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Know Your Breach: Microsoft Exchange
Mar 12, 2021 11:04:14 AM
The target: Microsoft’s email server software, Microsoft Exchange.
The take: The networks of over 30,000 organizations, consisting of hundreds of thousand of on-premises servers. Threat actors have moved aggressively to exfiltrate personally identifiable information, highly sensitive company and client data, banking details, financial data, and more.
The attack vector: Four security holes in Exchange Server versions 2013 to 2019 were exploited in tandem to grant attackers full access to an array of email severs. More critically, in every instance where the breach was discovered, the intruders had installed a backdoor, which continues to allow remote access to affected servers even after the set of four vulnerabilities have been patched.
While zero-day exploits will unavoidably cause challenges for vendors and their clients, we underscore the critical nature of threat monitoring, timely patching, enacting defense-in-depth measures to mitigate the failure of any single layer of security controls. Approaching security incidents and overall cybersecurity with a “when not if” mindset can materially reduce the impact of incidents such as these.
