# Discovery by: mmg
# Discovery Date: 2023-01-23
# Vendor Homepage: https://www.zabb # Exploit Title: Zabbix agents - Insecure Permissions on non-default installation directory location
# Discovery by: mmg
# Discovery Date: 2023-01-23
# Vendor Homepage: https://www.zabbix.com/download_agents
# Software Link Zabbix agent : https://cdn.zabbix.com/zabbix/binaries/stable/6.2/6.2.7/zabbix_agent-6.2.7-windows-amd64-openssl.msi
# Software Link Zabbix agent 2 : https://cdn.zabbix.com/zabbix/binaries/stable/6.2/6.2.7/zabbix_agent2-6.2.7-windows-amd64-openssl.msi
# Tested Version: Zabbix agent and Zabbix agent 2 (v6.2.6, v6.2.7 and older versions)
# Vulnerability Type: Local Privilege Escalation
# Tested on OS: Windows 10 Pro Version 22H2 (OS Build 19045.2486) x64 version
# CVSSv3 Vectors : https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
# CVE N/A
# Step to discover:
Go to Start and type powershell.
Enter the following command and press Enter:
Get-WmiObject win32_service | ?{ $_.Name -like '*zabbix*' -and $_.Pathname -notlike "*C:Program Files*"}| select Name,PathName
# Example of a vulnerable installation
Name PathName
---- --------
Zabbix Agent "C:Softwareabbix Agentzabbix_agentd.exe" --config "C:Softwareabbix Agentzabbix_agentd.conf"
Zabbix Agent 2 "D:softwareabbix Agent 2zabbix_agent2.exe" -c "D:softwareabbix Agent 2zabbix_agent2.conf" -f=false
# Exploit:
A vulnerability was found in Zabbix Agents on non-default installation directory location.
The Zabbix Agent executables have incorrect permissions, allowing a local unprivileged user to replace it
with a malicious file that will be executed with "LocalSystem" privileges which will result in complete
compromise of Confidentiality, Integrity and Availability.
# Timeline
Jan 23, 2023 - Reported to Zabbix
Feb 1, 2023 - Zabbix does not consider this a vulnerability
Feb 6, 2023 - Requested official approval to disclose it
Feb 8, 2023 - Zabbix agrees with public disclosure
Feb 13, 2023 - Public disclosure