CVE-2006-5091 in HP-UX
Summary
by MITRE
Unspecified vulnerability in HP-UX B.11.11 and B.11.23 CIFS Server (Samba) allows local users to gain privileges or obtain "unauthorized access" via unspecified vectors.
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Analysis
by VulDB Data Team • 04/23/2026
The vulnerability identified as CVE-2006-5091 represents a critical security flaw within the CIFS Server implementation on HP-UX operating systems, specifically affecting versions B.11.11 and B.11.23. This issue stems from an unspecified weakness in the Samba server component that forms the foundation of file sharing services within these enterprise environments. The vulnerability exists within the core networking protocols that enable file and printer sharing across Unix-based systems, creating potential attack vectors that could be exploited by malicious actors within the local network perimeter. The unspecified nature of the vulnerability vectors suggests that multiple attack surfaces may be compromised, making the assessment and remediation process more complex for security administrators. This type of vulnerability typically arises from inadequate input validation, improper privilege handling, or flawed access control mechanisms within the server implementation. The affected HP-UX systems represent enterprise-grade servers commonly used in business environments where file sharing and network resource access are critical components of operational infrastructure.
The technical flaw manifests as a privilege escalation opportunity or unauthorized access mechanism that local users can exploit to elevate their system privileges or gain access to restricted resources. This represents a significant security risk since local users typically have limited system access but can leverage this vulnerability to bypass normal security controls. The vulnerability likely involves improper handling of authentication tokens, insufficient validation of user permissions, or flawed privilege management within the Samba server processes. According to CWE classification, this vulnerability could map to multiple categories including CWE-264 for permissions, privileges, and access control issues, or CWE-20 for input validation problems that could lead to privilege escalation. The attack surface is particularly concerning because it affects the core file sharing infrastructure that many enterprise applications depend upon for data access and resource management. The local exploitation nature means that attackers do not require external network access, making the vulnerability more readily exploitable within internal network environments where trust relationships may exist between systems.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially compromise entire network file sharing infrastructures. Organizations relying on HP-UX B.11.11 and B.11.23 systems for CIFS services face significant risks including data theft, system compromise, and potential lateral movement within their network environments. The unauthorized access capability could enable attackers to read sensitive files, modify shared resources, or establish persistent access points within the network infrastructure. This vulnerability aligns with ATT&CK framework techniques such as privilege escalation and credential access, where local users can leverage system weaknesses to gain elevated privileges. The impact is particularly severe in enterprise environments where HP-UX servers often serve as central file sharing points for multiple departments or applications, potentially providing attackers with access to critical business data and operational resources. Organizations may experience service disruption, compliance violations, and potential regulatory penalties if this vulnerability is exploited successfully.
Mitigation strategies for CVE-2006-5091 should prioritize immediate patch deployment from HP-UX vendors, as this represents a known vulnerability that requires vendor-supplied security updates. System administrators should implement network segmentation to limit local access to critical systems, employ principle of least privilege configurations, and conduct thorough vulnerability assessments to identify any potential exploitation attempts. The remediation process should include disabling unnecessary CIFS services, monitoring system logs for suspicious authentication patterns, and implementing network access controls to prevent unauthorized local access. Security monitoring solutions should be configured to detect unusual privilege escalation attempts or unauthorized file access patterns that might indicate exploitation of this vulnerability. Organizations should also consider implementing additional security controls such as mandatory access controls, enhanced auditing mechanisms, and regular security assessments to identify similar vulnerabilities within their HP-UX environments. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing comprehensive security monitoring across all enterprise systems to prevent exploitation of known vulnerabilities in critical infrastructure components.