Don't just patch, check for p0wnage, says top natsec team Laura Dobberstein Mon 8 Mar 2021 // 04:58 UTC Share Copy The Biden administration has urged users of Microsoft's Exchange mail and messaging server to ensure they have not fallen victim to the recently-detected "Hafnium" attack on Exchange Server that Microsoft says originated in China. Microsoft revealed the attack last week and released Exchange security updates. The Biden administration’s Cybersecurity and Infrastructure Security Agency (CISA) followed up with a March 5 general advisory encouraging upgrades to on-premises Exchange environments. Another advisory on 6 March upped the ante as follows: CISA is aware of widespread domestic and international exploitation of these vulnerabilities and strongly recommends organizations run the Test-ProxyLogon.ps1 script—as soon as possible—to help determine whether their systems are compromised.