#VU6449 Denial of service in Windows Server - CVE-2017-0171

Vulnerability identifier: #VU6449

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-0171

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to incorrect processing of malicious DNS queries by Windows DNS Server. A remote attacker can send specially crafted DNS queries and cause the cause the DNS Server service to become nonresponsive.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Windows Server: 2008 R2 - 2008, 2012 R2 - 2012, 2016 10.0.14393.10

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0171

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.