CVE-2008-0087 in Windows
Summary
by MITRE
The DNS client in Microsoft Windows 2000 SP4, XP SP2, Server 2003 SP1 and SP2, and Vista uses predictable DNS transaction IDs, which allows remote attackers to spoof DNS responses.
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Analysis
by VulDB Data Team • 06/01/2025
The vulnerability described in CVE-2008-0087 represents a critical weakness in the DNS client implementation across multiple Microsoft Windows operating systems including Windows 2000 SP4, XP SP2, Server 2003 SP1 and SP2, and Vista. This flaw stems from the predictable nature of DNS transaction identifiers used by these systems, creating a pathway for sophisticated man-in-the-middle attacks that can compromise network security and data integrity. The vulnerability specifically targets the fundamental DNS resolution process that Windows systems rely upon for domain name lookups and network communication.
The technical root cause of this vulnerability lies in the insufficient randomness of DNS transaction IDs generated by the Windows DNS client implementation. According to CWE-330, this represents a weakness in entropy or randomness generation where the system uses predictable pseudo-random number generation algorithms instead of cryptographically secure methods. The DNS transaction ID serves as a critical mechanism for correlating DNS requests and responses, and when this identifier becomes predictable, attackers can exploit this weakness to inject malicious DNS responses into network traffic. The vulnerability is classified under the broader category of DNS cache poisoning attacks, which fall within the ATT&CK technique T1071.301 for Application Layer Protocol: DNS.
The operational impact of this vulnerability is severe and far-reaching across enterprise networks and individual systems. Attackers can leverage the predictable transaction IDs to perform DNS spoofing attacks that redirect users to malicious websites, intercept sensitive network communications, and potentially compromise authentication mechanisms. This vulnerability enables attackers to manipulate DNS resolution results without requiring direct network access to the target systems, making it particularly dangerous in environments where network monitoring is limited. The attack vector is particularly effective because it requires minimal privileges and can be executed remotely against vulnerable systems.
Mitigation strategies for CVE-2008-0087 should focus on implementing proper DNS security measures and system updates. Microsoft addressed this vulnerability through security updates that improved the randomness of DNS transaction ID generation, but organizations must ensure all affected systems receive these patches promptly. Additional defensive measures include implementing DNS Security Extensions (DNSSEC) to provide cryptographic authentication of DNS data, deploying network intrusion detection systems to monitor for suspicious DNS traffic patterns, and configuring systems to use secure DNS servers that implement proper transaction ID randomization. Organizations should also consider network segmentation and monitoring to detect potential DNS spoofing attempts that could exploit this vulnerability.
The vulnerability demonstrates the critical importance of proper entropy generation in security protocols and highlights the long-term impact of predictable random number generation in network security implementations. This weakness serves as a reminder that even fundamental network protocols can contain critical flaws when proper cryptographic practices are not followed during implementation. The vulnerability also illustrates how seemingly minor implementation details in security protocols can create significant attack surfaces that can be exploited by adversaries with relatively simple techniques. Organizations should maintain comprehensive vulnerability management programs that include regular security assessments to identify and remediate similar weaknesses in their network infrastructure and application implementations.