For instance, when the times and dates for daylight savings time change, only the windows calls get updated automatically. If you want your application to upgrade smoothly over the years, you have to use either the DLL calls or the windows system calls and avoid the statically linked C libraries. The practical reasons that I have been forced to use DLLs are: The Microsoft official answer is at: Extension DLLs While officially Microsoft supports static linking, in practice, it is necessary to use DLLs in many situations. He explained, providing two command line examples, how a script or malware could remotely transfer a malicious DLL into that temporary folder. The attack reads on the clunky side, but Kanthak told ZDNet in an email that the attack could be easily weaponized. When that updater runs, it uses another executable file to run the update, which is vulnerable to the hijacking. Once installed, Skype uses its own built-in updater to keep the software up to date. The bug works because the malicious DLL is found first when the app searches for the DLL it needs. An attacker can download a malicious DLL into a user-accessible temporary folder and rename it to an existing DLL that can be modified by an unprivileged user, like UXTheme.dll. From the report: Security researcher Stefan Kanthak found that the Skype update installer could be exploited with a DLL hijacking technique, which allows an attacker to trick an application into drawing malicious code instead of the correct library. ZDNet reports of a security flaw in Skype's updater process that " can allow an attacker to gain system-level privileges to a vulnerable computer." If the bug is exploited, it "can escalate a local unprivileged user to the full 'system' level rights - granting them access to every corner of the operating system." What's worse is that Microsoft, which owns Skype, won't fix the flaw because it would require the updater to go through "a large code revision." Instead, Microsoft is putting all its resources on building an altogether new client.
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