Patch

CVE-2020-17052

with vRx

Vulnerability Overview

CVE Name

CVE-2020-17052

Severity

7.5

High

CVE Description

Scripting Engine Memory Corruption Vulnerability

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Latest Patch info

There is no patch available at the moment, but you can use our script.

Patch Name

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17052

Date

11.11.2020

Script

Script Type

Remediation script

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This script will mitigate the CVE-2020-17052 according to the official mitigation instructions at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17052 by automating the mitigation instructions & process. More about CVE-2020-17052: https://nvd.nist.gov/vuln/detail/CVE-2020-17052

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# Check if running as administrator
if (-not ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
    Write-Host "[-] This script must be run as an administrator."
    exit 1
}

# Create a new throttling policy with EWSMaxSubscriptions set to 0
$policyName = "AllUsersEWSSubscriptionBlockPolicy"
$ewsMaxSubscriptions = 0

try {
    Write-Host "Creating throttling policy: $policyName"
    New-ThrottlingPolicy -Name $policyName -EwsMaxSubscriptions $ewsMaxSubscriptions -ThrottlingPolicyScope Organization -Confirm:$false
    Write-Host "[+] Throttling policy created successfully."
}
catch {
    Write-Host "[-] Failed to create the throttling policy. Install ExchangePowerShell Module"
    exit 1
}

# Apply the throttling policy to the organization
try {
    Write-Host "Applying throttling policy to the organization"
    Set-ThrottlingPolicyAssociation -Identity $policyName -OrganizationScope -Confirm:$false
    Write-Host "[+] Throttling policy applied to the organization successfully."
}
catch {
    Write-Host "[-] Failed, Run on windows server."
    exit 1
}

Write-Host "[+] Mitigation applied successfully. The throttling policy has been created and applied to the organization."

# Prompt the user to enter the port numbers to block
$blockedPorts = Read-Host "(Optional) Enter the port numbers (comma-separated) you want to block. Or enter to pass"

if (-not [string]::IsNullOrWhiteSpace($blockedPorts)) {
    $blockedPorts = $blockedPorts -split ',' | ForEach-Object { $_.Trim() }

foreach ($port in $blockedPorts) {
        try {
            Write-Host "Blocking incoming traffic on port: $port"
            New-NetFirewallRule -DisplayName "Block Port $port" -Direction Inbound -LocalPort $port -Protocol TCP -Action Block
            Write-Host "[+] Incoming traffic on port $port is blocked."
        }
        catch {
            Write-Host "[-] Failed to block incoming traffic on port $port."
        }
    }
}
else {
    Write-Host "[-] No ports were provided. Skipping firewall rule creation."
}

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Affected OS & Apps

Edge

Microsoft

Internet Explorer

Microsoft

Windows Server 2019

Microsoft

4.8

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