Summary
A new vulnerability named ProxyToken has been disclosed by the Zero-Day Initiative Blog. Like ProxyShell, this vulnerability targets Microsoft Exchange servers.
Overview
A new vulnerability in Microsoft Exchange named ProxyToken has been observed by researchers and disclosed to the Zero-Day Initiative program. The vulnerability allows attackers to skip authentication and change an Exchange server's backend configuration. According to Le Xuan Tuyen, the original researcher credited for discovering th
On Unix/Linux users with a uid=0 are root. This means any security checks are bypassed for them.
An adversary might go ahead and create a new account, or set an existing account’s user identifier (uid) or group identifier to zero.
A simple way to do this is to update /etc/passwd of an account, or use usermod -u 0 -o mallory.
Let’s create a new user named mallory:
wuzzi@saturn:/$ sudo adduser mallory [.