CVE-2000-0249 in AIX
Summary
by MITRE
The AIX Fast Response Cache Accelerator (FRCA) allows local users to modify arbitrary files via the configuration capability in the frcactrl program.
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Analysis
by VulDB Data Team • 04/21/2026
The AIX Fast Response Cache Accelerator FRCA represents a critical security vulnerability within IBM AIX operating systems that enables local privilege escalation through improper access controls in the frcactrl configuration utility. This vulnerability exists in the fundamental design of how the FRCA component manages file permissions and configuration modifications, creating an exploitable path for malicious users to gain unauthorized access to system resources. The flaw specifically targets the frcactrl program which serves as the primary interface for managing FRCA cache configurations, allowing attackers to manipulate system files through legitimate administrative functions. The vulnerability stems from insufficient input validation and privilege checking mechanisms that fail to properly verify user permissions before executing file modification operations.
The technical exploitation of CVE-2000-0249 occurs when a local user leverages the configuration capabilities of the frcactrl program to modify files that should normally be restricted to privileged system processes. This represents a classic case of insufficient privilege separation where the program fails to enforce proper access controls between different user contexts. The vulnerability manifests when the frcactrl utility processes configuration parameters without adequately validating the originating user's privileges or the target file's security attributes. This flaw aligns with CWE-276, which addresses improper privilege management in software applications, and demonstrates how inadequate access control implementation can create persistent security weaknesses in system components. The attack vector specifically exploits the lack of proper file permission validation within the FRCA subsystem, allowing any local user to manipulate critical system files through what should be restricted administrative functions.
The operational impact of this vulnerability extends beyond simple file modification capabilities to encompass potential system compromise and data integrity violations. Local users who exploit this vulnerability can modify critical system files including configuration databases, cache management structures, or even core system binaries, potentially leading to complete system compromise. The implications are particularly severe in enterprise environments where AIX systems serve as critical infrastructure components, as this vulnerability could enable attackers to establish persistent backdoors or disable security mechanisms. The vulnerability's local nature means it requires no network access or external exploitation, making it particularly dangerous in environments where local user access is not properly restricted. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be leveraged to achieve persistence and lateral movement within affected systems.
Mitigation strategies for CVE-2000-0249 require immediate implementation of access control hardening measures and system configuration reviews to prevent unauthorized modifications to critical cache configuration files. Organizations should implement proper file permission controls and privilege separation mechanisms to ensure that only authorized system administrators can execute the frcactrl program with elevated privileges. The recommended approach includes applying the relevant IBM AIX security patches and updates that address the specific privilege escalation flaw in the FRCA component. System administrators should also conduct comprehensive audits of file permissions and access controls within the FRCA subsystem to identify and remediate any additional security weaknesses. Additionally, monitoring and logging mechanisms should be enhanced to detect unauthorized modifications to cache configuration files, providing visibility into potential exploitation attempts. The vulnerability highlights the importance of proper privilege management and access control implementation in system security architecture, emphasizing that even legitimate administrative tools require robust security controls to prevent unauthorized access and modification of critical system resources.