Denial of service in Windows DNS Server



Published: 2020-05-20
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE ID N/A
CWE ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Input validation error

Risk: Medium

CVSSv3: 6.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C] [PCI]

CVE-ID: N/A

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing DNS requests. While resolving a name from the attacker client, for each referral record found, the resolver contacts the victim domain. This action can generate a large number of communications between the recursive resolver and the victim's authoritative DNS server to cause a Distributed Denial of Service (DDoS) attack.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Windows Server: 2008, 2008 R2, 2008 R2 SP1, 2008 SP2, 2012, 2012 R2, 2016, 2019, 2019 1709, 2019 1803, 2019 1903, 2019 1909

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200009

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.