CVE-2009-0370 in AIX
Summary
by MITRE
Multiple unspecified vulnerabilities in IBM AIX 5.2.0 through 6.1.2 allow local users to append data to arbitrary files, related to (1) rmsock and (2) rmsock64 not creating "secure log files."
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Analysis
by VulDB Data Team • 05/15/2025
The vulnerability identified as CVE-2009-0370 affects IBM AIX operating systems across versions 5.2.0 through 6.1.2 and represents a significant security flaw related to file handling operations within the system's socket management utilities. This issue manifests through two specific components: rmsock and rmsock64 which are responsible for removing socket files during system operations. The core problem lies in how these utilities handle log file creation processes, creating opportunities for local attackers to manipulate file contents through malicious append operations. The vulnerability stems from improper secure file creation practices that allow adversaries to inject data into arbitrary files on the system, potentially compromising system integrity and confidentiality.
From a technical perspective, the flaw operates through insecure temporary file creation mechanisms where rmsock and rmsock64 do not properly implement secure file handling protocols when generating log files. This insecure practice creates a race condition scenario where local users can exploit the timing window between file creation and access to append data to target files. The vulnerability aligns with CWE-362, which addresses race conditions in file operations, and specifically relates to improper file permissions and insecure temporary file creation patterns. Attackers can leverage this weakness to append malicious data to files that should remain protected, potentially leading to privilege escalation or data corruption scenarios.
The operational impact of this vulnerability extends beyond simple data manipulation as it creates persistent security risks within IBM AIX environments. Local users who can execute these utilities gain the ability to modify files that may contain sensitive system information, configuration data, or application logs. This capability can be exploited to hide malicious activities, corrupt system data, or manipulate audit trails, making detection and forensic analysis more challenging. The vulnerability particularly affects systems where these utilities are executed with elevated privileges, potentially allowing attackers to escalate their access level and compromise broader system security. According to ATT&CK framework, this vulnerability maps to T1059.007 for command and scripting interpreter and T1070.004 for indicator removal, as attackers can modify system logs to avoid detection.
Mitigation strategies for CVE-2009-0370 require immediate system updates and implementation of secure file handling practices. Organizations should prioritize applying the relevant IBM AIX security patches that address the insecure file creation logic in rmsock and rmsock64 utilities. System administrators should also implement proper file permission controls and audit file access patterns to detect unauthorized modifications. The remediation process involves verifying that log file creation follows secure practices including proper file ownership, restricted permissions, and atomic file creation operations. Additionally, implementing monitoring solutions that track access to socket-related utilities and log file modifications can help detect exploitation attempts. Security teams should also conduct comprehensive system audits to identify any potential compromise through this vulnerability, particularly focusing on log files and system configuration data that could have been manipulated by attackers.