CVE-2020-1472 on CISA KEV

An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could run a specially crafted

01What CISA says about this vulnerability

An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could run a specially crafted application on a device on the network. To exploit the vulnerability, an unauthenticated attacker would be required to…

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• portal.msrc.microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1472
• www.kb.cert.org — https://www.kb.cert.org/vuls/id/490028
• www.openwall.com — http://www.openwall.com/lists/oss-security/2020/09/17/2
• usn.ubuntu.com — https://usn.ubuntu.com/4510-1/
• usn.ubuntu.com — https://usn.ubuntu.com/4510-2/
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00080.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00086.html
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• usn.ubuntu.com — https://usn.ubuntu.com/4559-1/
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/11/msg00041.html
• security.gentoo.org — https://security.gentoo.org/glsa/202012-24
• www.oracle.com — https://www.oracle.com/security-alerts/cpuApr2021.html
• packetstormsecurity.com — http://packetstormsecurity.com/files/159190/Zerologon-Proof-Of-Concept.html
• www.synology.com — https://www.synology.com/security/advisory/Synology_SA_20_21
• packetstormsecurity.com — http://packetstormsecurity.com/files/160127/Zerologon-Netlogon-Privilege-Escalat…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Microsoft	Windows Server version 2004	10.0.0
Microsoft	Windows Server 2019	10.0.0
Microsoft	Windows Server 2019 (Server Core installation)	10.0.0
Microsoft	Windows Server, version 1909 (Server Core installation)	10.0.0
Microsoft	Windows Server, version 1903 (Server Core installation)	10.0.0
Microsoft	Windows Server 2016	10.0.0
Microsoft	Windows Server 2016 (Server Core installation)	10.0.0
Microsoft	Windows Server 2008 R2 Service Pack 1	6.1.0
Microsoft	Windows Server 2008 R2 Service Pack 1 (Server Core installation)	6.0.0
Microsoft	Windows Server 2012	6.2.0
Microsoft	Windows Server 2012 (Server Core installation)	6.2.0
Microsoft	Windows Server 2012 R2	6.3.0
Microsoft	Windows Server 2012 R2 (Server Core installation)	6.3.0
Microsoft	Windows Server version 20H2	10.0.0

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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