CVE-2006-5452 in HP-UX
Summary
by MITRE
Buffer overflow in dtmail on HP Tru64 UNIX 4.0F through 5.1B and HP-UX B.11.00 through B.11.23 allows local users to execute arbitrary code via a long -a (aka attachment) argument.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability described in CVE-2006-5452 represents a critical buffer overflow condition within the dtmail application on HP Tru64 UNIX and HP-UX operating systems. This flaw affects a wide range of system versions including HP Tru64 UNIX 4.0F through 5.1B and HP-UX B.11.00 through B.11.23, making it a significant security concern for organizations running these legacy systems. The buffer overflow occurs specifically when processing the -a command line argument, which is used to specify email attachments within the dtmail utility. This particular implementation flaw demonstrates poor input validation and memory management practices that have been identified as common vectors for privilege escalation attacks.
The technical nature of this vulnerability stems from inadequate bounds checking within the dtmail application's handling of the attachment argument parameter. When a local user provides an excessively long string as the -a argument, the application fails to properly validate the input length against the allocated buffer space, resulting in a classic stack-based buffer overflow condition. This overflow allows malicious input to overwrite adjacent memory locations including return addresses and control data, potentially enabling an attacker to inject and execute arbitrary code with the privileges of the running dtmail process. The vulnerability is classified as a buffer overflow under CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows for memory corruption. The attack vector is local in nature, meaning that exploitation requires the attacker to already have access to the system, but the privilege escalation potential makes this particularly dangerous in environments where users may have legitimate access to the mail utility.
The operational impact of this vulnerability extends beyond simple code execution, as it provides a potential pathway for attackers to gain elevated privileges and compromise system integrity. Local users who can manipulate the dtmail application through the attachment argument can potentially escalate their privileges to those of the mail service or even root access, depending on the system configuration and the privileges under which dtmail operates. The attack surface is particularly concerning given that dtmail is a standard component in HP-UX environments and may be accessible to regular users who require email functionality. This vulnerability aligns with ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation' and specifically addresses the use of local privilege escalation techniques through buffer overflow exploitation. Organizations running affected systems face the risk of unauthorized access, data compromise, and potential system takeover, especially in environments where local user access is not properly restricted.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected systems through official HP security updates, as the vulnerability has been addressed in subsequent releases of the operating systems. System administrators should implement strict input validation measures and consider disabling unnecessary email functionality where possible. Additional protective measures include implementing privilege separation for email applications, monitoring for unusual command line arguments, and conducting regular security audits of system components. The vulnerability demonstrates the importance of proper input validation and memory management practices in preventing exploitation of buffer overflow conditions, aligning with security best practices outlined in various cybersecurity frameworks including NIST SP 800-144 and ISO 27001 standards for secure system development and maintenance. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts.