An issue was discovered in Kaseya VSA RMM through 9.5.0.22....

Vulnerability Description

An issue was discovered in Kaseya VSA RMM through 9.5.0.22. When using the default configuration, the LAN Cache feature creates a local account FSAdminxxxxxxxxx (e.g., FSAdmin123456789) on the server that hosts the LAN Cache and all clients that are assigned to a LAN Cache. This account is placed into the local Administrators group of all clients assigned to the LAN Cache. When the assigned client is a Domain Controller, the FSAdminxxxxxxxxx account is created as a domain account and automatically added as a member of the domain BUILTIN\Administrators group. Using the well known Pass-the-Hash techniques, an attacker can use the same FSAdminxxxxxxxxx hash from any LAN Cache client and pass this to a Domain Controller, providing administrative rights to the attacker on any Domain Controller. (Local account Pass-the-Hash mitigations do not protect domain accounts.)

References

• https://www.kaseya.com/products/vsa/
• http://community.kaseya.com/xsp/f/355.aspx
• https://lockstepgroup.com/blog/abusing-the-kaseya-lan-cache-fsadmin/
• https://lockstepgroup.com/blog/cve-2019-14510-abusing-the-kaseya-lan-cache-fsadmin-red-team-edition/
• http://community.kaseya.com/xsp/f/355/t/24675.aspx