Monday, January 18, 23:28
Home security Microsoft: Update KB4586786 creates error on Kerberos

Microsoft: Update KB4586786 creates error on Kerberos

Microsoft is working to fix a bug in last week's update KB4586786 that caused a bug in the Kerberos Key Distribution Center (KDC) security feature.

Kerberos

Microsoft has highlighted the issue that affects systems they have install patch KB4586786 for CVE-2020-17049 error, one of 112 vulnerabilities encountered in Patch Tuesday, November 2020.

Kerberos is a widely used client-server authentication protocol Operating Systems, including Windows. Microsoft tried to fix a bypass in Kerberos KDC, one ability which handles tickets for encrypting messages between server and client.

"After installing KB4586786 on domain controllers (DCs) and read-only domain controllers (RODCs) in your environment, you may experience Kerberos authentication problems," Microsoft said in a statement. issues for all supported versions of Windows 10.

"This is due (to a problem) to the way CVE-2020-17049 was delivered in these updates."

The patch only affects Windows Servers, Windows 10 devices, and applications in corporate environments, according to Microsoft.

Microsoft addresses the vulnerability by changing the way KDC validates service tickets used with Kerberos Constrained Delegation (KCD) because there was an issue bypass how the KDC determines whether a service token can be used to authorize the KCD.

Microsoft explains that there are three registry configuration values ​​- 0, 1, and 2 - for PerformTicketSignature for control, but administrators may experience different issues with each regulation.

"We are analyzing the information and will provide an update as soon as more information is available," Microsoft said.

Microsoft has also revised its update instructions. Administrators are advised to locate the KDC registry subkey and, if present in the system, make sure that it is set to 1. Next, the managers must complete development on all DCs - and Read-Only DCs.

“Note that following our original instructions for using the 0 setting could cause problems with the feature S4USer of Kerberos. "We are working to address this issue."

Source: zdnet.com

LEAVE ANSWER

Please enter your comment!
Please enter your name here

Teo Ehc
Teo Ehchttps://www.secnews.gr
Be the limited edition.

LIVE NEWS

00:02:29

FCC: Extremists turn to radio equipment after banning from social media

The US government warns that extremists could turn to radio equipment to plan their future attacks, ...

Android: How to make Signal the default messaging app

Signal is a popular encrypted messaging application that focuses on privacy. It is an alternative to ...

Google Cloud: We use some SolarWinds, but we were not affected by the hack

Google Cloud CISO Phil Venables has revealed that the cloud uses software from the vendor, SolarWinds, but states that the use ...

Scotland Environment Service: ransomware continues to affect us

The Scottish Environmental Protection Agency (SEPA) has confirmed that it was hit by a ransomware attack last month and continues to face ...

Backdoors and vulnerabilities were discovered in FiberHome routers

Backdoors and other vulnerabilities have been discovered in the firmware of a popular FiberHome FTTH ONT router. FTTH ONT stands for Fiber-to-the-Home Optical Network ...

GitHub apologizes to an employee who fired! What happened;

GitHub has admitted that it was wrong to fire a Jewish official who made "anti-Nazi" comments about the Capitol riots.

By 2030 AI will replace the people of cybersecurity

Security company Trend Micro recently conducted a new survey that reveals that more than two-fifths (41%) of IT leaders believe ...

Chinese Winnti APT targets organizations in Russia and other countries!

Security researchers at Positive Technologies have uncovered a series of attacks carried out by a Chinese APT hacking team targeting organizations in Russia ...

Silicon Valley is investing a huge amount of money in India

From March to November, even when COVID-19 destroyed economies around the world, the richest man in India ...
00:02:01

Microsoft, Salesforce, Oracle are designing a digital vaccination passport

A Covid digital vaccination passport is being developed jointly by a team of health and technology companies, as well as governments, airlines and ...