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MICROSOFT IIS 5 EXPLOIT SOFTWARE
The ACSC has also observed active targeting of organisations running other vulnerable software components, such as Telerik, that can also provide access to the required key material to perform decryption. The ACSC has observed active targeting of organisations that have been previously compromised, implying that configuration files and associated keys may have been exfiltrated while the actor was present on systems running IIS. NET on IIS, the contents of this parameter are protected by Message Authentication Code (MAC) validation and an actor must obtain the IIS server Machine Key to exploit this vulnerability. The vulnerability exploits the service’s VIEWSTATE parameter to allow for remote code execution by unauthorised users.įor actors to successfully exploit this vulnerability, they need to craft a VIEWSTATE parameter with malicious content. The ACSC is aware that sophisticated actors are actively exploiting a deserialisation vulnerability existing in all versions of Microsoft’s Internet Information Services (IIS) using the. The Australian Signals Directorate’s Australian Cyber Security Centre (ACSC) notes that actors have attempted to use this exploit against a number of federal and state government agencies.