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Microsoft Patches Critical Windows DNS Client Vulnerabilities

October 11, 2017

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Three critical Windows DNS client vulnerabilities were patched today by Microsoft, closing off an avenue where an attacker could relatively simply respond to DNS queries with malicious code and gain arbitrary code execution on Windows clients or Windows Server installations.

The flaws were discovered and privately disclosed to Microsoft by researcher Nick Freeman at Bishop Fox. An attacker on the local network or in a man-in-the-middle position could insert a malicious payload into a DNS response to a Windows machine’s DNS request and trigger the vulnerability.

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