Zerologon — Microsoft Windows Server 1903 Vulnerability
CVE-2020-1472
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 use MS-NRPC to connect to a domain controller to obtain domain administrator access. Microsoft is addressing the vulnerability in a phased two-part rollout. These updates address the vulnerability by modifying how Netlogon handles the usage of Netlogon secure channels. For guidelines on how to manage the changes required for this vulnerability and more information on the phased rollout, see How to manage the changes in Netlogon secure channel connections associated with CVE-2020-1472 (updated September 28, 2020). When the second phase of Windows updates become available in Q1 2021, customers will be notified via a revision to this security vulnerability. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this advisory. See Microsoft Technical Security Notifications.
EPSS: 0.995 (99.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Microsoft Windows_server_1903
- Microsoft Windows_server_1909
- Microsoft Windows_server_2004
- Microsoft Windows_server_2008 — versions r2
- Microsoft Windows Server 2008 R2 Service Pack 1 — versions 6.1.0
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core Installation) — versions 6.0.0
- Microsoft Windows Server 2012 — versions 6.2.0
- Microsoft Windows_server_2012 — versions r2
- Microsoft Windows Server 2012 R2 — versions 6.3.0
- Microsoft Windows Server 2012 R2 (Server Core Installation) — versions 6.3.0
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- secure@microsoft.com (Patch, x_refsource_MISC, Vendor Advisory)
- secure@microsoft.com (US Government Resource, x_refsource_CERT-VN, Third Party Advisory, third-party-advisory)
- secure@microsoft.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secure@microsoft.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- secure@microsoft.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
- secure@microsoft.com (x_refsource_FEDORA, vendor-advisory, Mailing List, Third Party Advisory)
- secure@microsoft.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- secure@microsoft.com (vendor-advisory, Mailing List, Third Party Advisory, x_refsource_SUSE)
- secure@microsoft.com (x_refsource_FEDORA, vendor-advisory, Mailing List, Third Party Advisory)
- secure@microsoft.com (x_refsource_FEDORA, vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1472?
- CVE-2020-1472 is a medium-severity vulnerability in Microsoft Windows Server 1903. CVSS score: 5.5/10. Published 2020-08-17.
- How severe is CVE-2020-1472?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2020-1472 known to be exploited?
- Yes. CVE-2020-1472 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 482 public proof-of-concept repositories are indexed.