CVE-2022-26235: Remisol Advance Normand Message Server

CVE-2022-26235: Remisol Advance Normand Message Server

A vulnerability was discovered in the Remisol Advance v2.0.12.1 and below for the Normand Message Server. On installation, the permissions set by Remisol Advance allow non-privileged users to overwrite and/or manipulate executables and libraries that run as the elevated SYSTEM user on Windows.

To recreate the conditions for exploitation, do the following;

Step 1: Obtain low-level permission to a workstation (these workstations are usually protected with a weak password, a default vendor password or no password).
Step 2: Replace the message server service executable (MessageServer.exe or any associated library used with the service) with a malicious or PoC binary. Note: This service and its executable may be named something else in different regions, please check the services installed in Windows.
Step 3: Restart the machine or service, whichever is more accessible.
Step 4: Your binary will be started as the SYSTEM/NT Authority user.

The fix is simple: correct the permissions so that every user cannot overwrite the services and make themselves a super admin on the local Windows host.