![]() This DLL has a payload which will execute once the file is loaded. Note how the user has permissions to add the poisoned dll to the installation directory. Then, as this new user, we downloaded the provided CRYPTBASE.dll. To fully demonstrate the implications of this vulnerability, we created a new unprivileged user. Note the improper permissions, BUILTIN\Users Allow *, on the installation directory, which are inherited from the drive root: This directory can either be created through the installer GUI, or through the command line - for example: mkdir C:\tools.Īfter completing the installation, we found the service was registered as expected. We used the default settings at every step, except for the installation directory which we changed to C:\tools to demonstrate the permission misconfiguration. Following the installation directions, we install the self-hosted server. From there, we were emailed instructions and a license key. #OCROPUS WINDOWS INSTALLER LICENSE KEY#In order to investigate field reports of potential permissions issues with the service, we signed up for the free license key here. The following versions are affected by this vulnerability: This is a writeup for CVE-2021-26556, a local privilege escalation in Octopus Server. This service runs as Local System and is a very impactful target for local privilege escalation exploits. ![]() Octopus Server allows users to self-host this platform, and is installed as a service on the host. Octopus Deploy is a popular DevOps automation platform that enables teams to more efficiently manage configuration, API keys, and permissions. ![]()
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