Microsoft warns of wormable vulnerability in Windows DNS Server

by Hilbert Hagedoorn on: 07/15/2020 08:26 AM | source: checkpoint.com | 5 comment(s)

Windows DNS Server holds a seventeen-year-old significant vulnerability, which is named as wormable and has the most important possible risk score. Administrators should update Windows Server systems as soon as possible.

Today we released an update for CVE-2020-1350, a Critical Remote Code Execution (RCE) vulnerability in Windows DNS Server that is classified as a ‘wormable’ vulnerability and has a CVSS base score of 10.0. This issue results from a flaw in Microsoft’s DNS server role implementation and affects all Windows Server versions. Non-Microsoft DNS Servers are not affected.

Wormable vulnerabilities have the potential to spread via malware between vulnerable computers without user interaction. Windows DNS Server is a core networking component. While this vulnerability is not currently known to be used in active attacks, it is essential that customers apply Windows updates to address this vulnerability as soon as possible.

If applying the update quickly is not practical, a registry-based workaround is available that does not require restarting the server. The update and the workaround are both detailed in CVE-2020-1350.

Customers with automatic updates turned on do not need to take any additional action.

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sverek

Posts: 6073
Joined: 2011-01-02

#5809146 Posted on: 07/15/2020 08:37 AM

Ah yes, Windows. A black box full of surprises!

Rich_Guy
Senior Member

Posts: 12705
Joined: 2003-05-11

#5809311 Posted on: 07/15/2020 04:23 PM

Im sure this got plugged in yesterdays security updates, along with the other 100+

BetA
Senior Member

Posts: 4376
Joined: 2008-03-03

#5809334 Posted on: 07/15/2020 05:06 PM

heres teh workaround...

If applying these patches is not currently feasible, Microsoft provided a workaround

via a Windows registry modification:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters

DWORD = TcpReceivePacketSize

Value = 0xFF00

In order for these changes to take effect, the DNS Service must be restarted.
Microsoft recommends removing the workaround after patches have been applied.

i guess im in the clear, since im NOT USING the windows DNS Service (its disabled here) :p
DNSCryptProxy all the way baby...

still, i shall update my system tonight....

anticupidon
Senior Member

Posts: 6291
Joined: 2008-03-06

#5809670 Posted on: 07/16/2020 02:52 PM

SigRED

Mda400
Senior Member

Posts: 971
Joined: 2008-07-10

#5809798 Posted on: 07/16/2020 08:39 PM

I disabled Windows Update a long time ago. It is useless because Windows is never secured at any point of its life. I use Windows only for gaming, don't keep any personal info on it or do anything else. I format it every month anyways.

He's vulnerable, get 'em boys!

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