CVE-2000-0515 in HP-UX
Summary
by MITRE
The snmpd.conf configuration file for the SNMP daemon (snmpd) in HP-UX 11.0 is world writable, which allows local users to modify SNMP configuration or gain privileges.
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Analysis
by VulDB Data Team • 10/02/2024
The vulnerability described in CVE-2000-0515 represents a critical security flaw in the HP-UX 11.0 operating system's SNMP daemon implementation. This issue stems from improper file permissions that allow any local user to modify the snmpd.conf configuration file, which serves as the primary configuration interface for the Simple Network Management Protocol daemon. The snmpd service is responsible for managing network management information and handling SNMP requests, making it a prime target for privilege escalation attacks. When a configuration file becomes world writable, it creates an inherent security weakness that directly violates the principle of least privilege, as outlined in security best practices and commonly referenced in industry standards such as those published by NIST and ISO/IEC 27001.
The technical flaw manifests through the improper file permission settings on the snmpd.conf file, which should typically be restricted to root or specific administrative users only. In this case, the file's permissions allow all local users to read, write, and modify its contents, creating a path for malicious actors to alter SNMP daemon behavior. Attackers could exploit this by adding malicious configuration entries that redirect SNMP traps to unauthorized systems, modify community strings to gain access to network management information, or even inject commands that could lead to privilege escalation. The vulnerability operates at the file system level and demonstrates a fundamental failure in access control implementation, which aligns with CWE-732, which describes improper permission assignment for critical resources. This weakness enables unauthorized modification of system configuration parameters that control network monitoring and management functions.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with potential access to sensitive network management information and control over SNMP-based monitoring systems. Local users who can modify the snmpd.conf file can effectively compromise the entire SNMP infrastructure, potentially allowing them to gain unauthorized access to network device information, manipulate monitoring data, or even establish backdoors through carefully crafted SNMP configurations. The attack surface is particularly concerning because SNMP daemons often run with elevated privileges to perform network management functions, making any compromise of their configuration files potentially catastrophic for network security. This vulnerability directly maps to ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation' and represents a clear pathway for attackers to escalate their privileges within the system.
Mitigation strategies for this vulnerability should focus on immediate permission correction combined with ongoing monitoring and access control improvements. System administrators must immediately change the file permissions on snmpd.conf to restrict write access to root-only users, typically using chmod 600 or equivalent restrictions. Additionally, regular security audits should verify that no other critical configuration files maintain world-writable permissions, as this represents a broader class of vulnerabilities. The implementation of proper access control mechanisms and regular permission reviews aligns with security frameworks such as those recommended in NIST SP 800-53 and ISO 27001 controls. Organizations should also consider implementing file integrity monitoring solutions to detect unauthorized changes to critical system files, which would provide additional defense-in-depth against similar vulnerabilities. The remediation process should include comprehensive system hardening procedures and regular security training for system administrators to prevent recurrence of such permission-related security issues.