CVE-2012-1516 in ESXi
Summary
by MITRE
The VMX process in VMware ESXi 3.5 through 4.1 and ESX 3.5 through 4.1 does not properly handle RPC commands, which allows guest OS users to cause a denial of service (memory overwrite and process crash) or possibly execute arbitrary code on the host OS via vectors involving data pointers.
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Analysis
by VulDB Data Team • 02/06/2025
The vulnerability identified as CVE-2012-1516 represents a critical security flaw within VMware's virtualization infrastructure affecting ESXi versions 3.5 through 4.1 and ESX versions 3.5 through 4.1. This issue resides in the VMX process which serves as the core virtual machine monitor component responsible for managing guest operating system execution and host resource allocation. The flaw manifests through improper handling of Remote Procedure Call (RPC) commands that are essential for communication between guest and host systems. The vulnerability operates at the intersection of virtualization security and operating system integrity, creating a pathway for malicious actors to exploit the communication protocols that maintain isolation between virtual machines and their underlying host environments.
The technical implementation of this vulnerability stems from insufficient validation of data pointers within the RPC command processing mechanism of the VMX process. When guest operating systems submit RPC commands to the host, the VMX process fails to properly validate the integrity and bounds of data pointers contained within these commands. This validation failure creates opportunities for memory corruption through controlled pointer manipulation that can result in memory overwrite conditions. The flaw specifically affects how the system handles pointer arithmetic and memory access patterns during RPC processing, allowing attackers to craft malicious RPC commands that can manipulate memory addresses beyond their intended boundaries.
The operational impact of CVE-2012-1516 extends beyond simple denial of service conditions to potentially enable arbitrary code execution on the host operating system. Attackers can leverage this vulnerability to escalate privileges from guest OS level to host OS level, effectively breaking the isolation that virtualization platforms are designed to maintain. The memory overwrite conditions can be exploited to redirect execution flow, inject malicious code into the host process memory space, or corrupt critical system structures that maintain virtual machine isolation. This represents a severe privilege escalation vulnerability that can compromise entire virtualized environments and potentially lead to complete system takeover when combined with other exploitation techniques.
From a cybersecurity perspective, this vulnerability aligns with CWE-125: Out-of-bounds Read and CWE-787: Out-of-bounds Write, both of which are fundamental memory safety issues that have historically led to remote code execution exploits. The ATT&CK framework categorizes this vulnerability under T1055: Process Injection and T1068: Exploitation for Privilege Escalation, as attackers can leverage the VMX process to inject malicious code into host processes and escalate their privileges from guest to host level. The attack surface is particularly concerning in enterprise environments where multiple virtual machines share the same host infrastructure, as a successful exploitation could potentially compromise all VMs running on the affected host system.
Mitigation strategies for CVE-2012-1516 require immediate patching of affected VMware ESXi and ESX systems to the latest security releases that address the RPC command validation flaws. Organizations should implement network segmentation to limit access to virtualization management interfaces and restrict guest OS privileges to reduce exploitation risk. System administrators should also deploy monitoring solutions that can detect anomalous RPC command patterns or memory access violations that may indicate exploitation attempts. Additionally, implementing virtualization-specific security controls such as VM encryption, secure boot mechanisms, and regular security assessments can help reduce the overall attack surface and improve detection capabilities for similar vulnerabilities in the virtualization stack.