CVE-2021-45231

Summary

Release Date: December 29, 2021
CVE Identifier(s): CVE-2021-44024, CVE-2021-45231, CVE-2021-45440 through 45442
Platform(s): Windows
CVSS 3.0 Score(s): 6.1 - 7.8
Severity Rating(s): Medium - High

Trend Micro has released new patches for Trend Micro Apex One and Trend Micro Worry-Free Business Security that resolves vulnerabilities related to link following denial-of-service and privilege escalation vulnerabilities.

Details

Public

Affected Version(s)

Product

Affected Version(s)

Platform

Language(s)

Apex One

2019 (On-prem)

Windows

English

Apex One

SaaS

Windows

English

Worry-Free Business Security (WFBS)

10.0 SP1

Windows

English

Worry-Free Business Service Services (WFBSS)

SaaS

Windows

English

**
Solution**

Trend Micro has released the following solutions to address the issue:

Product

Updated version

Notes

Platform

Availability

Apex One

Patch 6 B10048

Readme

Windows

Available Now

Apex One as a Service

October 2021 Release

Readme

Windows

Already Deployed

WFBS

10.0 SP1 Patch 2368

Readme

Windows

Available Now

WFBSS

October 2021 Hotfix

Windows

Already Deployed

* Please note that some of the vulnerabilities listed below may be addressed by earlier patches, however it is highly recommended that the latest version is applied to ensure ALL known vulnerabilities are addressed.

These are the minimum recommended version(s) of the patches and/or builds required to address the issue. Trend Micro highly encourages customers to obtain the latest version of the product if there is a newer one available than the one listed in this bulletin.

Customers are encouraged to visit Trend Micro’s Download Center to obtain prerequisite software (such as Service Packs) before applying any of the solutions above.

**
Vulnerability Details**

CVE-2021-44024: Link Following Denial-of-Service Vulnerability
CVSSv3: 6.1: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
A link following denial-of-service vulnerability in Trend Micro Apex One (on-prem and SaaS) and Trend Micro Worry-Free Business Security (10.0 SP1 and Services) could allow a local attacker to overwrite arbitrary files in the context of SYSTEM.

Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

CVE-2021-45231: Link Following Privilege Escalation Vulnerability
CVSSv3: 7.8: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
A link following privilege escalation vulnerability in Trend Micro Apex One (on-prem and SaaS) and Trend Micro Worry-Free Business Security (10.0 SP1 and Services) could allow a local attacker to create a specially crafted file with arbitrary content which could grant local privilege escalation on the affected system.

Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

CVE-2021-45440: Unnecessary Privileges Local Privilege Escalation Vulnerability
CVSSv3: 7.0: AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
A unnecessary privilege vulnerability in Trend Micro Apex One and Trend Micro Worry-Free Business Security 10.0 SP1 (on-prem versions only) could allow a local attacker to abuse an impersonation privilege and elevate to a higher level of privileges.

Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

CVE-2021-45441: Origin Validation Error Local Privilege Escalation Vulnerability
CVSSv3: 7.8: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
A origin validation error vulnerability in Trend Micro Apex One (on-prem and SaaS) could allow a local attacker drop and manipulate a specially crafted file to issue commands over a certain pipe and elevate to a higher level of privileges.

Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

CVE-2021-45442: Trend Micro Worry-Free Business Security Link Following Denial-of-Service Vulnerability
CVSSv3: 6.1: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
A link following denial-of-service vulnerability in Trend Micro Worry-Free Business Security (on prem only) could allow a local attacker to overwrite arbitrary files in the context of SYSTEM.

This is similar to, but not the same as CVE-2021-44024.

Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

**
Mitigating Factors**

Exploiting these type of vulnerabilities generally require that an attacker has access (physical or remote) to a vulnerable machine. In addition to timely application of patches and updated solutions, customers are also advised to review remote access to critical systems and ensure policies and perimeter security is up-to-date.

However, even though an exploit may require several specific conditions to be met, Trend Micro strongly encourages customers to update to the latest builds as soon as possible.

**
Acknowledgement**

Trend Micro would like to thank the following individuals for responsibly disclosing these issues and working with Trend Micro to help protect our customers:

• Abdelhamid Naceri (halov) working with Trend Micro’s Zero Day Initiative
• Michael DePlante (@izobasi) of the Trend Micro’s Zero Day Initiative
• Lays (@_L4ys) of TrapaSecurity working with Trend Micro’s Zero Day Initiative

**
External Reference(s)**

• ZDI-CAN-13364
• ZDI-CAN-13365
• ZDI-CAN-14218
• ZDI-CAN-14607
• ZDI-CAN-14967

Premium

Internal

Partner

Rating:

Category:

Update

Solution Id:

000289996

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