CVE-2007-2563 in HTTP File Upload ActiveX control
Summary
by MITRE
Buffer overflow in the AddFile function in VersalSoft HTTP File Upload ActiveX control (UFileUploaderD.dll) allows remote attackers to execute arbitrary code via a long argument.
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Analysis
by VulDB Data Team • 10/19/2017
The vulnerability identified as CVE-2007-2563 represents a critical buffer overflow flaw within the VersalSoft HTTP File Upload ActiveX control specifically in the AddFile function of the UFileUploaderD.dll component. This issue arises from inadequate input validation and memory management within the ActiveX control implementation, creating a condition where maliciously crafted input can overwrite adjacent memory locations. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which occurs when a program writes more data to a fixed-length buffer than it can accommodate, leading to memory corruption that can be exploited by attackers.
The technical exploitation of this vulnerability requires an attacker to craft a specially formatted argument that exceeds the allocated buffer size in the AddFile function. When the ActiveX control processes this malformed input, the excessive data overflows into adjacent memory segments, potentially overwriting critical program variables, return addresses, or function pointers. This memory corruption can be leveraged to redirect program execution flow and execute arbitrary code with the privileges of the affected application. The vulnerability is particularly dangerous in web environments where ActiveX controls are automatically loaded and executed by Internet Explorer, making it a prime target for drive-by download attacks and remote code execution scenarios.
From an operational perspective, this vulnerability poses significant risks to organizations relying on the VersalSoft HTTP File Upload ActiveX control for file upload functionality. The remote exploitation capability means that attackers can compromise systems without requiring local access or user interaction beyond visiting a malicious website. The attack surface is broad as the vulnerability affects any system running Internet Explorer with the vulnerable ActiveX control installed, potentially impacting enterprise networks, web applications, and individual user machines. The severity of the impact is compounded by the fact that such ActiveX controls are often used in business-critical applications for document management, file sharing, and web-based file upload processes, making the exploitation potentially devastating for organizations.
Organizations should implement immediate mitigations including disabling the vulnerable ActiveX control through Internet Explorer security settings, deploying application whitelisting policies to prevent execution of the malicious DLL, and applying available vendor patches or updates to the VersalSoft component. System administrators should also monitor network traffic for exploitation attempts and implement intrusion detection systems to identify potential exploitation activities. The vulnerability aligns with ATT&CK technique T1059.007 for execution through ActiveX components and T1203 for exploitation of remote services, making it a critical target for security teams implementing defense-in-depth strategies. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all instances of the vulnerable ActiveX control across their network infrastructure and ensure proper patch management processes are in place to prevent similar issues in the future.