CVE-2008-3697 in Server
Summary
by MITRE
An unspecified ISAPI extension in VMware Server before 1.0.7 build 108231 allows remote attackers to cause a denial of service (IIS crash) via a malformed request.
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Analysis
by VulDB Data Team • 12/30/2024
The vulnerability identified as CVE-2008-3697 represents a critical security flaw in VMware Server's ISAPI extension component that predates the widely recognized security standards and practices of the time. This issue affects VMware Server versions prior to build 108231 and specifically targets the Internet Information Services IIS infrastructure that VMware Server utilizes for web-based management operations. The vulnerability manifests through an unspecified ISAPI extension that fails to properly validate incoming requests, creating a potential attack vector for remote adversaries seeking to disrupt service availability. ISAPI extensions serve as critical components that integrate with IIS to provide additional functionality, and when these extensions contain memory corruption or input validation flaws, they can be exploited to crash the hosting web server.
The technical nature of this vulnerability stems from inadequate request handling within the ISAPI extension module, which processes incoming HTTP requests from remote clients. When a malicious actor crafts a specifically malformed request that exploits buffer overflows, improper input parsing, or memory corruption patterns, the extension fails to properly sanitize or reject the malformed data. This lack of proper input validation allows the crafted request to traverse the normal request processing pipeline and ultimately trigger an unhandled exception or memory corruption within the IIS process. The result is a complete denial of service condition where the IIS web server crashes and becomes unavailable to legitimate users, effectively rendering the VMware Server management interface inaccessible.
From an operational perspective, this vulnerability presents significant risk to organizations utilizing VMware Server for virtualization management, particularly in enterprise environments where continuous availability is critical. The remote exploitation capability means that attackers do not require local access or credentials to compromise the system, making this vulnerability particularly dangerous in networked environments. The impact extends beyond simple service disruption as IIS crashes can potentially affect other applications running on the same server, leading to cascading failures. Organizations relying on VMware Server for critical infrastructure management would face operational downtime that could last from minutes to hours depending on recovery procedures, potentially disrupting virtual machine operations, user access, and administrative functions.
The vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios, though the specific implementation details are not fully disclosed in the CVE description. From an ATT&CK framework perspective, this vulnerability maps to T1499.004, which covers network denial of service attacks, and potentially T1566.001 for initial access through web application exploitation. The attack surface is particularly concerning as it targets the management interface of virtualization platforms, which are often exposed to external networks for administrative access. Organizations should consider implementing network segmentation, access controls, and monitoring solutions to detect unusual traffic patterns that might indicate exploitation attempts.
Mitigation strategies for this vulnerability should prioritize immediate patching of VMware Server installations to version 1.0.7 or later, which contains the necessary fixes for the ISAPI extension validation issues. Network administrators should implement restrictive firewall rules that limit access to the VMware Server management interface to trusted administrative networks only, reducing the attack surface available to remote adversaries. Additionally, implementing intrusion detection systems capable of identifying malformed HTTP requests and monitoring IIS process stability can provide early warning of potential exploitation attempts. Regular security assessments of virtualization management interfaces and maintaining up-to-date security patches across all VMware components remain essential practices to prevent similar vulnerabilities from compromising system availability. Organizations should also consider implementing redundant management interfaces or alternative access methods to ensure continued operational capability during potential service disruptions.