Lexmark Security Advisory:
| Revision:|| 1.0|
| Last update: || 10 May 2019|
| Public Release Date:|| 20 May 2019|
Most older Lexmark devices have the “finger” service enabled by default. This service allows unauthenticated access to internal diagnostic information of the device. Lexmark recommends that the finger service be disabled by blocking access to TCP port 79 via the “TCP/IP Port Access” configuration menu.
The finger service (TCP port 79) is a legacy method for determining the state of a device. The finger service also allows unauthenticated access to diagnostic information from the device. Newer Lexmark products disable "Finger" by default, but on older devices the default is to enable the service. Lexmark recommends that the finger service be disabled by blocking access to TCP port 79 via the “TCP/IP Port Access” configuration menu.
A firmware update is available which changes the default state of the finger service to “disabled” when the device is reset to factory defaults.
|CVSSv3 Base Score||5.3||(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)|
CVSSv3 scores are calculated in accordance with CVSS version 3.0 (https://www.first.org/cvss/user-guide)
Successful exploitation of this vulnerability can lead to the disclosure of diagnostic information from the device.
To determine a devices firmware level, select the “Settings”->“Reports”->”Menu Setting Page” menu item from the operator panel. If the firmware level listed under “Device Information” matches any level under “Affected Releases”, then upgrade to a “Fixed Release”.
|Lexmark Models||Affected Releases||Fixed Releases|
|CS31x||LW71.VYL.P233 and previous||LW71.VYL.P234 and later|
|CS41x||LW71.VY2.P233 and previous||LW71.VY2.P234 and later|
|CS51x||LW71.VY4.P233 and previous||LW71.VY4.P234 and later|
|CX310||LW71.GM2.P233 and previous||LW71.GM2.P234 and later|
|CX410 & XC2130||LW71.GM4.P233 and previous||LW71.GM4.P234 and later|
|CX510 & XC2132||LW71.GM7.P233 and previous||LW71.GM7.P234 and later|
|MS310, MS312, MS317||LW71.PRL.P233 and previous||LW71.PRL.P234 and later|
|MS410, M1140||LW71.PRL.P233 and previous||LW71.PRL.P234 and later|
|MS315, MS415, MS417||LW71.TL2.P233 and previous||LW71.TL2.P234 and later|
|MS51x, MS610dn, MS617||LW71.PR2.P233 and previous||LW71.PR2.P234 and later|
|M1145, M3150dn||LW71.PR2.P233 and previous||LW71.PR2.P234 and later|
|MS610de, M3150||LW71.PR4.P233 and previous||LW71.PR4.P234 and later|
|MS71x, M5163dn||LW71.DN2.P233 and previous||LW71.DN2.P234 and later|
|MS810, MS811, MS812, MS817, MS818||LW71.DN2.P233 and previous||LW71.DN2.P234 and later|
|MS810de, M5155, M5163||LW71.DN4.P233 and previous||LW71.DN4.P234 and later|
|MS812de, M5170||LW71.DN7.P233 and previous||LW71.DN7.P234 and later|
|MS91x||LW71.SA.P233 and previous||LW71.SA.P234 and later|
|MX31x, XM1135||LW71.SB2.P233 and previous||LW71.SB2.P234 and later|
|MX410, MX510 & MX511||LW71.SB4.P233 and previous||LW71.SB4.P234 and later|
|XM1140, XM1145||LW71.SB4.P233 and previous||LW71.SB4.P234 and later|
|MX610 & MX611||LW71.SB7.P233 and previous||LW71.SB7.P234 and later|
|XM3150||LW71.SB7.P233 and previous||LW71.SB7.P234 and later|
|MX71x, MX81x||LW71.TU.P233 and previous||LW71.TU.P234 and later|
|XM51xx & XM71xx||LW71.TU.P233 and previous||LW71.TU.P234 and later|
|MX91x & XM91x||LW71.MG.P233 and previous||LW71.MG.P234 and later|
|MX6500e||LW71.JD.P233 and previous||LW71.JD.P234 and later|
|C746||LHS60.CM2.P705 and previous||LHS60.CM2.P706 and later|
|C748, CS748||LHS60.CM4.P705 and previous||LHS60.CM4.P706 and later|
|C792, CS796||LHS60.HC.P705 and previous||LHS60.HC.P706 and later|
|C925||LHS60.HV.P705 and previous||LHS60.HV.P706 and later|
|C950||LHS60.TP.P705 and previous||LHS60.TP.P706 and later|
|X548 & XS548||LHS60.VK.P705 and previous||LHS60.VK.P706 and later|
|X74x & XS748||LHS60.NY.P705 and previous||LHS60.NY.P706 and later|
|X792 & XS79x||LHS60.MR.P705 and previous||LHS60.MR.P706 and later|
|X925 & XS925||LHS60.HK.P705 and previous||LHS60.HK.P706 and later|
|X95x & XS95x||LHS60.TQ.P705 and previous||LHS60.TQ.P706 and later|
|6500e||LHS60.JR.P705 and previous||LHS60.JR.P706 and later|
|C734||LR.SK.P815 and previous||LR.SK.P816 and later|
|C736||LR.SKE.P815 and previous||LR.SKE.P816 and later|
|E46x||LR.LBH.P815 and previous||LR.JBH.P816 and later|
|T65x||LR.JP.P815 and previous||LR.JP.P816 and later|
|X46x||LR.BS.P815 and previous||LR.BS.P816 and later|
|X65x||LR.MN.P815 and previous||LR.MN.P816 and later|
|X73x||LR.FL.P815 and previous||LR.FL.P816 and later|
|W850||LP.JB.P815 and previous||LP.JB.P816 and later|
|X86x||LP.SP.P815 and previous||LP.SP.P816 and later|
Obtained 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.
Lexmark recommends that the finger service be disabled by blocking access to TCP port 79 via the “TCP/IP Port Access” configuration menu.
Lexmark suggests a firmware update if wish your device to disable the finger service by default when the device is reset to factory defaults.
Exploitation and Public Announcements
Lexmark is not aware of any malicious use against Lexmark products of the vulnerability described in this advisory.
Lexmark would like to thank Daniel Romero and Mario Rivas of NCC group 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.
|1.0||20 - May - 2019||Initial Public Release|
LEGACY ID: TE923