Pro-Russia hackers have exploited shoddy security practices at multiple US water plants in recent cyberattacks that have hit a wider swathe of victims than was previously documented, according to an advisory by US federal agencies obtained by CNN. Though the attacks have not impacted drinking water, the advisory lays bare the cybersecurity challenges facing the thousands of water systems across the US, many of which are often short of cash and personnel to deal with threats. The document helps explain the plea that US national security adviser Jake Sullivan made in March to water authorities to shore up their defenses....