CVE-2000-0015 in CascadeView
Summary
by MITRE
CascadeView TFTP server allows local users to gain privileges via a symlink attack.
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Analysis
by VulDB Data Team • 01/20/2025
The vulnerability identified as CVE-2000-0015 affects the CascadeView TFTP server implementation, presenting a significant privilege escalation risk through symbolic link manipulation. This flaw resides in the server's handling of file operations during TFTP transfers, specifically when processing files that may be subject to symlink attacks. The vulnerability enables local users to exploit the server's file handling mechanisms to gain elevated privileges, potentially compromising the entire system.
The technical root cause of this vulnerability stems from inadequate input validation and improper file access controls within the CascadeView TFTP server. When the server processes TFTP operations, it fails to properly verify the authenticity of file paths, particularly when symbolic links are involved in the file transfer process. This allows malicious local users to create symbolic links that point to sensitive system files or directories, which the TFTP server then accesses with elevated privileges. The flaw manifests when the server follows symlinks without proper validation, effectively bypassing normal access controls and privilege boundaries. This type of vulnerability is classified under CWE-59, which deals with improper handling of symbolic links, and represents a classic example of a privilege escalation attack vector.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it provides attackers with the ability to manipulate system resources and potentially gain unauthorized access to sensitive data. Local users who exploit this vulnerability can elevate their privileges to the level of the TFTP server process, which typically runs with elevated permissions to handle network file transfers. This creates a persistent threat vector that can be leveraged to modify system files, install malicious software, or establish backdoors within the network infrastructure. The attack requires local system access but can result in complete system compromise, making it particularly dangerous in environments where multiple users have access to the affected system.
Mitigation strategies for CVE-2000-0015 should focus on both immediate patching and architectural improvements to prevent similar vulnerabilities. Organizations should immediately apply vendor patches or upgrade to versions of CascadeView TFTP server that properly handle symbolic links and validate file paths during TFTP operations. System administrators should implement strict file access controls and ensure that TFTP server processes run with minimal required privileges. The implementation of proper symlink handling mechanisms, including checking for and rejecting symbolic links during file operations, should be enforced. Additionally, monitoring and logging of TFTP server activities can help detect potential exploitation attempts. This vulnerability aligns with ATT&CK technique T1068, which covers privilege escalation through local exploits, and demonstrates the importance of proper input validation in network service implementations. The recommended approach includes conducting thorough security assessments of all network services and implementing defense-in-depth strategies to prevent similar attacks across the entire infrastructure.