CVE-2000-0798 in IRIX
Summary
by MITRE
The truncate function in IRIX 6.x does not properly check for privileges when the file is in the xfs file system, which allows local users to delete the contents of arbitrary files.
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Analysis
by VulDB Data Team • 10/10/2024
The vulnerability described in CVE-2000-0798 represents a critical privilege escalation flaw within the IRIX operating system version 6.x, specifically affecting the truncate function implementation in the xfs file system. This weakness stems from inadequate privilege validation mechanisms that fail to properly verify user permissions before executing file truncation operations. The issue manifests when local users attempt to truncate files within the xfs file system without proper authorization, creating a scenario where unauthorized modifications can occur.
The technical flaw lies in the improper implementation of access control checks within the kernel-level truncate system call. When a user invokes the truncate function on a file located in the xfs file system, the system fails to validate whether the requesting user possesses sufficient privileges to perform this operation. This vulnerability operates at the kernel level and directly impacts the file system's integrity by allowing unauthorized users to manipulate file contents through truncation operations. The flaw essentially bypasses the normal permission checking procedures that should prevent users from modifying files they do not own or lack write permissions for.
From an operational perspective, this vulnerability presents significant security implications for systems running IRIX 6.x with xfs file systems. Local users who can execute the truncate function can effectively delete or overwrite the contents of any file on the system, regardless of ownership or permission settings. This capability allows attackers to corrupt critical system files, erase important data, or potentially create backdoors by truncating system logs or configuration files. The impact extends beyond simple data loss as it enables attackers to compromise system integrity and potentially escalate privileges further through file manipulation attacks.
The vulnerability aligns with CWE-284 Access Control Issues, specifically addressing inadequate access control mechanisms within the file system layer. It also maps to ATT&CK technique T1059 Command and Scripting Interpreter, as local users could leverage this vulnerability to execute malicious code through file manipulation. Additionally, this weakness demonstrates characteristics of T1490 Inhibit System Recovery, as truncating system files can render systems unstable or unusable. The vulnerability's exploitation requires local system access but provides broad impact potential, making it a significant concern for system administrators managing IRIX environments.
Mitigation strategies for CVE-2000-0798 should focus on immediate system updates and patches provided by Silicon Graphics International to address the privilege checking implementation. System administrators should implement strict access controls and monitor file system operations for suspicious truncation activities. The xfs file system should be evaluated for unnecessary local user access, and privilege separation mechanisms should be strengthened. Regular security audits of file system permissions and kernel-level operations should be conducted to identify similar access control weaknesses. Organizations should also consider implementing intrusion detection systems to monitor for unauthorized truncation activities and establish proper logging procedures for file system modifications to detect potential exploitation attempts.