Source: cve@mitre.org
Vulnerability in Monitor utility (SYS$SHARE:SPISHR.EXE) in VMS 5.0 through 5.4-2 allows local users to gain privileges.
VMS systems running versions 5.0 through 5.4-2 are vulnerable to a local privilege escalation via the Monitor utility (SYS$SHARE:SPISHR.EXE). This vulnerability allows attackers to gain unauthorized access and control of the system, potentially leading to data breaches, system compromise, and denial of service. Successful exploitation grants attackers elevated privileges, enabling them to execute arbitrary commands and modify system configurations.
Step 1: Local Access: The attacker must have local access to the VMS system, either through a compromised account or physical access. Step 2: Identify the Vulnerable Utility: The attacker identifies the Monitor utility (SYS$SHARE:SPISHR.EXE) as a potential target. Step 3: Exploit Execution: The attacker crafts a malicious input or sequence of commands designed to trigger the vulnerability within the Monitor utility. This could involve sending a specially crafted input string, exploiting a race condition, or overflowing a buffer. Step 4: Code Execution: The crafted input causes the Monitor utility to execute arbitrary code controlled by the attacker. Step 5: Privilege Escalation: The attacker's code executes with the elevated privileges of the Monitor utility, granting the attacker unauthorized access and control of the system.
The vulnerability lies within the Monitor utility (SYS$SHARE:SPISHR.EXE) in VMS versions 5.0 through 5.4-2. The exact root cause is likely a privilege escalation flaw. The Monitor utility, when executed, likely has elevated privileges. The vulnerability allows a local user to exploit a flaw in how the utility handles input or processes requests, leading to the execution of arbitrary code with the elevated privileges of the Monitor utility. This could be due to a buffer overflow, improper input validation, or a race condition in how the utility handles user-supplied data or system calls. The lack of proper access controls or insufficient security checks within the utility's code allows a local user to manipulate the program's behavior and gain unauthorized access.
Due to the age and specific nature of the vulnerability, it is unlikely to be directly targeted by modern APT groups. However, any threat actor with access to a VMS system could potentially exploit this vulnerability. There is no indication of this vulnerability being present on the CISA KEV list.
Monitor system logs for unusual activity related to the Monitor utility (SYS$SHARE:SPISHR.EXE).
Monitor for unexpected changes in user privileges or access rights.
Analyze process execution logs for suspicious commands or processes launched by the Monitor utility.
Review system audit logs for unauthorized access attempts or privilege escalation events.
Network traffic analysis may not be directly applicable, as this is a local privilege escalation.
Upgrade to a patched version of VMS (if available).
Implement strict access controls to limit user access to the system and the Monitor utility.
Regularly audit user accounts and privileges.
Monitor system logs for suspicious activity and security events.
Consider using a host-based intrusion detection system (HIDS) to monitor for malicious activity.
Implement the principle of least privilege, granting users only the necessary permissions.
Review and harden the system configuration to minimize attack surface.