CVE-2005-3268 in yiff server
Summary
by MITRE
yiff server (yiff-server) 2.14.2 on debian gnu/linux runs as root and does not properly verify ownership of files that it opens which allows local users to read arbitrary files.
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Analysis
by VulDB Data Team • 07/27/2017
The yiff server vulnerability identified as CVE-2005-3268 represents a critical privilege escalation and information disclosure flaw in the yiff-server software version 2.14.2 running on Debian GNU/Linux systems. This vulnerability stems from the server's improper file ownership verification mechanisms, creating a dangerous condition where local users can exploit the system's trust model to access files they should not normally be able to read. The core issue manifests when the server operates with root privileges, which is a common but risky practice for network services requiring low-level system access. When the yiff server opens files, it fails to validate whether the requesting user has proper authorization to access the target file, essentially bypassing the standard file permission checks that Unix-like systems rely upon for security isolation.
The technical flaw in this vulnerability aligns with CWE-276, which describes improper file permissions and inadequate access control mechanisms. The vulnerability operates through a classic path traversal and privilege escalation attack vector where local users can manipulate file access patterns to read files that would normally be restricted to root or specific user groups. This occurs because the server's file handling logic does not perform proper access validation before opening files, allowing attackers to exploit the server's elevated privileges to read arbitrary files on the system. The flaw is particularly dangerous because it leverages the server's root execution context to bypass normal file system security controls, effectively creating a backdoor for information disclosure that can expose sensitive system files, configuration data, and potentially user credentials or private keys.
The operational impact of CVE-2005-3268 extends far beyond simple information disclosure, as it provides attackers with the ability to access critical system resources that could lead to further compromise of the affected system. Local users who exploit this vulnerability can potentially read system configuration files, password hashes, SSH keys, and other sensitive data that could facilitate additional attacks including privilege escalation, lateral movement, or complete system compromise. The vulnerability's exploitation is relatively straightforward, requiring only local access to the system and knowledge of the server's operation, making it particularly concerning for environments where local user access is not strictly controlled. This type of vulnerability falls under the ATT&CK technique T1005, which covers data from local system, and T1068, which involves local privilege escalation, demonstrating the multi-faceted nature of the threat.
Mitigation strategies for this vulnerability should focus on immediate remediation through patching the yiff-server software to version 2.14.3 or later, which contains the necessary file ownership verification fixes. System administrators should also implement proper privilege separation by running the yiff server with non-root accounts whenever possible, reducing the attack surface and limiting the potential impact of such vulnerabilities. Additionally, implementing mandatory access controls through SELinux or AppArmor profiles can provide an additional layer of protection by restricting the server's file access capabilities even if the vulnerability is exploited. Network segmentation and monitoring solutions should be deployed to detect anomalous file access patterns that might indicate exploitation attempts, while regular security audits should verify that no other services on the system share similar privilege escalation vulnerabilities. The vulnerability serves as a reminder of the critical importance of proper privilege management and access control validation in server applications, particularly those that operate with elevated system privileges.