CVE-1999-1218 in Amiga Unix
Summary
by MITRE
vulnerability in finger in commodore amiga unix 2.1p2a and earlier allows local users to read arbitrary files.
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Analysis
by VulDB Data Team • 04/03/2025
The vulnerability identified as CVE-1999-1218 represents a critical access control flaw within the finger service implementation of Commodore Amiga UNIX 2.1p2a and earlier versions. This issue stems from improper authorization mechanisms within the finger daemon that fails to properly validate file access requests, allowing local users to bypass normal file system permissions and read arbitrary files on the system. The finger service, traditionally used to retrieve user information from remote systems, was implemented in this Amiga UNIX variant with insufficient security controls that permit local privilege escalation through unauthorized file access.
The technical exploitation of this vulnerability occurs through the finger service's handling of file path parameters, where input validation is either absent or inadequate. When local users interact with the finger daemon, they can manipulate the service to traverse file system paths and access files that should normally be restricted to authorized users or system processes. This flaw aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability specifically manifests when the finger service processes user requests without implementing proper path sanitization or access control checks.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables local users to potentially access sensitive system files, configuration data, and user credentials that could facilitate further compromise of the system. Attackers could exploit this weakness to gather intelligence about system configuration, discover user accounts, access password files, or retrieve other confidential information that would normally be protected by standard file system permissions. This represents a significant escalation from a local privilege escalation perspective, as it allows users to access system resources they should not normally be able to reach, potentially leading to complete system compromise. The vulnerability affects the fundamental security model of the operating system by undermining the file system access control mechanisms that are essential for maintaining system integrity.
Mitigation strategies for this vulnerability require immediate implementation of system updates and patches provided by Commodore or third-party security vendors. System administrators should disable the finger service entirely if it is not required for operational purposes, as this eliminates the attack surface entirely. Additionally, implementing proper input validation and access control measures within the finger daemon would prevent path traversal attempts. The remediation approach should follow ATT&CK framework tactic TA0006 (Credential Access) and technique T1078 (Valid Accounts) to ensure comprehensive protection against unauthorized access attempts. Organizations should also implement monitoring for unusual finger service activity and establish proper file system permissions to minimize the impact of any potential exploitation attempts. Regular security audits of system services and daemon implementations should be conducted to identify similar vulnerabilities in other network services that may be subject to similar access control flaws.