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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.
Code injection is a computer security exploit where a program fails to correctly process external data, such as user input, causing it to interpret the data as executable commands. An attacker using this method "injects" code into the program while it is running.
winspy Three ways to inject code into another process. HookTool SDK (ACF SDK) Provides a comprehensive overview on API hooking and code injection. A commercial product available too. madCodeHook is a commercial x86 and x64 API hooking and DLL injection library for C++ and Delphi.
Consequently, a process cannot interact with another process that has a higher IL. So a process cannot perform functions such as inject a DLL into a higher IL process by using the CreateRemoteThread() function [4] of the Windows API or send data to a different process by using the WriteProcessMemory() function. [5]
Another method is relative path DLL hijacking, which moves the vulnerable program to a location together with the malicious DLL. The DLL is loaded because the application's directory is searched early. According to CrowdStrike, this method is the most common. [7] DLL sideloading delivers both the legitimate program and malicious library. It may ...
For example, a process running under a guest account can in this way corrupt another process running under a privileged account. This is an important reason to avoid the use of shared sections in DLLs. If a DLL is compressed by certain executable packers (e.g. UPX), all of its code sections are marked as read and write, and will be unshared ...
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On its own, an arbitrary code execution exploit will give the attacker the same privileges as the target process that is vulnerable. [11] For example, if exploiting a flaw in a web browser, an attacker could act as the user, performing actions such as modifying personal computer files or accessing banking information, but would not be able to perform system-level actions (unless the user in ...