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Vulnerability in DNS Allows Spoofing (MS07-062)
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SUMMARY
A spoofing vulnerability exists in Windows DNS Servers. The vulnerability
could allow non-privileged users to send malicious responses to DNS
requests, thereby spoofing or redirecting Internet traffic from legitimate
locations.
DETAILS
Affected Software:
* 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
Non-Affected Software:
* 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
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3898>
CVE-2007-3898
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.
ADDITIONAL INFORMATION
The information has been provided by Microsoft Security Bulletin.
The original article can be found at:
<http://www.microsoft.com/technet/security/bulletin/ms07-062.mspx>
http://www.microsoft.com/technet/security/bulletin/ms07-062.mspx
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