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CVE-2021-1675

Scores

EPSS

0.943High94.3%
0%20%40%60%80%100%

Percentile: 94.3%

CVSS

7.8High3.x
0246810

CVSS Score: 7.8/10

All CVSS Scores

CVSS 3.x
7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS 2.0
9.3

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Description

Windows Print Spooler Remote Code Execution Vulnerability

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Sources

msrcnvd

Related Vulnerabilities

BDU:2021-03322

Exploits

Exploit ID: CVE-2021-1675

Source: github-poc

URL: https://github.com/Sp4ceDogy/NPE-CS-V-CVE-2021-1675

Recommendations

Source: nvd

Apply an updateMicrosoft has addressed this issue in the updates for CVE-2021-34527. Note that the Microsoft update for CVE-2021-34527 does not effectively prevent exploitation of systems where the Point and Print NoWarningNoElevationOnInstall is set to a non-0 value. Microsoft indicates that systems that have NoWarningNoElevationOnInstall is set to a non-0 value are vulnerable by design. For systems that do not have the CVE-2021-34527 installed, or have Point and Print configured insecurely, please consider the following workarounds:Apply a workaroundMicrosoft has listed several workarounds in their advisory for CVE-2021-34527. Specifically:Microsoft Option 1 - Stop and disable the Print Spooler serviceThis vulnerability can be mitigated by stopping and disabling the Print Spooler service in Windows.If disabling the Print Spooler service is appropriate for your enterprise, use the following PowerShell commands:Stop-Service -Name Spooler -ForceSet-Service -Name Spooler -StartupType DisabledImpact of workaround Disabling the Print Spooler service disables the ability to print both locally and remotely.Microsoft Option 2 - Disable inbound remote printing through Group PolicyDisable the “Allow Print Spooler to accept client connections:” policy to block remote attacks.Impact of workaround This policy will block the remote attack vector by preventing inbound remote printing operations. The system will no longer function as a print server, but local printing to a directly attached device will still be possible.Note: The Print Spooler service must be restarted for this workaround to be activated.Block RPC and SMB ports at the firewallLimited testing has shown that blocking both the RPC Endpoint Mapper (135/tcp) and SMB (139/tcp and 445/tcp) incoming traffic at a host-based firewall level can prevent remote exploitation of this vulnerability. Note that blocking these ports on a Windows system may prevent expected capabilities from functioning properly, especially on a system that functions as a server.Enable security prompts for Point and PrintEnsure that the Windows Point and Print Restrictions are set to Show warning and elevation prompt for both installing and updating drivers in the Windows Group Policy. Specifically the HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint\ key should have NoWarningNoElevationOnInstall and UpdatePromptSettings entries that are both set to 0.Restrict printer driver installation ability to administratorsAfter the Microsoft update for CVE-2021-34527 is installed, a registry value called RestrictDriverInstallationToAdministrators in the HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint\ key is checked, which is intended to restrict printer driver installation to only administrator users. Please see KB5005010 for more details.

URL: https://www.kb.cert.org/vuls/id/383432

Vulnerable Software (32)

Type: Configuration

Vendor: microsoft

Product: windows_10_1507

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_10_1607

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_10_1809

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_10_1909

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_10_2004

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_10_20h2

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_10_21h1

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_7

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_8.1

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: microsoft

Product: windows_rt_8.1

Operating System: * * *

Trait: 
{
  "cpe_match": [
    {
      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",
      "versionEndExcluding": "10.0.10240.18967",
      "vulnerable": true
    },
    {
      "cpe23uri...

Source: nvd