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SECURITY BULLETIN: July 28, 2021, Security Bulletin for Trend Micro Apex One and Apex One as a Service

    • Updated:
    • 28 Jul 2021
    • Product/Version:
    • Apex One 2019
    • Apex One as a Service XG
    • Platform:
Summary
Release Date: July 28, 2021
CVE Identifier(s): CVE-2021-32464, CVE-2021-32465, CVE-2021-36741, CVE-2021-36742
Platform(s): Windows
CVSS 3.0 Score(s): 7.1 - 7.8
Severity Rating(s): High

Trend Micro has released new patches for Trend Micro Apex One (On Premise) and Apex One as a Service (SaaS). These patches resolve multiple vulnerabilities related to incorrect permission assignment privilege escalation, incorrect permission preservation authentication bypass, arbitrary file upload, and local privilege escalation.

 
Please note - Trend Micro has observed an active attempt of exploitation against two of these vulnerabilities (chained) in-the-wild (ITW) in a very limited number of instances, and we have been in contact with these customers already.  All customers are strongly encouraged to update to the latest versions as soon as possible.
 
Details
Public

Affected Version(s)

ProductAffected Version(s)PlatformLanguage(s)
Apex One2019 (On-prem)
SaaS
Windows
Windows
English
English


Solution

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

ProductUpdated versionNotesPlatformAvailability
Apex One (on-prem)CP 9601
Readme
WindowsNow Available
Apex One as a Service (SaaS)July 2021 Monthly PatchReadmeWindowsNow Available

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-2021-32464: Incorrect Permission Assignment Privilege Vulnerability
CVSSv3: 7.8: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
An incorrect permission assignment privilege escalation vulnerability in Trend Micro Apex One and Apex One as a Service could allow an attacker to modify a specific script before it is executed.

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-2021-32465: Incorrect Permission Preservation Authentication Bypass Vulnerability
CVSSv3: 7.5: AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
An incorrect permission preservation vulnerability in Trend Micro Apex One and Apex One as a Service could allow a remote user to perform an attack and bypass authentication on affected installations.

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-2021-36741: Arbitrary File Upload Vulnerability
CVSSv3: 7.1: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
An improper input validation vulnerability in Trend Micro Apex One and Apex One as a Service allows a remote attached to upload arbitrary files on affected installations.

Please note: an attacker must first obtain the ability to logon to the product’s management console in order to exploit this vulnerability.
 
ITW Alert: Trend Micro has observed at least one active attempt of potential exploitation of this vulnerability in-the-wild in connection with CVE-2021-36742.
 

CVE-2021-36742: Local Privilege Escalation Vulnerability
CVSSv3: 7.8: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
A improper input validation vulnerability in Trend Micro Apex One and Apex One as a Service allows a local attacker to escalate privileges on affected installations.

Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
 
ITW Alert: Trend Micro has observed at least one active attempt of potential exploitation of this vulnerability in-the-wild in connection with CVE-2021-36741.
 


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:


External Reference(s)

The following advisories may be found at Trend Micro's Zero Day Initiative Published Advisories site:
  • ZDI-CAN-12851
  • ZDI-CAN-13769
Premium
Internal
Partner
Rating:
Category:
Update
Solution Id:
000287819
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