ESB-2018.0680 - [Appliance] Cisco 550X Series Stackable Managed Switches: Denial of service - Existing account - 2018-03-08


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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0680
        Cisco 550X Series Stackable Managed Switches SNMP Denial of
                           Service Vulnerability
                               8 March 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco 550X Series Stackable Managed Switches
Publisher:         Cisco Systems
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0209  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180307-550x

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Cisco Security Advisory

Cisco 550X Series Stackable Managed Switches SNMP Denial of Service 
Vulnerability

Medium

Advisory ID:
cisco-sa-20180307-550x

First Published:
2018 March 7 16:00 GMT

Version 1.0:
Final

Workarounds:
No workarounds available

Cisco Bug IDs:
CSCvg22135
CVE-2018-0209
CWE-119

CVSS Score:
Base 6.8
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2018-0209
CWE-119

Summary

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem
communication channel through the Cisco 550X Series Stackable Managed Switches
could allow an authenticated, remote attacker to cause the device to reload
unexpectedly, causing a denial of service (DoS) condition. The device nay need
to be manually reloaded to recover.
The vulnerability is due to lack of proper input throttling of ingress SNMP
traffic over an internal interface. An attacker could exploit this
vulnerability by sending a crafted, heavy stream of SNMP traffic to the
targeted device. An exploit could allow the attacker to cause the device to
reload unexpectedly, causing a DoS condition.
There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180307-550x

Affected Products

Vulnerable Products

This vulnerability affects Cisco 550X Series Stackable Managed Switches. For
information about affected software releases, consult the Cisco bug ID(s) at
the top of this advisory.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this
vulnerability.

Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

For information about fixed software releases, consult the Cisco bug ID(s) at
the top of this advisory.
When considering software upgrades, customers are advised to regularly consult
the advisories for Cisco products, which are available from the Cisco Security
Advisories and Alerts page, to determine exposure and a complete upgrade
solution.
In all cases, customers should ensure that the devices to be upgraded contain
sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release. If
the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance providers.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described
in this advisory.

Source

This vulnerability was found during the resolution of a Cisco TAC support
case.

Cisco Security Vulnerability Policy

To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.

URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180307-550x

Revision History

Version	Description		Section		Status	Date
1.0	Initial public release.			Final	2018-February-14

Legal Disclaimer

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GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.

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