Canon digital multifunction copiers FTP bounce vulnerability

Overview

Some models of Canon digital multifunction copiers are vulnerable to the FTP bounce attack.

Description

From the_ Problems With The FTP PORT Command _document:

The FTP Bounce Attack

To conform with the FTP protocol, the PORT command has the originating machine specify an arbitrary destination machine and port for the data connection. However, this behavior also means that an attacker can open a connection to a port of the attacker’s choosing on a machine that may not be the originating client.

Some Canon digital multifunction printers contain an FTP server that is vulnerable to the FTP bounce attack.

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Impact

A remote, unauthenticated attacker may be able to conduct port scans or send arbitrary (TCP) traffic to other hosts.

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Solution

We are currently unaware of a practical solution to this problem.

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The following workarounds may mitigate this vulnerability:

Disable the affected FTP server
Administrators and users should either turn off the vulnerable FTP server or disable anonymous access. For more information, see the “Steps to take to clear vulnerability” section of the Canon Web Advisory: Digital multifunction printer vulnerability.

Use host-based firewalls
Administrators and users can use host-based firewalls to prevent affected printers and other devices from creating connections to arbitrary TCP ports.

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Vendor Information

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Updated: March 06, 2008

Status

Affected

Vendor Statement

See the following Canon Web sites for more information:

Canon U.S.A.: <http://www.usa.canon.com/html/security/pdf/CVA-001.pdf&gt;
Canon Europe: <http://www.canon-europe.com/For_work/Canon_Europe_CBS_Web_Advisory_Digital_Multifunction_Printers.asp&gt;

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

We are not aware of an update that addresses this issue.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23568073 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.usa.canon.com/html/security/pdf/CVA-001.pdf&gt;
• <http://www.canon-europe.com/For_work/Canon_Europe_CBS_Web_Advisory_Digital_Multifunction_Printers.asp&gt;
• <http://www.cert.org/tech_tips/ftp_port_attacks.html#3.2&gt;
• <http://nmap.org/hobbit.ftpbounce.txt&gt;

Acknowledgements

Thanks to Canon for information that was used in this report. Canon credits Nate Johnson and the Indiana University for reporting this vulnerability.

This document was written by Ryan Giobbi.

Other Information

CVE IDs:	CVE-2008-0303
Severity Metric:	0.72 Date Public: