Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

2/11/2021
01:50 PM
50%
50%

Microsoft Launches Phase 2 Mitigation for Zerologon Flaw

The Netlogon remote code execution vulnerability, disclosed last August, has been weaponized by APT groups.

Microsoft has released phase two mitigation for the critical Zerologon vulnerability disclosed in August 2020. CVE-2020-1472 is an elevation of privilege flaw affecting the Windows Netlogon Remote Protocol (MS-NRPC).

Related Content:

6 Things to Know About the Microsoft 'Zerologon' Flaw

Special Report: How IT Security Organizations are Attacking the Cybersecurity Problem

New From The Edge: Unemployment Fraud: As If Being Out of Work Wasn't Bad Enough

MS-NRPC is a core authentication component of Active Directory. This vulnerability exists when an attacker creates a vulnerable Netlogon secure channel connection to a domain controller using MS-NRPC. With that connection, an attacker doesn't need to authenticate in order to elevate their privileges and become an administrator. An unauthenticated attacker could use this access to run arbitrary code on affected Windows domain controllers. 

Concerns about Zerologon quickly escalated after Microsoft issued the first part of its mitigation in August. In mid-September, publicly available exploit code was discovered. Shortly after, the DHS' Cybersecurity and Infrastructure Security Agency (CISA) issued an emergency directive requiring federal agencies to mitigate the flaw by midnight on Sept. 21.

It didn't take long for advanced attackers to add Zerologon to their toolkits. In October 2020, Iranian APT group Mercury was seen using the vulnerability in a series of attacks that Microsoft detected.

Now Microsoft has released the second of its two-part mitigation.

Starting with the Feb. 9, 2021, security update, Windows Domain Controllers will be placed in enforcement mode. This requires all Windows and non-Windows devices to use secure Remote Procedure Call (RPC) with Netlogon secure channel. This update will block vulnerable connections from noncompliant devices, unless those devices are manually given an exception to allow vulnerable Netlogon secure channel connections. 

Read the CISA alert and Microsoft security update for more details.

Dark Reading's Quick Hits delivers a brief synopsis and summary of the significance of breaking news events. For more information from the original source of the news item, please follow the link provided in this article. View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
News
Former CISA Director Chris Krebs Discusses Risk Management & Threat Intel
Kelly Sheridan, Staff Editor, Dark Reading,  2/23/2021
Edge-DRsplash-10-edge-articles
Security + Fraud Protection: Your One-Two Punch Against Cyberattacks
Joshua Goldfarb, Director of Product Management at F5,  2/23/2021
News
Cybercrime Groups More Prolific, Focus on Healthcare in 2020
Robert Lemos, Contributing Writer,  2/22/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win an Amazon Gift Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
2021 Top Enterprise IT Trends
We've identified the key trends that are poised to impact the IT landscape in 2021. Find out why they're important and how they will affect you today!
Flash Poll
Building the SOC of the Future
Building the SOC of the Future
Digital transformation, cloud-focused attacks, and a worldwide pandemic. The past year has changed the way business works and the way security teams operate. There is no going back.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-27132
PUBLISHED: 2021-02-27
SerComm AG Combo VD625 AGSOT_2.1.0 devices allow CRLF injection (for HTTP header injection) in the download function via the Content-Disposition header.
CVE-2021-25284
PUBLISHED: 2021-02-27
An issue was discovered in through SaltStack Salt before 3002.5. salt.modules.cmdmod can log credentials to the info or error log level.
CVE-2021-3144
PUBLISHED: 2021-02-27
In SaltStack Salt before 3002.5, eauth tokens can be used once after expiration. (They might be used to run command against the salt master or minions.)
CVE-2021-3148
PUBLISHED: 2021-02-27
An issue was discovered in SaltStack Salt before 3002.5. Sending crafted web requests to the Salt API can result in salt.utils.thin.gen_thin() command injection because of different handling of single versus double quotes. This is related to salt/utils/thin.py.
CVE-2021-3151
PUBLISHED: 2021-02-27
i-doit before 1.16.0 is affected by Stored Cross-Site Scripting (XSS) issues that could allow remote authenticated attackers to inject arbitrary web script or HTML via C__MONITORING__CONFIG__TITLE, SM2__C__MONITORING__CONFIG__TITLE, C__MONITORING__CONFIG__PATH, SM2__C__MONITORING__CONFIG__PATH, C__M...