3/17/2023 0 Comments Secure pipes files![]() ![]() To date,the most common way to exploit named pipes to gain privileges on a system has been to abuse the impersonation token granted to the named pipe server to act on behalf of a connected client. ![]() For example, the Service Control Manager (SCM) of Windows was discovered to be vulnerable to race conditions related to Named Pipes in 2000, more recently, a predictable named pipe used by Google Chrome could be exploited to help escape from the browser sandbox. Named pipes were introduced with NT and have been known to be vulnerable to a number of attacks over the years, especially once full support was adopted with Windows 2000. It’s also very easy to implement in a language such as C#, with a basic read all of the named pipes directory being as simple of named pipes There are many easy ways to read the contents of the local NPFS: Powershell, Microsoft SysInternals Process Explorer and Pipelist as well as numerous third party tools. The named pipe directory is located at: \\\pipe\ So named pipes are actually just files on a hard drive which persist until there are no remaining handles to the file, at which point the file is deleted by Windows. The NPFS is a hidden partition which functions just like any other files are written, read and deleted using the same mechanisms as a standard Windows file system. ![]() Named pipes on Windows use what is known as the Named Pipe File System (NPFS). On Windows, named pipes operate in a server-client model and can make use of the Windows Universal Naming Convention (UNC) for both local and remote connections. Named pipes are one of the many forms of IPC in use today and are extensively used on the Windows platform as a means to exchange data between running processes in a semi-persistent manner. Processes often talk to each other and many software packages contain multiple components which need to exchange data to run properly. Inter Process Communication (IPC) is an ubiquitous part of modern computing. ![]()
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