CVE-2001-0809 in HP-UX
Summary
by MITRE
Vulnerability in CIFS/9000 Server (SAMBA) A.01.06 and earlier in HP-UX 11.0 and 11.11, when configured as a print server, allows local users to overwrite arbitrary files by modifying certain resources.
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Analysis
by VulDB Data Team • 04/30/2019
The vulnerability identified as CVE-2001-0809 represents a critical file system access control flaw within the CIFS/9000 Server implementation on HP-UX operating systems. This vulnerability specifically affects SAMBA versions through A.01.06 and impacts HP-UX 11.0 and 11.11 systems when configured as print servers. The flaw stems from inadequate validation of file access operations within the CIFS protocol implementation, creating a path for local privilege escalation through malicious file modification attempts.
The technical root cause of this vulnerability lies in the improper handling of file resource management during print job processing within the CIFS server component. When the system operates as a print server, certain temporary or configuration files are created with predictable naming conventions or insufficient access controls. Local users can exploit this by crafting specific print jobs or resource modifications that cause the system to overwrite files in arbitrary locations with malicious content. This represents a classic case of insufficient input validation and inadequate privilege separation, where the print server process operates with elevated permissions but fails to properly validate file access requests.
The operational impact of this vulnerability extends beyond simple file overwrites as it provides a pathway for local users to potentially compromise system integrity and availability. Attackers can leverage this flaw to overwrite critical system files, configuration data, or even executables that could lead to privilege escalation or denial of service conditions. The vulnerability is particularly concerning in print server environments where multiple users may have local access to the system, as it transforms ordinary local user access into a potential vector for system-wide compromise. This aligns with CWE-22 which addresses improper limitation of a pathname to a restricted directory, and represents a privilege escalation vector through file system manipulation.
Mitigation strategies for this vulnerability require immediate system updates to patched SAMBA versions and HP-UX releases that address the file access control issues. System administrators should implement strict access controls and monitoring of print server operations to detect anomalous file modification patterns. The recommended approach includes applying the latest security patches from HP and SAMBA project maintainers, implementing proper file system permissions for print-related directories, and conducting regular security audits of print server configurations. Additionally, network segmentation and privilege separation measures should be enforced to limit local user access to critical system resources. Organizations should also consider implementing intrusion detection systems to monitor for suspicious file access patterns and maintain comprehensive system logging for forensic analysis.
This vulnerability demonstrates the importance of proper resource management in network services and highlights the risks associated with insufficient input validation in server applications. The attack vector is particularly relevant in enterprise environments where print servers are commonly deployed and where local user access is prevalent. The remediation process should include not only patching the specific vulnerability but also reviewing and strengthening overall system security posture, particularly regarding file system access controls and privilege management. Security monitoring should be enhanced to detect potential exploitation attempts through file system manipulation patterns that align with the attack methodology described in the vulnerability.