World News Roundup: 12/18

<p>A step closer to a second COVID-19 vaccine. Nearing a new stimulus deal. A hack of federal agencies is worse than first thought. Correspondent Steve Kathan has the CBS World News Roundup for Friday, December 18, 2020:</p><p>See Privacy Policy at <a href="https://art19.com/privacy" rel="noopener noreferrer" target="_blank">https://art19.com/privacy</a> and California Privacy Notice at <a href="https://art19.com/privacy#do-not-sell-my-info" rel="noopener noreferrer" target="_blank">https://art19.com/privacy#do-not-sell-my-info</a>.</p>