CVE-1999-0127 in HP-UX
Summary
by MITRE
swinstall and swmodify commands in sd-ux package in hp-ux systems allow local users to create or overwrite arbitrary files to gain root access.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 04/16/2026
The vulnerability identified as CVE-1999-0127 represents a critical privilege escalation flaw within the hp-ux operating system's software management utilities. This issue affects the swinstall and swmodify commands that are part of the sd-ux package, which are fundamental tools for managing software packages on hp-ux systems. The vulnerability stems from improper privilege handling within these administrative commands, creating a dangerous condition where local users can manipulate file creation and modification processes to gain elevated system privileges.
The technical flaw manifests through insufficient input validation and improper file handling mechanisms within the swinstall and swmodify utilities. When these commands execute, they fail to properly verify the integrity of file paths or validate user permissions before creating or overwriting system files. This allows a local attacker to craft specific input parameters or manipulate file system operations in such a way that the commands will create or modify files with root ownership and permissions. The vulnerability operates at the core of Unix-like privilege models where proper file system access controls should prevent unauthorized modifications to system-critical components.
The operational impact of this vulnerability extends far beyond simple local privilege escalation, as it provides attackers with a direct path to root access on affected hp-ux systems. Once an attacker successfully exploits this flaw, they can execute arbitrary code with the highest system privileges, potentially leading to complete system compromise. This vulnerability is particularly dangerous in enterprise environments where hp-ux systems often run critical infrastructure services and where local users might have legitimate access to system resources. The implications include unauthorized data access, system modification, backdoor installation, and potential lateral movement within networked environments where these systems reside.
The vulnerability aligns with CWE-276, which describes improper file permissions, and demonstrates characteristics consistent with privilege escalation vectors found in the MITRE ATT&CK framework under the privilege escalation technique category. Organizations running hp-ux systems should immediately implement mitigations including restricting access to the swinstall and swmodify commands, implementing proper file system permissions, and applying available security patches from hp-ux vendors. Additionally, system administrators should conduct thorough audits of file permissions and implement monitoring solutions to detect unauthorized file creation or modification operations that could indicate exploitation attempts. The remediation process requires careful consideration of system functionality since these commands are legitimate administrative tools, necessitating a balanced approach that maintains operational capability while eliminating the security risk.