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kasperskyKaspersky LabKLA12337
HistoryNov 09, 2021 - 12:00 a.m.

KLA12337 Multiple vulnerabilities in Microsoft Office

2021-11-0900:00:00
Kaspersky Lab
threats.kaspersky.com
37

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

8.3 High

AI Score

Confidence

High

0.034 Low

EPSS

Percentile

91.5%

Multiple vulnerabilities were found in Microsoft Office. Malicious users can exploit these vulnerabilities to bypass security restrictions, execute arbitrary code.

Below is a complete list of vulnerabilities:

  1. A security feature bypass vulnerability in Microsoft Excel can be exploited remotely to bypass security restrictions.
  2. A remote code execution vulnerability in Microsoft Excel can be exploited remotely to execute arbitrary code.
  3. A remote code execution vulnerability in Microsoft Word can be exploited remotely to execute arbitrary code.
  4. A remote code execution vulnerability in Microsoft Access can be exploited remotely to execute arbitrary code.

Original advisories

CVE-2021-42292

CVE-2021-40442

CVE-2021-42296

CVE-2021-41368

Exploitation

Public exploits exist for this vulnerability.

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.

Related products

Microsoft-Office

Microsoft-Excel

Microsoft-SharePoint

CVE list

CVE-2021-42292 critical

CVE-2021-40442 critical

CVE-2021-42296 critical

CVE-2021-41368 high

KB list

5002072

5002056

4486670

5002032

5002065

5002035

5002038

5002063

5002053

Solution

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

Impacts

  • ACE

Arbitrary code execution. Exploitation of vulnerabilities with this impact can lead to executing by abuser any code or commands at vulnerable machine or process.

  • SB

Security bypass. Exploitation of vulnerabilities with this impact can lead to performing actions restricted by current security settings.

Affected Products

  • Microsoft Office Online ServerMicrosoft Office 2019 for MacMicrosoft Office 2016 (32-bit edition)Microsoft Office 2013 RT Service Pack 1Microsoft Office 2016 (64-bit edition)Microsoft Excel 2013 Service Pack 1 (64-bit editions)Microsoft Office 2019 for 32-bit editionsMicrosoft 365 Apps for Enterprise for 32-bit SystemsMicrosoft Office 2013 Service Pack 1 (32-bit editions)Microsoft Excel 2016 (32-bit edition)Microsoft 365 Apps for Enterprise for 64-bit SystemsMicrosoft Office Web Apps Server 2013 Service Pack 1Microsoft Office 2013 Service Pack 1 (64-bit editions)Microsoft Excel 2016 (64-bit edition)Microsoft Excel 2013 Service Pack 1 (32-bit editions)Microsoft Excel 2013 RT Service Pack 1Microsoft Office LTSC 2021 for 32-bit editionsMicrosoft Office LTSC for Mac 2021Microsoft Office 2019 for 64-bit editionsMicrosoft SharePoint Enterprise Server 2013 Service Pack 1Microsoft Office LTSC 2021 for 64-bit editions

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

8.3 High

AI Score

Confidence

High

0.034 Low

EPSS

Percentile

91.5%