CVE-2023-45169 in AIX
Summary
by MITRE • 01/11/2024
IBM AIX 7.2, 7.3, and VIOS 3.1 could allow a non-privileged local user to exploit a vulnerability in the pmsvcs kernel extension to cause a denial of service. IBM X-Force ID: 267967.
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Analysis
by VulDB Data Team • 01/25/2024
The vulnerability identified as CVE-2023-45169 affects IBM AIX operating system versions 7.2 and 7.3, as well as IBM VIOS version 3.1, representing a significant security concern for systems running these platforms. This issue specifically targets the pmsvcs kernel extension, which is responsible for power management services within the operating system. The vulnerability manifests as a local denial of service condition that can be exploited by unprivileged users, making it particularly concerning given the broad attack surface it presents. The pmsvcs extension serves as a critical component in managing system power states and hardware resources, which directly impacts the overall stability and operational integrity of affected systems.
The technical flaw resides within the kernel extension's handling of certain input parameters or system calls that are processed during power management operations. This type of vulnerability typically involves improper validation of user-supplied data or inadequate bounds checking within kernel space code. When a local user crafts specific inputs or triggers particular sequences of operations through the pmsvcs interface, the kernel extension fails to properly handle these conditions, leading to system instability. The vulnerability can be characterized as a kernel-level memory corruption issue or resource exhaustion condition that results in the system becoming unresponsive or requiring manual restart to recover. According to the CWE classification system, this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, or potentially CWE-125, which addresses out-of-bounds read conditions in kernel space. The nature of the flaw suggests that it operates at the kernel level where privilege escalation or system compromise could potentially occur, though the current description indicates local exploitation only.
The operational impact of this vulnerability extends beyond simple service disruption, as it can compromise the reliability and availability of critical enterprise systems. Organizations running IBM AIX or VIOS environments may experience unexpected system downtime, particularly in environments where power management features are actively utilized. The denial of service condition can occur without requiring elevated privileges, meaning that any local user with basic system access can potentially trigger the vulnerability. This characteristic significantly increases the attack surface and makes the vulnerability particularly dangerous in multi-user environments. The impact is further compounded by the fact that power management services are often integral to system performance optimization, making the disruption of these services potentially catastrophic in mission-critical applications. From an attack perspective, this vulnerability could be leveraged as part of a broader exploitation campaign or could serve as a stepping stone for more advanced attacks, particularly when combined with other system weaknesses. The ATT&CK framework would classify this as a privilege escalation or denial of service technique, potentially falling under the T1499 category for network denial of service or T1068 for local privilege escalation.
Mitigation strategies for CVE-2023-45169 should prioritize immediate implementation of vendor-provided patches and updates as soon as they become available. Organizations should conduct thorough risk assessments to determine which systems are most vulnerable and prioritize patching accordingly, particularly focusing on systems where power management services are actively utilized. System administrators should monitor for any unusual system behavior or performance degradation that could indicate exploitation attempts. Network segmentation and access controls should be reviewed to limit local user access where possible, though this approach is less effective given that the vulnerability requires no elevated privileges to exploit. Monitoring logs for unusual activity related to power management services and kernel extensions can provide early detection capabilities. Additionally, organizations should consider implementing intrusion detection systems that can identify potential exploitation attempts targeting kernel-level services. The patching process should include comprehensive testing in non-production environments before deployment to ensure that the updates do not introduce compatibility issues or regressions. System administrators should also review and validate existing security configurations to ensure that unnecessary power management services are disabled where possible, reducing the overall attack surface. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within the broader system landscape, as kernel-level vulnerabilities often indicate potential for related issues within the same codebase.