CVE-2003-0337 in lsadmin
Summary
by MITRE
The ckconfig command in lsadmin for Load Sharing Facility (LSF) 5.1 allows local users to execute arbitrary programs by modifying the LSF_ENVDIR environment variable to reference an alternate lsf.conf file, then modifying LSF_SERVERDIR to point to a malicious lim program, which lsadmin then executes.
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Analysis
by VulDB Data Team • 06/13/2018
The vulnerability described in CVE-2003-0337 represents a critical privilege escalation flaw within the Load Sharing Facility (LSF) 5.1 software ecosystem. This issue specifically targets the ckconfig command functionality within the lsadmin utility, which serves as a configuration management tool for the LSF environment. The vulnerability stems from inadequate input validation and improper privilege handling mechanisms that allow local users to manipulate the software execution flow through environment variable manipulation. The attack vector leverages the trust relationships within the LSF architecture, where the system expects certain configuration files to exist in predetermined locations while failing to validate the authenticity or integrity of these references.
The technical exploitation of this vulnerability occurs through a sophisticated chain of environment variable manipulation that bypasses normal security controls. Attackers can modify the LSF_ENVDIR environment variable to point to a maliciously crafted lsf.conf file that contains references to alternative system components. This manipulation allows the attacker to redirect the system's configuration loading process to include their own controlled configuration parameters. The subsequent modification of LSF_SERVERDIR to reference a malicious lim program creates a perfect storm where the lsadmin utility, operating with elevated privileges, executes the attacker-controlled program with root-level permissions. This constitutes a classic path traversal and privilege escalation attack pattern that violates the principle of least privilege and demonstrates poor input sanitization practices.
The operational impact of this vulnerability extends far beyond simple local privilege escalation, as it provides attackers with complete control over the LSF environment and potentially the underlying system. The lim program serves as a critical component in LSF's resource management and job scheduling functions, meaning that a compromised lim program can lead to unauthorized job submissions, resource manipulation, and complete system compromise. This vulnerability affects organizations running LSF 5.1 deployments where local users might have access to the system but should not possess administrative privileges. The implications are particularly severe in high-performance computing environments where LSF manages critical computational resources and job scheduling across multiple nodes, potentially allowing attackers to disrupt services, steal sensitive data, or establish persistent access points within the cluster infrastructure.
Mitigation strategies for this vulnerability must address both the immediate exploitation vectors and the underlying architectural weaknesses that enabled the attack. Organizations should implement strict environment variable validation and sanitization within the lsadmin utility, ensuring that all referenced configuration paths are properly validated against a whitelist of approved locations. The principle of least privilege should be enforced more rigorously, preventing local users from modifying critical environment variables that control system behavior. Additionally, implementing file integrity monitoring solutions can help detect unauthorized modifications to lsf.conf files and other critical system configuration components. This vulnerability aligns with CWE-78 and CWE-22 categories, representing a command injection vulnerability through path manipulation and a path traversal attack respectively. From an ATT&CK framework perspective, this maps to privilege escalation techniques using environment variable manipulation and persistence mechanisms through system configuration file modification, highlighting the need for comprehensive security controls that address both the immediate threat and broader system integrity concerns.