CVE-2012-1517 in ESXi
Summary
by MITRE
The VMX process in VMware ESXi 4.1 and ESX 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 function pointers.
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Analysis
by VulDB Data Team • 03/31/2025
The vulnerability identified as CVE-2012-1517 resides within the VMX process of VMware ESXi 4.1 and ESX 4.1 hypervisor implementations, representing a critical security flaw that undermines the fundamental isolation principles governing virtualized environments. This issue specifically targets the Remote Procedure Call (RPC) handling mechanisms within the virtual machine monitor, creating a pathway for malicious guest operating system users to exploit weaknesses in the hypervisor's internal communication protocols. The flaw manifests when the VMX process fails to properly validate and process RPC commands, leading to potential memory corruption and system instability. The vulnerability's classification as a denial of service condition stems from the ability of attackers to cause memory overwrite conditions that result in process crashes, while the arbitrary code execution capability indicates a more severe threat vector that could allow complete host compromise.
The technical implementation of this vulnerability involves improper handling of function pointers within the RPC command processing pipeline, creating a scenario where guest users can manipulate the hypervisor's execution flow through crafted RPC requests. This represents a classic buffer overflow or memory corruption vulnerability that exploits the trust relationship between guest and host environments. The flaw operates at the kernel level of the hypervisor, where function pointers are manipulated to redirect execution flow, potentially allowing attackers to execute malicious code with the privileges of the host operating system. The vulnerability's impact extends beyond simple service disruption as it compromises the integrity of the virtualization layer, undermining the security boundary that separates guest operating systems from the underlying host infrastructure. This type of flaw falls under the CWE-119 weakness category, which encompasses memory safety issues including buffer overflows and improper handling of function pointers.
The operational impact of CVE-2012-1517 presents significant risks to organizations relying on VMware virtualization environments, as successful exploitation can result in complete system compromise and data breaches. Attackers leveraging this vulnerability can cause unauthorized access to host resources, potentially leading to privilege escalation and lateral movement within the network infrastructure. The denial of service aspect creates availability risks that can disrupt critical business operations, while the arbitrary code execution capability enables persistent threats that may remain undetected for extended periods. Organizations utilizing affected VMware products face potential exposure to advanced persistent threats that exploit this vulnerability to establish backdoors, exfiltrate sensitive data, or use compromised systems as launch points for further attacks. The vulnerability's exploitation requires minimal privileges from the guest operating system, making it particularly dangerous as it can be leveraged by attackers who have gained limited access to virtual machines within the environment.
Mitigation strategies for CVE-2012-1517 focus on immediate patch deployment and operational security enhancements to protect against exploitation. VMware released security patches addressing this vulnerability through their regular update cycle, and organizations should prioritize immediate deployment of the relevant patches to remediate the issue. Network segmentation and access controls should be implemented to limit guest user privileges and reduce the attack surface available to potential exploiters. Monitoring systems should be enhanced to detect anomalous RPC command patterns and unusual memory access behaviors that may indicate exploitation attempts. The vulnerability's remediation aligns with ATT&CK technique T1055 for privilege escalation and T1499 for denial of service, making it a critical target for security operations teams to address through both preventive and detective controls. Organizations should also implement regular vulnerability assessments and penetration testing to identify similar weaknesses in their virtualization infrastructure and ensure comprehensive protection against similar threats that may exploit the same class of vulnerabilities in other systems or components.