Perspective
Perspective
Perspective 451
Perspective
RETIRED MACHINE

Perspective

Perspective - Windows Windows
Perspective - Insane Insane

4.8

MACHINE RATING

370

USER OWNS

218

SYSTEM OWNS

19/03/2022

RELEASED
Created by w1nd3x

Machine Synopsis

Perspective is an insane difficulty Windows machine that focuses on the exploitation of ASP.NET web applications and badly implemented cryptography. Initial access is obtained by reading the application `web.config` file via a Server-Side Include, which is possible due to a weak filter on file upload. Having retrieved the application `machineKey`, a new session cookie can be forged to gain administrative rights and access a restricted area, where SSRF can be exploited to access an internal encryption API which uses a weak RC4 implementation, resulting in the decryption of the `ViewStateUserKey`. Remote command execution is then achieved via deserialisation of a malicious ViewState that can be forged using the obtained application keys. Finally, a padding oracle attack on an internal staging application running with administrative privileges allows to inject OS commands in an encrypted POST parameter, resulting in the elevation of privileges.

Machine Matrix

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