tradesopk.blogg.se - Como se usa process monitor sysinternals

If a program tries to load a DLL that doesn’t exist (which isn’t common nowadays as far as I’m aware), it will eventually look for it in this vulnerable directory.

Case #1: at least one of the directories listed in %PATH% is writable.

Windows directories (e.g.: C:\Windows\System32\) are safe by default so this leaves us with only two opportunities for DLL hijacking. Here is a diagram showing the default DLL search order in Windows. This left the door open for DLL hijacking. Though, there was still a hole in the resulting ACL: users could still create files and directories. It seems that sysadmins were aware of this potential security issue and removed all the permissions allowing a user to modify the files. This makes a big difference because the ACL inherited from the partition’s root is more permissive and would allow any user to modify its content. However, in this case, the sysadmins chose to install it in C:\Zabbix Agent\. I really want to emphasize that it’s not a vulnerability related to a specific product but rather a vulnerability induced by an insecure and non-default installation of it.īy default, the Zabbix Agent is installed in C:\Program Files\Zabbix Agent\, which is a secure location because the inherited ACL would allow a standard user to only read and execute files from there. The third-party service in question here was Zabbix Agent but it could have been something else.

A third-party application is installed in a folder at the root of the C:\ drive and runs as a service with NT AUTHORITY\SYSTEM privileges.

The machine is running an up-to-date version of Windows 10 (圆4).

I simply set up a Windows 10 virtual machine to replecate the vulnerable environment: I lack imagination so I will take a real-life example I encountered during a penetration test. Here, I’d like to discuss one of its variants - DLL Proxying - and provide a step-by-step guide for easily crafting a custom DLL wrapper in the context of a privilege escalation.

DLL Hijacking is the first Windows privilege escalation technique I worked on as a junior pentester, with the IKEEXT service on Windows 7 (or Windows Server 2008 R2).