Severe local 0-Day escalation exploit found in Steam Client Services

Gamers beware! Ars Technica:

A security flaw in Steam’s client service allows easy execution of arbitrary code as LOCALSYSTEM.

Earlier today, disgruntled security researcher Vasily Kravets released a zero-day vulnerability in the Windows version of the ubiquitous gaming service Steam.

Source: Severe local 0-Day escalation exploit found in Steam Client Services