Lexmark Security Advisory
Last update: 22 Jan 2014
Public Release Date: 31 Jan 2014
Password reset vulnerability. Some older Lexmark Printers and MarkNet devices will fail to authenticate a specially crafted password reset request. This vulnerability can be exploited to bypass authentication configured on the device.
Selected Lexmark Laser printer products and MarkNet devices; for specific details see “Software Versions & Fixes”
Some older Lexmark Printers and MarkNet devices provide a simple “Password Protect” feature to authorize access to device menus. On vulnerable devices it is possible to craft an HTML request to change these passwords that will bypass authentication, allowing the passwords to be changed or removed.
Successful exploitation of this vulnerability can lead to unauthorized disclosure and/or modification of printer settings.
Vulnerability Scoring Details
CVSS Base Score: 9.0
Impact Subscore: 8.5
Exploitability Subscore: 10
|Access Vector: Network
|Access Complexity: Low
CVSS scores are calculated in accordance with CVSS version 2.0 (http://www.first.org/cvss/cvss-guide.html)
Software Versions and Fixes
Updated software that removes the vulnerability described in this advisory is available for the following devices:
|Lexmark Models||Affected Releases||Fixed Releases|
||LC.BR.P141 and previous
||LC.BR.P142 and later|
||LC4.BE.P487 and previous
|X644 & X646
||LC2.MC.P373 and previous
||LC2.MC.P374 and later|
||LC2.MB.P318 and previous
||LS.HA.P252 and previous
||LS.ST.P343 and previous
||LS.ST.P344 and later|
||LC2.TI.P325 and previous
||LC.JO.P091 and previous
||LS.TA.P152 and previous
||LC.IO.P187 and previous
||LC2.IO.P335 and previous
||LC.CM.P052 and previous
||LC2.TR.P291 and previous
||LS.SW.P069 and previous
||LS.FA.P150 and previous
||LCL.CU.P114 and previous
||LC.MD.P119 and previous
||GO.GO.N206 and previous
||LC.CO.N309 and previous
||LM.SZ.P124 and previous||Contact Lexmark|
||LE.PH.P129 and previous||Contact Lexmark|
|E250||LE.PM.P126 and previous||Contact Lexmark|
Disabling the HTTP service (Embedded Web Server) on the device blocks the ability to exploit this vulnerability.
If the HTTP service must be left enabled, the problem can be mitigated by restricting the network devices that are permitted to communicate with the device. This can be accomplished by utilizing either the “Restricted Server List” feature, or via IPsec configuration on devices that support these features. Restricting the number of devices that can communicate with the printer limits the devices that can attempt to exploit the vulnerability.
Obtaining Updated Software
To obtain firmware that resolves this issue or if you have special code, please contact Lexmark’s Technical Support Center at http://support.lexmark.com to find your local support center.
Exploitation and Public Announcements
Lexmark is not aware of any malicious use of the vulnerability described in this advisory.
Lexmark would like to thank Jeff Popio and the CERT Coordination Center for bringing this issue to our attention.
Status of this Notice:
This document is provided on an "as is" basis and is provided without any express or implied guarantee or warranty whatsoever, including but not limited to the warranties of merchantability and fitness for a particular use or purpose. Lexmark reserves the right to change or update this document at any time.
This advisory is posted on Lexmark’s web site at http://support.lexmark.com/alerts
Future updates to this document will be posted on Lexmark’s web site at the same location.
Revision Date Reason
1.0 31-Jan-2014 Initial Public Release