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Actively exploited · Published Aug 17, 2020 · Assigned by microsoft

CVE-2020-1472Netlogon Elevation of Privilege Vulnerability

Medium 5.5 Exploited Ransomware

In plain English

A medium-severity security flaw in Windows Server 2008 R2 Service Pack 1 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 99.4% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)99.4%top 0.1% of all CVEs
Exploited in the wildYesCISA KEV since Nov 3, 2021
Attack tooling2Metasploit, Public PoC

CISA guidance

Apply updates per vendor instructions.

Federal agencies must remediate by May 3, 2022.

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8libsmbclient-devel4.13.3-3.el8ALSA-2021:1647
AlmaLinux:8libwbclient-devel4.13.3-3.el8ALSA-2021:1647
AlmaLinux:8openchange2.3-27.el8ALSA-2021:1647
AlmaLinux:8samba-devel4.13.3-3.el8ALSA-2021:1647
Alpine:v3.20samba4.12.7-r0ALPINE-CVE-2020-1472
Alpine:v3.21samba4.12.7-r0ALPINE-CVE-2020-1472
Alpine:v3.22samba4.12.7-r0ALPINE-CVE-2020-1472
Alpine:v3.23samba4.12.7-r0ALPINE-CVE-2020-1472
Alpine:v3.24samba4.12.7-r0ALPINE-CVE-2020-1472
Debian:12samba2:4.13.2+dfsg-2DEBIAN-CVE-2020-1472
Debian:13samba2:4.13.2+dfsg-2DEBIAN-CVE-2020-1472
Debian:14samba2:4.13.2+dfsg-2DEBIAN-CVE-2020-1472
Rocky Linux:8openchange0:2.3-27.el8RLSA-2021:1647
Rocky Linux:8samba0:4.13.3-3.el8RLSA-2021:1647

Affected products (as reported)

VendorProductVersions
Microsoft Windows Server version 2004 10.0.0 – before publication
Microsoft Windows Server 2019 10.0.0 – before publication
Microsoft Windows Server 2019 (Server Core installation) 10.0.0 – before publication
Microsoft Windows Server, version 1909 (Server Core installation) 10.0.0 – before publication
Microsoft Windows Server, version 1903 (Server Core installation) 10.0.0 – before publication
Microsoft Windows Server 2016 10.0.0 – before publication
Microsoft Windows Server 2016 (Server Core installation) 10.0.0 – before publication
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.0 – before publication
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.0.0 – before publication
Microsoft Windows Server 2012 6.2.0 – before publication
Microsoft Windows Server 2012 (Server Core installation) 6.2.0 – before publication
Microsoft Windows Server 2012 R2 6.3.0 – before publication
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.0 – before publication
Microsoft Windows Server version 20H2 10.0.0 – before publication

References