CVE-2002-1325 in Virtual Machine
Summary
by MITRE
Microsoft Virtual Machine (VM) build 5.0.3805 and earlier allows remote attackers to determine a local user s username via a Java applet that accesses the user.dir system property, aka "User.dir Exposure Vulnerability."
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Analysis
by VulDB Data Team • 09/06/2025
The CVE-2002-1325 vulnerability represents a significant information disclosure flaw within Microsoft Virtual Machine versions 5.0.3805 and earlier, where remote attackers can exploit a Java applet to access the user.dir system property and extract local usernames. This vulnerability specifically targets the Microsoft Virtual Machine implementation that was commonly used in Internet Explorer to execute Java applets, creating a pathway for attackers to gather sensitive system information through seemingly benign web-based interactions. The flaw stems from insufficient access controls and property exposure mechanisms within the virtual machine's security model, allowing untrusted code to access system properties that should remain restricted to authorized processes.
The technical exploitation of this vulnerability occurs when a malicious Java applet is executed within a vulnerable Microsoft Virtual Machine environment. The applet accesses the user.dir system property which typically contains the user's home directory path, often including the username as part of the directory structure. When this property is accessible to untrusted code, it directly reveals the local username of the system user running the virtual machine, providing attackers with valuable reconnaissance information that can be used for further exploitation attempts. This exposure violates fundamental security principles of least privilege and proper isolation between trusted and untrusted code execution environments.
The operational impact of CVE-2002-1325 extends beyond simple username disclosure, as this information can serve as a crucial stepping stone for more sophisticated attacks. Attackers can combine the exposed username information with other reconnaissance data to conduct targeted social engineering campaigns, credential guessing attacks, or to tailor more specific exploitation techniques against the identified user accounts. The vulnerability demonstrates a critical failure in the security architecture of the Microsoft Virtual Machine, where system-level properties that should be protected from untrusted code execution are accessible through improper access control mechanisms. This type of information disclosure vulnerability aligns with CWE-200, which specifically addresses "Information Exposure" and represents a common attack vector in web application and virtual machine security contexts.
From an adversary perspective, this vulnerability maps directly to ATT&CK technique T1082, "System Information Discovery," where attackers seek to gather information about the target system environment. The exposure of user directory information provides attackers with fundamental system identification data that can be leveraged for privilege escalation attempts or to create more convincing phishing attacks. Organizations running vulnerable Microsoft Virtual Machine versions face significant risk as this vulnerability can be exploited through standard web browsing activities without requiring any special privileges or specialized tools. The attack surface is particularly concerning because it operates at the browser level where users typically have less security awareness and where legitimate web content can be easily corrupted with malicious applets.
Mitigation strategies for CVE-2002-1325 primarily involve updating to Microsoft Virtual Machine versions that address the information disclosure vulnerability, which typically includes implementing proper access controls for system properties and restricting untrusted code access to sensitive environment variables. System administrators should also consider disabling Java applet execution in web browsers where possible, implementing proper network segmentation to limit exposure, and monitoring for suspicious Java applet activity. The vulnerability highlights the importance of maintaining current security patches and demonstrates the necessity of proper sandboxing mechanisms in virtual machine implementations. Organizations should also implement security awareness training to help users recognize potentially malicious web content and establish proper monitoring procedures to detect unauthorized access attempts to system properties through Java applets.