Vulnerability Note VU#568073

Canon digital multifunction copiers FTP bounce vulnerability

Original Release date: 28 Feb 2008 | Last revised: 29 Apr 2008


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


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.


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


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

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.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
CanonAffected-06 Mar 2008
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



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
  • Date Public: 28 Feb 2008
  • Date First Published: 28 Feb 2008
  • Date Last Updated: 29 Apr 2008
  • Severity Metric: 0.72
  • Document Revision: 12


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