Attackers are currently exploiting two unpatched vulnerabilities to remotely compromise on-premises Microsoft Exchange servers. Microsoft confirmed the flaws late last week and published mitigation advice until a complete patch can be developed, but according to reports, the proposed mitigation can be easily bypassed.
The new vulnerabilities were discovered in early August by a Vietnamese security company called GTSC while performing security monitoring and incident response for a customer whose servers were attacked. Initially, the GTSC researchers thought they might be dealing with a ProxyShell exploit based on the malicious requests seen in the server logs which looked similar. ProxyShell is an attack that chains three Exchange vulnerabilities and was patched last year.
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