CVE-2006-0666 in AIX
Summary
by MITRE
Unspecified vulnerability in the (1) unix_mp and (2) unix_64 kernels in IBM AIX 5.3 VRMF 5.3.0.30 through 5.3.0.33 allows local users to cause a denial of service (system crash) via unknown vectors related to EMULATE_VMX.
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Analysis
by VulDB Data Team • 06/22/2025
This vulnerability exists within the IBM AIX 5.3 operating system kernel implementations, specifically affecting both the unix_mp and unix_64 kernel variants. The issue manifests as an unspecified flaw in the EMULATE_VMX functionality which is responsible for virtual machine emulation capabilities within the AIX environment. The vulnerability is particularly concerning as it affects a critical system component that handles virtualization operations, with affected versions ranging from VRMF 5.3.0.30 through 5.3.0.33. The unspecified nature of the vulnerability vectors suggests that the exact attack mechanisms remain partially undisclosed, which is common with certain types of kernel-level flaws that may involve memory corruption or improper handling of virtualization states.
The technical exploitation of this vulnerability results in a local denial of service condition that can cause complete system crashes. This type of vulnerability falls under the category of kernel-level exploits that can be leveraged by locally authenticated users to compromise system stability and availability. The EMULATE_VMX functionality typically handles virtual machine operations and hardware virtualization features, making this vulnerability particularly dangerous in environments where virtualization is actively used. The vulnerability likely involves improper handling of virtual machine execution states or memory management within the kernel's virtualization subsystem, potentially leading to memory corruption or invalid memory access patterns that cause the kernel to panic and crash.
From an operational perspective, this vulnerability represents a significant risk to enterprise systems running IBM AIX 5.3, particularly in environments where virtualization is utilized for resource optimization and system consolidation. The local nature of the attack means that an authenticated user with access to the system can potentially cause system-wide outages, which could result in substantial business disruption and data loss. Organizations using these affected versions may experience unexpected system downtime, especially in mission-critical applications where system availability is paramount. The vulnerability's impact extends beyond simple service interruption as it can affect the entire system stability and may require complete system restarts to recover from the crash conditions.
The vulnerability aligns with CWE-119 which addresses "Improper Access to Memory" and represents a classic example of memory safety issues in kernel code. From an ATT&CK framework perspective, this vulnerability maps to T1499.004 which covers "Endpoint Denial of Service" and potentially T1068 which addresses "Exploitation for Privilege Escalation" in scenarios where local access can be leveraged for more extensive system compromise. The recommended mitigation strategy involves applying the appropriate IBM AIX security patches and updates that address the EMULATE_VMX implementation flaws. Organizations should also consider implementing monitoring solutions to detect unusual system behavior that might indicate exploitation attempts, and should ensure that local user access is properly controlled and audited. System administrators should prioritize upgrading to patched versions of IBM AIX 5.3 and consider implementing additional security controls to limit local user privileges where possible.