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In computer programming, DLL injection is a technique used for running code within the address space of another process by forcing it to load a dynamic-link library. [1] DLL injection is often used by external programs to influence the behavior of another program in a way its authors did not anticipate or intend.
DLL hell was a very common phenomenon on pre-Windows NT versions of Microsoft operating systems, the primary cause being that the 16-bit operating systems did not restrict processes to their own memory space, thereby not allowing them to load their own version of a shared module that they were compatible with.
Installing malware or executing malevolent code on a server by injecting server scripting code (such as PHP). Privilege escalation to either superuser permissions on UNIX by exploiting shell injection vulnerabilities in a binary file or to Local System privileges on Microsoft Windows by exploiting a service within Windows.
It is the standard format for executables on Windows NT-based systems, including files such as .exe, .dll, .sys (for system drivers), and .mui. At its core, the PE format is a structured data container that gives the Windows operating system loader eveything it needs to properly manage the executable code it contains.
The code is compiled into a DLL file then loaded into the target process using any method of DLL injection. Using a backup of the original function one might then restore the first six bytes again so the call will not be interrupted. In this example the win32 API function MessageBoxW is hooked. [2]
A DLL file often has file extension.dll, but can have any file extension. Developers can choose to use a file extension that describes the content of the file such as .ocx for ActiveX controls and .drv for a legacy (16-bit) device driver. A DLL that contains only resources can be called a resource DLL.
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Address space layout randomization (ASLR) is a computer security technique involved in preventing exploitation of memory corruption vulnerabilities. [1] In order to prevent an attacker from reliably redirecting code execution to, for example, a particular exploited function in memory, ASLR randomly arranges the address space positions of key data areas of a process, including the base of the ...