Security News > 2021 > August > Microsoft Exchange servers are getting hacked via ProxyShell exploits

Threat actors are actively exploiting Microsoft Exchange servers using the ProxyShell vulnerability to install backdoors for later access.

ProxyShell is the name of an attack that uses three chained Microsoft Exchange vulnerabilities to perform unauthenticated, remote code execution.

Last week, Orange Tsai gave a Black Hat talk about recent Microsoft Exchange vulnerabilities he discovered when targeting the Microsoft Exchange Client Access Service attack surface.

Security researcher Kevin Beaumont began seeing threat actors scan for Microsoft Exchange servers vulnerable to ProxyShell.

Today, Beaumont and NCC Group's vulnerability researcher Rich Warren disclosed that threat actors have exploited their Microsoft Exchange honeypots using the ProxyShell vulnerability.

From a sample shared by Warren with BleepingComputer, the webshells consist of a simple authentication-protected script that the threat actors can use to upload files to the compromised Microsoft Exchange server.

News URL

https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-servers-are-getting-hacked-via-proxyshell-exploits/