CVE-2000-0317 in Solaris
Summary
by MITRE
Buffer overflow in Solaris 7 lpset allows local users to gain root privileges via a long -r option.
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Analysis
by VulDB Data Team • 01/14/2025
The vulnerability identified as CVE-2000-0317 represents a critical buffer overflow flaw within the Solaris 7 lpset utility, which is part of the Line Printer daemon functionality. This issue specifically affects the handling of the -r command-line option, where the application fails to properly validate input length before copying data into a fixed-size buffer. The lpset utility, designed for configuring printer queues and printer-related settings, operates with elevated privileges as it manages system-level printing services. When a local user provides an excessively long argument to the -r option, the program's insufficient bounds checking allows memory corruption to occur beyond the allocated buffer boundaries, creating a condition where arbitrary code execution becomes possible. This vulnerability directly violates the principle of input validation and demonstrates a classic buffer overflow pattern that has been extensively documented in the CWE database under category 121, which encompasses heap-based buffer overflows and related memory corruption issues.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with a direct path to system compromise through local access. Since the lpset utility typically runs with root privileges or equivalent system permissions, successful exploitation enables an attacker to execute code with the highest level of system access. This creates a significant risk for environments where local user accounts exist, particularly in multi-user systems where unauthorized users might attempt to leverage this flaw. The vulnerability is particularly dangerous because it requires minimal privileges to exploit - only local access is needed, making it an attractive target for both casual attackers and more sophisticated threat actors. The attack vector is straightforward: an attacker simply needs to execute the lpset command with a maliciously crafted -r argument that exceeds the buffer size, triggering the overflow condition that can then be leveraged to overwrite critical memory locations including return addresses or function pointers.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The primary solution involves applying the official patch provided by Sun Microsystems, which corrects the buffer overflow by implementing proper input validation and bounds checking for the -r option parameter. Additionally, system administrators should implement privilege separation techniques and ensure that the lpset utility operates with the minimum necessary privileges through proper access controls and file permissions. Security hardening measures include disabling unnecessary printer queue configurations, implementing proper input sanitization at all application interfaces, and establishing monitoring for suspicious lpset usage patterns. From an operational security standpoint, this vulnerability aligns with ATT&CK technique T1068, which describes "Exploitation for Privilege Escalation," and demonstrates the importance of maintaining up-to-date system patches as outlined in the NIST Cybersecurity Framework. Organizations should also consider implementing application whitelisting policies to restrict execution of potentially vulnerable utilities and deploy intrusion detection systems that can monitor for anomalous command execution patterns involving the lpset utility. The vulnerability underscores the critical need for secure coding practices and input validation, particularly in system utilities that operate with elevated privileges, as emphasized in the OWASP Top Ten security risks and various industry security standards including ISO 27001 and CIS Controls.