Original Bulletin Release Date: August 28, 2020
CVE Identifier(s): CVE-2020-24556, CVE-2020-24562
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.
Trend Micro has released the following solution to address the issue:
|OfficeScan||XG SP1 Patch 3 b5684||Readme||Windows||Now 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.
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.
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:
- @Kharosx0 working with Trend Micro's Zero Day Initiative
- Tr\xe1\xba\xa7n V\xc4\x83n Khang - khangkito - Infinity Team of VinCSS working with Trend Micro's Zero Day Initiative