CVE-2012-2448 in ESXi
Summary
by MITRE
VMware ESXi 3.5 through 5.0 and ESX 3.5 through 4.1 allow remote attackers to execute arbitrary code or cause a denial of service (memory overwrite) via NFS traffic.
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Analysis
by VulDB Data Team • 03/24/2021
The vulnerability identified as CVE-2012-2448 represents a critical security flaw affecting VMware ESXi and ESX hypervisor versions ranging from 3.5 through 5.0 and 3.5 through 4.1 respectively. This vulnerability specifically targets the Network File System (NFS) implementation within these hypervisor versions, creating a pathway for remote attackers to exploit the system through network-based attacks. The flaw manifests in the way these hypervisor versions handle NFS traffic, allowing malicious actors to manipulate memory structures and potentially execute arbitrary code or induce system crashes. This vulnerability directly impacts the foundational security of virtualized environments where NFS is utilized for storage operations, making it particularly dangerous in enterprise environments that rely heavily on VMware virtualization technologies. The vulnerability's classification aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a classic example of how network protocols can be exploited to compromise system integrity and availability.
The technical exploitation of this vulnerability occurs through malformed NFS traffic that triggers memory overwrite conditions within the affected VMware hypervisor implementations. When the hypervisor processes malicious NFS packets, the insufficient input validation and memory management mechanisms cause buffer overflows that can be leveraged to overwrite critical memory locations. Attackers can craft specific NFS traffic patterns that force the hypervisor to write data beyond allocated memory boundaries, potentially leading to code execution in the context of the hypervisor process. This memory corruption can result in unpredictable behavior including system crashes, denial of service conditions, or in more severe cases, complete system compromise where attackers gain elevated privileges to execute arbitrary code. The exploitation requires network access to the affected hypervisor systems and can be performed remotely without authentication, making it particularly dangerous in unsecured network environments.
The operational impact of CVE-2012-2448 extends beyond simple denial of service scenarios to encompass potential complete system compromise and data integrity violations. Organizations running affected VMware hypervisor versions face significant risks including unauthorized access to virtual machines, potential data breaches, and disruption of critical business operations. The vulnerability affects the core hypervisor functionality, meaning that successful exploitation can compromise the entire virtualization infrastructure rather than individual virtual machines. This makes the impact particularly severe for data centers and cloud environments where multiple virtual machines depend on a single compromised hypervisor. The vulnerability also creates opportunities for attackers to establish persistent access points within virtualized environments, potentially enabling lateral movement attacks and escalation of privileges across the virtual infrastructure. Organizations may experience extended downtime and recovery costs when systems are compromised, as the memory corruption can lead to system instability and data loss.
Mitigation strategies for CVE-2012-2448 primarily focus on immediate patching and configuration hardening measures. VMware released patches addressing this vulnerability in subsequent updates, making it essential for organizations to apply these security updates promptly. System administrators should also implement network segmentation and access controls to limit NFS traffic to trusted sources only. Disabling NFS functionality when not required provides an additional layer of protection, while monitoring network traffic for unusual NFS patterns can help detect potential exploitation attempts. The implementation of network intrusion detection systems can provide early warning of malicious NFS traffic patterns, and regular security assessments should verify that all affected systems have been properly updated. Organizations should also maintain detailed inventory records of all VMware installations to ensure comprehensive vulnerability management and avoid oversight of systems running older versions that may be vulnerable to this and similar exploits. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches in virtualized environments and demonstrates how network-based protocols can create attack surfaces that require careful monitoring and protection.