CVE-2007-3038 in Windows
Summary
by MITRE
The Teredo interface in Microsoft Windows Vista and Vista x64 Edition does not properly handle certain network traffic, which allows remote attackers to bypass firewall blocking rules and obtain sensitive information via crafted IPv6 traffic, aka "Windows Vista Firewall Blocking Rule Information Disclosure Vulnerability."
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Analysis
by VulDB Data Team • 06/08/2025
The CVE-2007-3038 vulnerability represents a critical flaw in the Teredo tunneling implementation within Microsoft Windows Vista and its x64 variant, specifically affecting the network security mechanisms designed to protect systems from unauthorized access. This vulnerability resides in the IPv6 transition technology that enables Windows Vista systems to communicate through IPv4 networks while maintaining IPv6 connectivity, creating a potential attack surface that adversaries could exploit to circumvent established firewall protections. The Teredo protocol serves as a mechanism for IPv6 connectivity in environments where IPv6 is not natively supported, but its implementation in Windows Vista contained fundamental design flaws that compromised the integrity of the system's network security posture.
The technical flaw manifests in how the Teredo interface processes specific types of IPv6 traffic, particularly when handling certain packet structures and network communication patterns that are not properly validated or filtered by the system's security mechanisms. This improper handling of network traffic allows attackers to craft malicious IPv6 packets that can bypass the standard firewall rules that should prevent unauthorized access to the system. The vulnerability specifically affects the Windows Vista Firewall implementation, which relies on proper traffic classification and filtering to maintain network security boundaries. When the Teredo interface encounters crafted IPv6 traffic, it fails to properly authenticate or validate the incoming packets, enabling attackers to inject traffic that appears legitimate to the firewall system while actually containing malicious payloads or attempting to establish unauthorized connections.
The operational impact of this vulnerability extends beyond simple firewall bypass, as it creates a pathway for remote attackers to gain access to sensitive information that should remain protected by the system's network security controls. Attackers can leverage this vulnerability to gather information about the internal network structure, system configurations, and potentially access restricted network resources that would normally be blocked by firewall rules. The implications for enterprise security are significant, as Windows Vista systems running this vulnerable implementation could serve as entry points for broader network infiltration attempts, particularly in environments where IPv6 connectivity is enabled but not properly secured. The vulnerability affects systems that have Teredo enabled, which is typically activated when IPv6 connectivity is required but IPv6 is not natively supported by the underlying network infrastructure.
The attack surface for this vulnerability aligns with the ATT&CK framework's tactics related to privilege escalation and defense evasion, as attackers can use the information disclosure aspect to gather intelligence about target systems while simultaneously bypassing network security controls that would normally prevent such access. This vulnerability represents a classic case of insufficient input validation and improper access control implementation, which maps directly to CWE-20 (Improper Input Validation) and CWE-284 (Improper Access Control) categories within the Common Weakness Enumeration system. Organizations that deploy Windows Vista systems with Teredo enabled face particular risk, especially in environments where the firewall rules are expected to provide comprehensive protection against external threats, as this vulnerability undermines the fundamental security assumptions underlying the network protection architecture.
Mitigation strategies for CVE-2007-3038 require immediate implementation of security patches provided by Microsoft, which address the specific Teredo interface flaws that allow unauthorized traffic bypass. System administrators should disable Teredo functionality on Windows Vista systems where it is not essential for IPv6 connectivity, particularly in environments where the underlying network infrastructure does not properly support IPv6 protocols. Network security configurations should include additional monitoring of IPv6 traffic patterns and implementation of more robust traffic filtering rules that can detect and block anomalous Teredo-related communications. Organizations should also consider implementing network segmentation strategies that limit the exposure of Windows Vista systems to external networks, while ensuring that any IPv6 connectivity requirements are properly secured through alternative means that do not rely on potentially vulnerable tunneling protocols. Regular security assessments should verify that Teredo is disabled on systems where it is not required, and network traffic analysis should be employed to detect any attempts to exploit this vulnerability through crafted IPv6 traffic patterns.