No Patch for New PhantomRPC Privilege Escalation Technique in Windows
Summary
A new privilege escalation technique in Windows, dubbed PhantomRPC, utilizes a fake RPC server to impersonate target services and elevate privileges to System. This method does not currently have a patch available from Microsoft.
IFF Assessment
This is bad news for defenders as it introduces a new, unpatched method for attackers to gain high-level privileges on Windows systems.
Severity
This technique allows for local privilege escalation to SYSTEM, which is a high-impact outcome. The exploitability is likely moderate to high due to the use of RPC, a common protocol, and the requirement for an attacker to already have some level of access to the target system.
Defender Context
Defenders should be aware of the PhantomRPC technique and its potential to grant attackers SYSTEM-level privileges. Monitoring for unusual RPC activity and ensuring endpoint security solutions are up-to-date are crucial steps to mitigate this risk.