Windows DNS Server Remote Code Execution Vulnerability CVE-2020-1350

A remote code execution vulnerability exists in Windows Domain Name System servers when certain requests are not properly handled. This issue results from a flaw in Microsoft’s DNS server role implementation. An attacker who successfully exploits the vulnerability could run arbitrary code in the context of the Local System Account. Windows servers that are configured as DNS servers are at risk as a result of this vulnerability.

To exploit the vulnerability, an unauthenticated attacker could send malicious requests to a Windows DNS server.

This vulnerability (CVE-2020-1350) is classified as a ‘wormable’ vulnerability and has a CVSS base score of 10. Wormable vulnerabilities have the potential to spread via malware between vulnerable computers without user interaction.

This issue affects the following Windows Server versions. Non-Microsoft DNS Servers are not affected.

• Microsoft Windows Server 2008
• Microsoft Windows Server 2008 R2
• Microsoft Windows Server 2012
• Microsoft Windows Server 2012 R2
• Microsoft Windows Server 2016
• Microsoft Windows Server 2019
• Microsoft Windows Server version 1803 (Server Core installation)
• Microsoft Windows Server version 1903 (Server Core installation)
• Microsoft Windows Server version 1909 (Server Core installation)
• Microsoft Windows Server version 2004 (Server Core installation)

Microsoft has patched this vulnerability in its July patch Tuesday updates. Users are encouraged to patch their systems as soon as possible.

SonicWall Capture Labs provides protection against this threat via the following signature:

• • • IPS 15069: Windows DNS Server Remote Code Execution (CVE-2020-1350) 1
    • IPS 15073: Windows DNS Server Remote Code Execution (CVE-2020-1350) 2
    • IPS 15074: Windows DNS Server Remote Code Execution (CVE-2020-1350) 3
    • IPS 15075: Windows DNS Server Remote Code Execution (CVE-2020-1350) 4
    • IPS 15076: Windows DNS Server Remote Code Execution (CVE-2020-1350) 5

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The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.