CVE-2008-1684 in Solaris
Summary
by MITRE
inetd on Sun Solaris 10, when debug logging is enabled, allows local users to write to arbitrary files via a symlink attack on the /var/tmp/inetd.log temporary file.
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Analysis
by VulDB Data Team • 06/01/2025
The vulnerability identified as CVE-2008-1684 represents a significant security flaw in the inetd service implementation on Sun Solaris 10 systems. This issue specifically manifests when debug logging is enabled, creating a dangerous condition that allows local attackers to manipulate file permissions and execute unauthorized write operations. The vulnerability stems from improper handling of temporary files during the logging process, which creates a predictable path that can be exploited through symbolic link manipulation techniques.
The technical flaw occurs within the inetd daemon's debug logging mechanism where it creates a temporary file at /var/tmp/inetd.log without proper security checks. When debug logging is enabled, the service attempts to write log entries to this location, but fails to validate whether the target path is a legitimate file or a symbolic link. An attacker can create a symbolic link at the expected location that points to any other file on the system, allowing them to write arbitrary data to files they would normally not have permission to modify. This represents a classic race condition vulnerability where the timing of file creation and access can be manipulated by an attacker.
The operational impact of this vulnerability extends beyond simple privilege escalation as it can enable attackers to corrupt critical system files, modify configuration data, or even overwrite binaries with malicious content. The attack vector is particularly dangerous because it requires only local user access, making it difficult to detect and prevent through network-based security measures. Once exploited, the attacker can potentially gain persistent access to the system or cause service disruption by corrupting essential system files. The vulnerability affects systems where inetd is running with debug logging enabled, which is often the case in development or debugging environments where administrators may not be aware of the security implications.
Mitigation strategies for this vulnerability should focus on immediate system hardening measures including disabling debug logging for inetd when not actively troubleshooting, implementing proper file permissions for temporary directories, and monitoring for suspicious symbolic link creation patterns. System administrators should also consider implementing file integrity monitoring solutions that can detect unauthorized modifications to critical system files. According to CWE classification, this vulnerability maps to CWE-377: Insecure Temporary File, which is categorized under the broader weakness of insufficient logging and monitoring. From an ATT&CK framework perspective, this represents a privilege escalation technique that can be used to establish persistence and maintain access to compromised systems. The vulnerability highlights the importance of proper temporary file handling and the need for security awareness training for system administrators who may inadvertently enable dangerous configurations during system maintenance or debugging activities.