[NEWS] Ascend's Undocumented Protocol Allows Unauthorized Modifications

From: support@securiteam.com
Date: 07/28/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sun, 28 Jul 2002 08:14:22 +0200 (CEST)

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  Ascend's Undocumented Protocol Allows Unauthorized Modifications
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SUMMARY

The product line formerly known under the name of "Ascend" running the
TAOS Operating System provides an easy to use and support interface. This
interface includes an undocumented protocol that provides an easy method
to identify and query the devices (similar to the Cisco CDP problem but
remote).

DETAILS

Vulnerable systems:
 * Pipline, MAX, DSL-Terminator. (Formerly known under Ascend Router
product line

Immune systems:
 * MAX TNT

By sending a crafted UDP packet to the devices UDP discard port (9), the
device will answer with a packet containing valuable information such as
the host's name, MAC, IP address of the Ethernet Interface, Serial number,
device type and installed features. By sending a packet with the SNMP
WRITE community, a remote attacker can change the devices IP address,
netmask or name.

Vendor status:
06/28/02 Reply to inquiry regarding "who to notify"
06/29/02 Initial Notification *Note-Initial notification by phenoelit
includes a cc to cert@cert.org by default
06/29/02 Human response acknowledges the receipt.
07/06/02 Weekly Follow-up by central POC at Lucent
07/08/02 Additional technical discussions
07/19/02 Notification of intent to post publicly in approximately 7 days.

Example:
linux# irpas/dfkaa 192.168.1.11
DFKAA - Devices Formerly Known as Ascend FX <fx@phenoelit.de> -
http://www.phenoelit.de/
$Revision: 1.22 $ - IRPAS Build XL (c) 2001++

>>ascend<<
        [Probe response]
        ADP version: 2
        *MAC addr: 00:C0:7B:89:DD:86
        IP addr: 192.168.1.11/255.255.255.0
        *Serial number: 9990826374
        Device type: Ascend Pipeline 75
        Features: 0004 0030 0140 0000
*Device Serial number and MAC have been changed.

ADDITIONAL INFORMATION

The information has been provided by <mailto:fx@phenoelit.de> FX and
<mailto:kim0@phenoelit.de> kim0.

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