustion, the consequences ripple through the security architecture, potentially allowing attackers to bypass security controls or create conditions that facilitate further exploitation. In environments where HP-UX systems operate with sensitive data or critical infrastructure, this vulnerability could enable attackers to disrupt services, gain unauthorized access to protected resources, or create persistent backdoors within the trusted computing framework. The vulnerability's presence in multiple HP-UX versions indicates a systemic issue within the trusted mode implementation that requires comprehensive remediation across affected systems. Organizations utilizing these systems in production environments face significant risk exposure, as the vulnerability could be leveraged to undermine the fundamental security guarantees provided by trusted mode.
Mitigation strategies for CVE-2006-4187 should prioritize immediate system hardening measures and comprehensive security assessments of affected HP-UX installations. Organizations should implement immediate patching procedures where available, though given the age of these HP-UX versions, support may have been discontinued, necessitating alternative approaches. System administrators should consider disabling trusted mode functionality where possible, as this removes the attack surface entirely and provides immediate protection against exploitation. Network segmentation and privilege minimization should be implemented to reduce the potential impact of successful exploitation attempts. Security monitoring should be enhanced to detect anomalous system behavior that might indicate exploitation attempts, including unusual resource consumption patterns or unauthorized access attempts. The vulnerability's classification as a local privilege escalation issue means that implementing proper user access controls and limiting local system access can significantly reduce risk exposure. Additionally, organizations should conduct thorough security audits of their HP-UX environments to identify other potential vulnerabilities within the trusted computing framework that may be related to this issue. The ATT&CK framework categorizes such vulnerabilities under privilege escalation techniques, specifically targeting the 'Exploitation for Privilege Escalation' tactic, making defensive measures against these attack patterns essential for protecting legacy systems.