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.

Comments
Microsoft Remote Access Protocol Flaw Affects All Windows Machines
Newest First  |  Oldest First  |  Threaded View
tdsan
50%
50%
tdsan,
User Rank: Ninja
3/15/2018 | 1:21:55 PM
I do think there is a better way than mentioned by the engineer/developer
Cut and paste this code into a rdp.ps1 file, then run it in Admin mode (powershell of course), this will lock down the admin group (requires encryption and authentication) so the user will not be able to circumvent the key, they have another mechanism of authentication and integrity (make sure you are running Powershell 5.1, you can verify that by running $PSVersionTable).

 

# Identify Administrators Group
$users = New-Object -TypeName System.Security.Principal.NTAccount ("Administrators")

# Security Principles for users accessing systems, Ids the SID value
$SIDofSecureUserGroup = $users.Translate([System.Security.Principal.SecurityIdentifier]).Value

# Secure User Groups found in the Administrators Group
$SecureUserGroupSDDL = "D:(A;;CC;;; $SIDofSecureUserGroup)"
#$SecureMachineGroupSDDL = "D:(A;;CC;;; $SIDofSecureUserGroup)"


# Remote Desktop DisplayName for individual rules
$rule = (Get-NetFirewallRule -DisplayName "Remote Desktop*").DisplayName
    foreach ($i in $rule) {
        Set-NetFirewallRule -DisplayName $i -Profile "Private"
    }

# Set Remote Desktop, add Builtin\Administrators groups to the filter
$nfSecurityFilter = Get-NetFirewallRule -DisplayName "Remote Desktop*" | Get-NetFirewallSecurityFilter

# Set NetFirewallSecurity Filter Settings for Authorized Users, login required for local users, Authorize and Encrypt the session
#Set-NetFirewallSecurityFilter -RemoteUser $SecureMachineGroupSDDL -InputObject $nfSecurityFilter -Authentication Required -Encryption Required
Set-NetFirewallSecurityFilter -RemoteUser $SecureUserGroupSDDL -InputObject $nfSecurityFilter -Authentication Required -Encryption Required

#This cmdlet can be run using only the pipeline.
foreach ($i in $rule) {
    Get-NetFirewallRule -DisplayName $i | Get-NetFirewallSecurityFilter | Set-NetFirewallSecurityFilter -RemoteUser $SecureUserGroupSDDL -Authentication Required -Encryption Required
    #Get-NetFirewallRule -DisplayName $i | Get-NetFirewallSecurityFilter | Set-NetFirewallSecurityFilter -RemoteMachine $SecureMachineGroupSDDL -Authentication Required -Encryption Required
}

#This cmdlet can be run without the pipeline.
#Set-NetFirewallRule -DisplayName "Remote Desktop*" -RemoteMachine $SecureMachineGroupSDDL

Get-NetFirewallRule -DisplayName "Remote Desktop*" | out-file $env:USERPROFILE\desktop\fwrules.txt -Append
Get-NetFirewallRule -DisplayName "Remote Desktop*" | Get-NetFirewallSecurityFilter | out-file $env:USERPROFILE\desktop\fwfilter.txt -Append

 

Result:



 





Commentary
What the FedEx Logo Taught Me About Cybersecurity
Matt Shea, Head of Federal @ MixMode,  6/4/2021
Edge-DRsplash-10-edge-articles
A View From Inside a Deception
Sara Peters, Senior Editor at Dark Reading,  6/2/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
The State of Cybersecurity Incident Response
In this report learn how enterprises are building their incident response teams and processes, how they research potential compromises, how they respond to new breaches, and what tools and processes they use to remediate problems and improve their cyber defenses for the future.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-31811
PUBLISHED: 2021-06-12
In Apache PDFBox, a carefully crafted PDF file can trigger an OutOfMemory-Exception while loading the file. This issue affects Apache PDFBox version 2.0.23 and prior 2.0.x versions.
CVE-2021-31812
PUBLISHED: 2021-06-12
In Apache PDFBox, a carefully crafted PDF file can trigger an infinite loop while loading the file. This issue affects Apache PDFBox version 2.0.23 and prior 2.0.x versions.
CVE-2021-32552
PUBLISHED: 2021-06-12
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the openjdk-16 package apport hooks, it could expose private data to other local users.
CVE-2021-32553
PUBLISHED: 2021-06-12
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the openjdk-17 package apport hooks, it could expose private data to other local users.
CVE-2021-32554
PUBLISHED: 2021-06-12
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the xorg package apport hooks, it could expose private data to other local users.