ESET was made aware of two vulnerabilities in installers of its products for Windows that allow a user logged into the system to perform a privilege escalation attack by misusing the Repair and Uninstall options. ESET released an automatic module update to cover these vulnerabilities in already installed eligible products and released fixed product installers.
CVE-2021-37851 allows a user who is logged into the system to perform a privilege escalation attack by exploiting the repair feature of the installer to run malicious code with higher privileges.
The CVSS v3 base score for CVE-2021-37851 is 7.3 with the following vector AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CVE-2022-27167 affects the Repair and Uninstall options and exploiting it may lead to arbitrary file deletion.
The CVSS v3 base score for CVE-2022-27167 is 7.1 with the following vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
To the best of our knowledge, there are no existing exploits that take advantage of these vulnerabilities in the wild.
ESET released an update of the Antivirus and antispyware scanner module to cover these vulnerabilities in already installed products, which was distributed automatically. ESET also released fixed builds of its products for Windows.
Since installed products receive the patch via the Antivirus and antispyware scanner module update, users with ESET products installed do not need to take any action regarding these vulnerabilities. For new installations, we recommend using the latest installers downloaded from the ESET website or the ESET repository.
The issues are resolved in the following modules and builds:
Note: Users of ESET Server Security for Microsoft Azure are advised to use ESET Server Security for Microsoft Windows Server.
ESET values the principles of coordinated disclosure within the security industry and would like to express our thanks to Brecht Snijders for reporting CVE-2022-27167.
Version 1.0 (May 9, 2022): Initial version of this document