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Lexmark Security Advisory: Information Disclosure via Finger Service (CVE-2019-10059)

Document ID:TE923

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Lexmark Security Advisory:

 Revision:  1.0
 Last update:     10 May 2019
 Public Release Date:  20 May 2019

 

 

Summary

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.

 

 

References

CVE:   CVE-2019-10059

 

 

Details
 

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)
Impact Subscore: 1.4  
Exploitability Subscore: 3.9  

  

CVSSv3 scores are calculated in accordance with CVSS version 3.0 (https://www.first.org/cvss/user-guide)

 

 

Impact
 

Successful exploitation of this vulnerability can lead to the disclosure of diagnostic information from the device.

 

 

Affected Products


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.

 

 

Workarounds


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.

 

  

Distribution


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 History

 

Revision Date Reason
1.0 20 - May - 2019 Initial Public Release

 

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