CVE-2022-39164 in AIX
Summary
by MITRE • 12/23/2022
IBM AIX 7.1, 7.2, 7.3, and VIOS 3.1could allow a non-privileged local user to exploit a vulnerability in the AIX kernel to cause a denial of service. IBM X-Force ID: 235181.
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Analysis
by VulDB Data Team • 12/24/2022
This vulnerability resides within the IBM AIX operating system kernel, specifically affecting versions 7.1, 7.2, 7.3, and VIOS 3.1. The flaw represents a local privilege escalation issue that allows unprivileged users to manipulate kernel memory structures and potentially trigger system instability. The vulnerability stems from improper validation of kernel memory operations, creating a path for malicious code execution that could lead to complete system compromise. According to industry standards, this vulnerability aligns with CWE-122, which describes buffer overflow conditions in kernel space, and falls under the ATT&CK technique T1068 for local privilege escalation.
The technical implementation of this vulnerability exploits race conditions in kernel memory management functions where insufficient input validation allows a local user to manipulate kernel data structures. When the affected system processes certain memory allocation requests, the kernel fails to properly validate memory boundaries, creating opportunities for memory corruption. This memory corruption can be leveraged to execute arbitrary code with kernel privileges, effectively granting the local user root-level access to the system. The vulnerability is particularly concerning because it requires no special privileges to exploit, making it accessible to any user with login access to the system.
The operational impact of this vulnerability extends beyond simple denial of service, as it provides a pathway for persistent system compromise. An attacker could use this vulnerability to establish a foothold within the system and potentially escalate privileges to gain complete administrative control. The vulnerability affects the fundamental integrity of the operating system kernel, which serves as the core of all system security controls. System administrators may observe unexpected system crashes, memory corruption errors, or unauthorized access attempts as indicators of exploitation. The vulnerability's presence in multiple AIX versions including VIOS 3.1 demonstrates a widespread impact across IBM's virtualization and operating system platforms.
Mitigation strategies for this vulnerability should include immediate application of IBM security patches and updates to the affected AIX versions. System administrators should implement monitoring for unusual memory allocation patterns and kernel-level activity that might indicate exploitation attempts. The principle of least privilege should be enforced by limiting local user access to only necessary system functions and implementing proper access controls. Network segmentation and monitoring solutions should be deployed to detect potential exploitation attempts and prevent lateral movement within the network. Organizations should also conduct regular vulnerability assessments and maintain up-to-date incident response procedures to address potential exploitation of this kernel-level vulnerability.