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Indiana University Security Advisory: Fuji Xerox Printing Systems (FXPS) print engine vulnerabilities
Advisory ID: 20060824_FXPS_Print_Engine_Vulnerabilities
Revisions: 08-24-2006 2350 UTC 1.0 Initial Public Release
Issues: FTP bounce attack is possible when FTP printing is enabled (CVE-2006-2112)
Embedded HTTP server allows unauthenticated access to system configuration and settings (CVE-2006-2113)
Credit/acknowledgement: CVE-2006-2112 Date of discovery: 04-11-2006 Nate Johnson, Lead Security Engineer, Indiana University Sean Krulewitch, Deputy IT Security Officer, Indiana University
CVE-2006-2113 Date of discovery: 04-11-2006 Sean Krulewitch, Deputy IT Security Officer, Indiana University
Summary: Certain FXPS print engines contain vulnerabilities that allow a remote attacker to perform FTP bounce attacks through the FTP printing interface or allow unauthenticated access to the embedded HTTP remote user interface. The first vulnerability is due to a failure to restrict the connections made by the FTP PORT command. This allows an attacker to cause the FTP server to make arbitrary connections to ports on another system, which can be used to bypass access controls and hide the the true identity of the source of the attacker's traffic. The second vulnerability is due to a failure to properly authenticate HTTP requests. Specially constructed HTTP requests allow an attacker to make unauthorized changes to system configuration and settings, and can also be used to cause a denial of service against a vulnerable print server. A successful attacker would be able to reset the administrator password but would not be capable of exposing the current password.
Mitigation/workarounds: Disabling FTP printing prevents the FTP bounce attack. Disabling the embedded web server prevents the DoS/unauthorized configuration change attack. Best practice suggests that access controls and network firewall policies be put into place to only allow connections from trusted machines and networks.
Criticality: These vulnerabilities have a combined risk of moderately critical.
Products affected: Dell 5110cn, firmware versions less than A01  Dell 3110cn, firmware versions less than A01  Dell 3010cn, firmware versions less than A01  Dell 5100cn, firmware versions less than A05  Dell 3100cn, firmware versions less than A05  Dell 3000cn, firmware versions less than A05  Other OEM products using the affected FXPS print engine
Recommended steps: Apply vendor patches and disable remote protocols that are not necessary.
Footnotes:  http://www.fxpsc.co.jp/en/  https://itso.iu.edu/20060824_FXPS_Print_Engine_Vulnerabilities  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2112  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2113  http://ftp.us.dell.com/printer/R130538.EXE  http://ftp.us.dell.com/printer/R130356.EXE  http://ftp.us.dell.com/printer/R132075.EXE  http://ftp.us.dell.com/printer/R132718.EXE  http://ftp.us.dell.com/printer/R132079.EXE  http://ftp.us.dell.com/printer/R132368.EXE
All contents are Copyright 2006 The Trustees of Indiana University. All rights reserved.
Sean Krulewitch, Deputy IT Security Officer IT Security Office, Office of the VP for Information Technology Indiana University For PGP Key or S/MIME cert: https://www.itso.iu.edu/Sean_Krulewitch
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