CVE-2005-2765 in Windows
Summary
by MITRE
the user interface in the windows firewall does not properly display certain malformed entries in the windows registry which makes it easier for attackers with administrator privileges to hide activities if the administrator only uses the windows firewall interface to monitor exceptions. note: the vendor disputes this issue saying that since administrative privileges are already required it is not a vulnerability. cve has not yet formally decided if such "information hiding" issues should be included.
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Analysis
by VulDB Data Team • 04/10/2019
The vulnerability described in CVE-2005-2765 relates to a user interface flaw within the Windows Firewall component that affects how the graphical interface handles malformed registry entries. This issue specifically impacts the Windows Firewall user interface which is designed to allow administrators to manage network exceptions and firewall rules through a visual interface rather than direct registry manipulation. The flaw occurs when the firewall interface fails to properly display certain malformed entries that have been inserted into the Windows registry, creating a potential information hiding mechanism that could be exploited by malicious actors.
The technical nature of this vulnerability stems from improper input validation and display handling within the Windows Firewall graphical user interface. When registry entries contain malformed data structures or invalid formatting, the interface should ideally either reject such entries or display them in a way that alerts administrators to their problematic nature. However, the flaw allows these malformed entries to be displayed in a manner that obscures their true nature or makes them appear as legitimate firewall exceptions. This behavior creates a situation where an attacker with administrative privileges can insert malicious registry entries that will not be clearly visible through normal interface usage, effectively allowing them to hide their activities from administrators who rely solely on the graphical interface for monitoring firewall exceptions.
From an operational perspective, this vulnerability represents a significant concern for system administrators who depend on the Windows Firewall interface for monitoring network security policies. The flaw essentially provides a covert channel for malicious actors to establish persistent network access or hide existing malicious activities without detection through normal administrative monitoring procedures. Since the Windows Firewall interface is designed to be the primary tool for managing firewall exceptions, administrators may not notice the presence of hidden malicious entries if they only use the interface for monitoring rather than direct registry inspection. This creates a false sense of security where administrators believe their firewall configuration is secure and complete when in fact it may contain hidden malicious entries that could be used for lateral movement or persistent access to the system.
The vulnerability demonstrates characteristics that align with CWE-691, which addresses insufficient input validation and improper handling of malformed data within user interfaces. The issue also relates to ATT&CK technique T1562.001, which covers "Disable or Modify Tools" where adversaries may modify system configurations to avoid detection. The vendor's position that administrative privileges are already required for exploitation does not adequately address the security implications of this information hiding mechanism, as it still allows for covert persistence and activity concealment. This type of vulnerability highlights the importance of considering both the attack surface and the potential for information hiding as security concerns, particularly when dealing with system components that serve as primary monitoring and management interfaces.
While the vendor disputes the classification of this issue as a vulnerability, the potential for exploitation remains significant when considering that administrative privileges are often already compromised in targeted attacks. The vulnerability essentially provides a stealth mechanism that could be leveraged by attackers who have already gained administrative access to a system, making it easier to maintain persistence and avoid detection through normal administrative monitoring procedures. This type of vulnerability also underscores the need for comprehensive security auditing that includes not just functional validation but also consideration of how security interfaces handle edge cases and malformed data. The lack of formal classification by CVE reflects the ongoing debate within the security community about whether information hiding mechanisms that require existing privileges should be classified as vulnerabilities, though the practical security implications remain significant for system administrators and security practitioners who must consider the full attack surface of their systems.