CVE-2002-0887 in OpenServer
Summary
by MITRE
scoadmin for Caldera/SCO OpenServer 5.0.5 and 5.0.6 allows local users to overwrite arbitrary files via a symlink attack on temporary files, as demonstrated using log files.
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Analysis
by VulDB Data Team • 02/09/2025
The vulnerability identified as CVE-2002-0887 represents a critical file system security flaw affecting scoadmin utility within Caldera and SCO OpenServer operating systems versions 5.0.5 and 5.0.6. This issue stems from improper handling of temporary files during the administrative processes, creating a window of opportunity for local attackers to manipulate system files through symbolic link attacks. The vulnerability specifically manifests when the scoadmin utility creates temporary files that are subsequently used for logging purposes, establishing a predictable file creation pattern that can be exploited by malicious users with local access privileges.
The technical implementation of this vulnerability follows a classic symlink attack pattern where an attacker creates a symbolic link with a predetermined name that matches the temporary file expected by the scoadmin utility. When the utility executes and attempts to create or write to the temporary file, it inadvertently follows the symbolic link and writes data to a target file of the attacker's choosing rather than the intended temporary location. This type of vulnerability is classified under CWE-59 as Improper Link Resolution, which specifically addresses issues where software follows symbolic links without proper validation of the target file system objects. The attack vector requires local system access and leverages the principle of least privilege by exploiting the assumption that temporary file creation operations are safe and isolated from user interference.
The operational impact of CVE-2002-0887 extends beyond simple file overwriting capabilities, as it provides attackers with the means to modify critical system files including log files that may contain sensitive information or be used by other system components. This vulnerability can be exploited to escalate privileges, modify system configurations, or create backdoors within the operating system environment. The attack demonstrates how seemingly benign administrative utilities can become security risks when they fail to properly validate temporary file operations, potentially compromising the integrity of the entire system. The vulnerability operates within the context of the Linux and Unix-like systems where the administrative tool is designed to manage system configuration and logging functions, making it a particularly dangerous flaw for system administrators who rely on these utilities for routine maintenance operations.
Mitigation strategies for CVE-2002-0887 should focus on addressing the root cause through proper temporary file handling mechanisms that prevent symbolic link attacks. The recommended approach involves implementing secure temporary file creation techniques such as using secure.mkstemp() functions or ensuring that temporary files are created with appropriate permissions and atomic operations that prevent symlink manipulation. System administrators should also consider implementing proper file system permissions and access controls to limit the ability of local users to create symbolic links in directories where administrative utilities operate. This vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: PowerShell and similar techniques that exploit system utilities for privilege escalation. Organizations should also consider implementing monitoring and logging of temporary file creation operations to detect potential exploitation attempts. The remediation process requires careful evaluation of all administrative utilities that create temporary files and implementation of secure coding practices that validate file system objects before operations are performed, effectively addressing the underlying CWE-59 classification through proper input validation and secure file handling protocols.