CVE-2006-5557 in HP-UX
Summary
by MITRE
Stack-based buffer overflow in the (1) swpackage and (2) swmodify commands in HP-UX B.11.11 and possibly other versions allows local users to execute arbitrary code via a long -S argument. NOTE: this might be a duplicate of CVE-2006-2574, but the details relating to CVE-2006-2574 are too vague to be certain.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability described in CVE-2006-5557 represents a critical stack-based buffer overflow affecting HP-UX B.11.11 systems and potentially other versions of the operating system. This flaw specifically impacts two system administration commands: swpackage and swmodify, which are integral components of HP-UX software management utilities. The vulnerability arises from insufficient input validation when processing command-line arguments, particularly the -S argument that is commonly used in these administrative functions. The buffer overflow occurs when a local user provides an excessively long argument string to either of these commands, causing memory corruption that can be exploited to execute arbitrary code with elevated privileges.
The technical nature of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations on the stack. The flaw demonstrates how command-line argument processing can become a vector for privilege escalation attacks, as local users who can execute these commands gain the ability to manipulate memory layout and potentially overwrite return addresses or other critical stack variables. The attack vector is particularly concerning because it requires only local access to the system, making it accessible to users who may not have administrative privileges initially. The vulnerability's impact is amplified by the fact that these are standard system administration tools that typically run with elevated privileges, creating a pathway for privilege escalation from user-level to root-level access.
From an operational perspective, this vulnerability presents significant risk to HP-UX systems deployed in enterprise environments where local user access might be more prevalent than anticipated. The attack requires local system access, which means that users who have legitimate access to perform system administration tasks can potentially exploit this weakness to gain unauthorized elevated privileges. This creates a particular concern in multi-user environments where system administrators might be running these commands with elevated privileges, and where users with minimal access could leverage this vulnerability to escalate their privileges. The potential for privilege escalation means that an attacker could gain complete control over the system, potentially leading to data theft, system compromise, or further lateral movement within the network infrastructure.
Security mitigations for this vulnerability should focus on immediate patching of affected HP-UX systems through official HP security updates or service packs that address the buffer overflow in the swpackage and swmodify commands. System administrators should implement strict access controls and privilege separation to minimize the risk of local users exploiting this vulnerability, particularly in environments where the commands are frequently used with elevated privileges. Additionally, monitoring for unusual command-line arguments or patterns of execution involving these commands can help detect potential exploitation attempts. The vulnerability's classification as a local privilege escalation issue makes it particularly important to enforce principle of least privilege, ensuring that users only have access to administrative commands when absolutely necessary. Organizations should also consider implementing application whitelisting or sandboxing techniques for system administration utilities to prevent exploitation even if the underlying vulnerability cannot be immediately patched.
The relationship between CVE-2006-5557 and CVE-2006-2574 suggests a pattern of similar vulnerabilities in HP-UX software management tools, indicating that multiple command-line argument processing functions may be susceptible to similar buffer overflow conditions. This pattern reflects common security weaknesses in legacy system administration tools where input validation was not adequately implemented. The vulnerability's impact extends beyond immediate privilege escalation to potentially compromise system integrity and availability, as attackers could use the arbitrary code execution capability to install backdoors or disable security mechanisms. Given the age of the affected systems and the nature of the vulnerability, organizations should also consider implementing network segmentation and monitoring solutions to detect and prevent exploitation attempts, particularly in environments where legacy systems continue to operate without proper patch management.