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* Microsoft Windows 2000 Server Service Pack 4
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition Service Pack 2
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium-based Systems
* Microsoft Windows 2000 Professional Service Pack 4
* Windows XP Service Pack 2
* Windows XP Professional x64 Edition and Windows XP Professional x64 Edition Service Pack 2
* Windows Vista
* Windows Vista x64
Mitigating Factors for DNS Spoofing Attack Vulnerability:
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. Microsoft has not identified any mitigations for this vulnerability.
Workarounds for DNS Spoofing Attack Vulnerability:
Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has not identified any workarounds for this vulnerability.
FAQ for DNS Spoofing Attack Vulnerability:
What is the scope of the vulnerability?
A spoofing vulnerability exists in Windows DNS Severs. An attacker who successfully exploited this vulnerability could impersonate a legitimate address.
What causes the vulnerability?
The Windows DNS Server service doesn't provide enough entropy in its random choice of transaction values when it sends out queries to upstream DNS servers.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could gain information about the DNS server s transaction IDs, and use that information to send malicious responses to DNS requests, thus redirecting Internet traffic from legitimate locations to an address of the attacker s choice.
How could an attacker exploit the vulnerability?
An attacker who successfully exploited this vulnerability could respond to a DNS query with false or misleading information, thereby redirecting Internet traffic from legitimate locations.
Could the vulnerability be exploited over the Internet?
Yes, an attacker could exploit this vulnerability over the Internet by sending specific responses to an Internet-facing DNS server that is performing recursive lookups.
What systems are primarily at risk from the vulnerability?
This vulnerability applies to Windows DNS servers that perform recursive lookups. For more information on recursive queries, please refer to the Technet article on How DNS query works.
What does the update do?
The update removes this vulnerability by increasing the randomness of the transaction IDs in recursive DNS server communications.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.