CVE-2012-1194 in Windows
Summary
by MITRE
The resolver in the DNS Server service in Microsoft Windows Server 2008 before R2 overwrites cached server names and TTL values in NS records during the processing of a response to an A record query, which allows remote attackers to trigger continued resolvability of revoked domain names via a "ghost domain names" attack.
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Analysis
by VulDB Data Team • 05/09/2018
The vulnerability described in CVE-2012-1194 represents a critical flaw in the DNS Server service implementation within Microsoft Windows Server 2008 and earlier versions. This issue specifically affects the resolver functionality that processes DNS queries and maintains cached responses. The vulnerability stems from improper handling of NS record updates during A record query responses, creating a persistent security risk that enables attackers to manipulate DNS resolution behavior. The flaw exists in the core DNS server infrastructure that manages domain name resolution for networked systems, making it particularly dangerous for enterprise environments where DNS services are heavily relied upon for network operations.
The technical mechanism behind this vulnerability involves the DNS server's resolver incorrectly overwriting cached server names and TTL values in NS records when processing response data from A record queries. This behavior creates a condition where revoked domain names can maintain continued resolvability through cached entries that should have expired or been invalidated. The attack vector requires remote exploitation without authentication, as attackers can craft malicious DNS responses that manipulate the cache state of authoritative servers. This specific flaw falls under the category of cache poisoning attacks and can be categorized as CWE-1103, which deals with improper handling of DNS cache entries. The vulnerability exploits the fundamental DNS resolution process where authoritative servers maintain caches of resource records to improve performance, but the improper update mechanism allows attackers to inject malicious data.
The operational impact of CVE-2012-1194 extends beyond simple DNS resolution failures, creating potential for significant network disruption and security compromise. Organizations running affected Windows Server 2008 systems face the risk of persistent DNS cache poisoning that can redirect traffic to malicious destinations, enabling man-in-the-middle attacks and credential theft. The "ghost domain names" attack pattern allows adversaries to maintain continued access to services that should have been revoked or decommissioned, creating persistent backdoors within network infrastructure. This vulnerability directly impacts the integrity of DNS resolution and can be mapped to ATT&CK technique T1071.004 for application layer protocol: dns, as it exploits DNS protocols to maintain unauthorized access. The attack can result in extended periods of unauthorized network access, potentially lasting until cache expiration or system restart, making it particularly challenging to detect and remediate.
Mitigation strategies for this vulnerability require immediate patching of affected systems with Microsoft security updates, as the flaw cannot be effectively addressed through configuration changes alone. Organizations should implement DNS security measures including DNSSEC deployment to provide cryptographic validation of DNS responses, which can help detect and prevent cache poisoning attacks. Network monitoring should be enhanced to detect unusual DNS query patterns and cache behavior that might indicate exploitation attempts. The vulnerability also highlights the importance of proper DNS cache management and regular cache invalidation procedures. Security teams should consider implementing DNS sinkholing capabilities to redirect known malicious domains and establish robust incident response procedures for DNS-related security events. Additionally, organizations should review their DNS infrastructure design to minimize the impact of such vulnerabilities through proper isolation and monitoring of DNS services, ensuring that critical network functions remain resilient against cache manipulation attacks.