CVE-2022-26237: Remisol Advance - Normand ViewerService
Oct 1st, 2022 (edited)
- CVE-2022-26237: Remisol Advance - Normand ViewerService
- A vulnerability was discovered in the Remisol Advance v18.104.22.168 and below for the Normand ViewerService. 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 (ViewerService.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.
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