CVE-2011-1789 in vCenter
Summary
by MITRE
The self-extracting installer in the vSphere Client Installer package in VMware vCenter 4.0 before Update 3 and 4.1 before Update 1, VMware ESXi 4.x before 4.1 Update 1, and VMware ESX 4.x before 4.1 Update 1 does not have a digital signature, which might make it easier for remote attackers to spoof the software distribution via a Trojan horse installer.
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Analysis
by VulDB Data Team • 08/05/2024
The vulnerability described in CVE-2011-1789 represents a critical security flaw in VMware's vSphere Client installer packages across multiple product versions. This weakness specifically targets the self-extracting installer component that is part of the vCenter 4.0 and ESXi 4.x software distribution mechanisms. The absence of digital signature validation creates an exploitable condition that undermines the integrity of the software installation process and compromises the trust model that organizations rely upon for secure software deployment.
The technical flaw manifests in the lack of cryptographic verification within the installer package itself, which allows malicious actors to potentially substitute legitimate installation files with malicious counterparts. This vulnerability falls under the broader category of code injection and software supply chain attacks as defined by CWE-494, where the integrity of downloadable software components is compromised. The vulnerability specifically relates to CWE-311, which addresses the absence of proper data protection mechanisms, and CWE-506, which deals with the presence of malicious code in software.
The operational impact of this vulnerability extends beyond simple software installation risks, as it creates a pathway for sophisticated attackers to execute malicious code during the installation process. Attackers could potentially replace the legitimate installer with a Trojan horse version that appears authentic to end users while executing unauthorized actions on target systems. This threat vector aligns with ATT&CK technique T1195.001, which covers the use of supply chain compromise for initial access and persistence. Organizations using affected VMware products face significant risk of unauthorized system compromise, data exfiltration, and potential lateral movement within their networks.
The vulnerability affects a substantial portion of VMware's vSphere ecosystem, including vCenter 4.0 before Update 3, vCenter 4.1 before Update 1, ESXi 4.x before 4.1 Update 1, and ESX 4.x before 4.1 Update 1. This widespread exposure across multiple versions indicates the fundamental nature of the flaw in the software distribution mechanism. The attack surface is particularly concerning given that vCenter and ESXi are core components of enterprise virtualization infrastructure, making successful exploitation potentially devastating for organizational security posture. The lack of digital signature validation means that even when users believe they are installing legitimate software, they may unknowingly execute malicious payloads that can establish persistent backdoors or perform other unauthorized operations.
Mitigation strategies for this vulnerability primarily focus on immediate patch deployment and enhanced software verification processes. Organizations should prioritize updating to the affected VMware product versions that include digital signature validation, specifically VMware vCenter 4.0 Update 3 and 4.1 Update 1, as well as ESXi 4.1 Update 1 and ESX 4.1 Update 1. Beyond patching, enterprises should implement additional verification measures such as hash checking of downloaded installer packages, network segmentation to limit exposure, and enhanced monitoring for unauthorized software installations. The implementation of proper code signing practices and certificate validation should be reinforced across all software distribution channels to prevent similar vulnerabilities from emerging in future deployments. Additionally, security teams should establish robust incident response procedures to detect and respond to potential exploitation attempts targeting this specific vulnerability.