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nvd[email protected]NVD:CVE-2021-34527
HistoryJul 02, 2021 - 10:15 p.m.

CVE-2021-34527

2021-07-0222:15:08
CWE-269
web.nvd.nist.gov
1

9 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:L/Au:S/C:C/I:C/A:C

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.967 High

EPSS

Percentile

99.7%

<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p>
<p>UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability.</p>
<p>In addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (<strong>Note</strong>: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ):</p>
<ul>
<li>HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint</li>
<li>NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting)</li>
<li>UpdatePromptSettings = 0 (DWORD) or not defined (default setting)</li>
</ul>
<p><strong>Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design.</strong></p>
<p>UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also <a href=“https://support.microsoft.com/topic/31b91c02-05bc-4ada-a7ea-183b129578a7”>KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates</a>.</p>
<p>Note that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.</p>

Affected configurations

NVD
Node
microsoftwindows_10_1507Range<10.0.10240.18969
OR
microsoftwindows_10_1607Range<10.0.14393.4470
OR
microsoftwindows_10_1809Range<10.0.17763.2029
OR
microsoftwindows_10_20h2Range<10.0.19042.1083
OR
microsoftwindows_10_21h2Range<10.0.19044.1415
OR
microsoftwindows_10_22h2Range<10.0.19045.2251
OR
microsoftwindows_11_21h2Range<10.0.22000.318
OR
microsoftwindows_11_22h2Range<10.0.22621.674
OR
microsoftwindows_7Match-sp1
OR
microsoftwindows_8.1Match-
OR
microsoftwindows_rt_8.1Match-
OR
microsoftwindows_server_2008Match-sp2
OR
microsoftwindows_server_2008Matchr2sp1x64
OR
microsoftwindows_server_2012Match-
OR
microsoftwindows_server_2012Matchr2
OR
microsoftwindows_server_2016Range<10.0.14393.4470
OR
microsoftwindows_server_2019Range<10.0.17763.2029
OR
microsoftwindows_server_2022Range<10.0.20348.230
OR
microsoftwindows_server_20h2Range<10.0.19042.1083

9 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:L/Au:S/C:C/I:C/A:C

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.967 High

EPSS

Percentile

99.7%