On July 14, 2020, Microsoft released an update for CVE-2020-1350, a Critical Remote Code Execution (RCE) vulnerability in Windows DNS Server that is classified as a wormable vulnerability and has a Common Vulnerability Scoring System (CVSS) base score of 10.0. This issue results from a flaw in Microsoft’s DNS server role implementation and affects all Windows Server versions. Non-Microsoft DNS Servers are not affected.
Analysis
Wormable vulnerabilities have the potential to spread via malware between vulnerable computers without user interaction. Windows DNS Server is a core networking component. While this vulnerability is not currently known to be used in active attacks, it is essential that customers apply Windows updates to address this vulnerability as soon as possible.
Impacted Systems
- Windows Server 2003-2019
Recommendations
While this vulnerability is not currently known to be used in active attacks, it is essential that system administrators apply Windows updates to address this vulnerability as soon as possible.
If applying the update quickly is not practical, a registry-based workaround is available that does not require restarting the server. The update and the workaround are both detailed in CVE-2020-1350.
References
July 2020 Security Update: CVE-2020-1350 Vulnerability in Windows Domain Name System (DNS) Server
Microsoft Security Update Guide
17-Year-Old Critical 'Wormable' RCE Vulnerability Impacts Windows DNS Servers
