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Lexmark Security Advisory: SNMP Denial of Service Vulnerability (CVE-2019-9931)

Document ID:TE919

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Lexmark Security Advisory:

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

 

Summary

Some Lexmark printers contain a denial of service vulnerability in their SNMP service. This vulnerability can be exploited to crash the device. 

 

References

CVE:   CVE-2019-9931

 

Details

A specially crafted request to the SNMP service will cause a vulnerable device to crash. If the “General Settings”->Error Recovery” setting is set to “Auto Reboot” (the default) then the device will automatically reboot until the “Max Auto Reboots” limit is reached.

CVSSv3 Base Score 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Impact Subscore: 3.6  
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 a denial of service on the affected device by causing it to crash.

 

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”.

 

 

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.

 

Workarounds

Disabling the SNMP service on the device or disabling access to TCP port 161 blocks the ability to exploit this vulnerability.

 

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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