CVE-2000-0224 in UnixWare
Summary
by MITRE
ARCserve agent in SCO UnixWare 7.x allows local attackers to gain root privileges via a symlink attack.
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability described in CVE-2000-0224 represents a critical privilege escalation flaw within the ARCserve agent implementation on SCO UnixWare 7.x operating systems. This issue stems from improper handling of symbolic links during file operations, creating a path traversal condition that local attackers can exploit to elevate their privileges from standard user level to root access. The ARCserve agent, which is a backup and recovery solution, runs with elevated privileges to perform system-level operations, making it a prime target for attackers seeking administrative control over the system.
The technical exploitation mechanism involves a symlink attack where an attacker creates malicious symbolic links in strategic locations that the ARCserve agent processes without proper validation. When the agent encounters these symbolic links during its normal operation, it follows them to their targets, potentially allowing the attacker to manipulate files or directories that should remain protected. This type of vulnerability falls under the category of insecure temporary file handling and improper privilege management, commonly associated with CWE-377 and CWE-276. The flaw demonstrates a classic race condition scenario where the agent's operations create windows of opportunity for attackers to substitute legitimate files with malicious counterparts through symbolic link manipulation.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete administrative control over the affected SCO UnixWare 7.x systems. Once root access is obtained, attackers can modify system files, install backdoors, steal sensitive data, or establish persistent access to the compromised environment. The local nature of the attack means that an attacker must already have user-level access to the system, but the privilege escalation capability makes this initial foothold extremely valuable for further exploitation. This vulnerability is particularly concerning in enterprise environments where backup agents often run with elevated privileges and may have access to sensitive system resources.
Security professionals should implement immediate mitigations including updating to patched versions of the ARCserve agent, implementing proper file permission controls, and monitoring for suspicious symlink creation patterns. The vulnerability also highlights the importance of following the principle of least privilege, ensuring that backup agents and similar system tools operate with minimal necessary permissions. Organizations should consider implementing file integrity monitoring solutions to detect unauthorized symbolic link modifications and establish robust access control policies. This case exemplifies the ATT&CK technique T1068, which involves exploiting local privilege escalation vulnerabilities, and underscores the necessity of proper input validation and privilege separation in system design to prevent such attacks from succeeding.