Advisory Details

November 30th, 2021

Trend Micro Worry-Free Business Security Unnecessary Privileges Local Privilege Escalation Vulnerability

ZDI-21-1366
ZDI-CAN-14221

CVE ID CVE-2021-44021
CVSS SCORE 7.0, (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Trend Micro
AFFECTED PRODUCTS Worry-Free Business Security
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Trend Micro Worry-Free Business Security. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the Security Server. The issue results from allowing an untrusted process to impersonate the client of a pipe. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS Trend Micro has issued an update to correct this vulnerability. More details can be found at:
https://success.trendmicro.com/solution/000289230
DISCLOSURE TIMELINE
  • 2021-06-25 - Vulnerability reported to vendor
  • 2021-11-30 - Coordinated public release of advisory
CREDIT Michael DePlante (@izobashi) of Trend Micro's Zero Day Initiative
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