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SECURITY BULLETIN: Trend Micro OfficeScan XG Hard Link Privilege Escalation Vulnerability

    • Updated:
    • 26 Apr 2021
    • Product/Version:
    • OfficeScan XG
    • Platform:
Updated: September 24, 2020
Original Bulletin Release Date: August 28, 2020
CVE Identifier(s): CVE-2020-24556, CVE-2020-24562
Platform(s): Windows
CVSS 3.0 Score(s): 7.8
Severity Rating(s): High

Trend Micro has released a new patch for Trend Micro OfficeScan XG SP1.  This patch resolves a hard link privilege escalation vulnerability.


Affected Version(s)

ProductAffected Version(s)PlatformLanguage(s)
OfficeScanXG SP1WindowsEnglish


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

ProductUpdated versionNotesPlatformAvailability
OfficeScanXG SP1 Patch 3 b5684ReadmeWindowsNow 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-2020-24556 and CVE-2020-24562 Hard Link Privilege Escalation Vulnerability (Windows)
CVSSv3: 7.8: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerabilities in Trend Micro OfficeScan XG SP1 on Microsoft Windows may allow an attacker to create a hard link to any file on the system, which then could be manipulated to gain a privilege escalation and code execution.

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

Please note that version 1909 (OS Build 18363.719) of Microsoft Windows 10 mitigates hard links, but previous versions are affected.

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.

Newer versions of the operating system (e.g. Windows 10) may protect against hard link privilege escalations.

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.


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-20-1093
  • ZDI-CAN-10794
Upgrade; Update
Solution Id:
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