ESB-2017.2247 - [Cisco] Cisco IOS and Cisco IOS XE Software IPv6 SNMP: Denial of service - Existing account 2017-09-07

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2247
           Cisco IOS and Cisco IOS XE Software IPv6 SNMP Message
                 Handling Denial of Service Vulnerability
                             7 September 2017

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

Product:           Cisco IOS and Cisco IOS XE Software IPv6 SNMP
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12211  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-snmp

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Cisco IOS and Cisco IOS XE Software IPv6 SNMP Message Handling Denial of 
Service Vulnerability

Medium

Advisory ID: cisco-sa-20170906-snmp

First Published: 2017 September 6 16:00 GMT

Version 1.0: Final

Workarounds: Yes

Cisco Bug IDs:

CSCvb14640

CVSS Score:

Base 6.3

Base 6.3 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

CVE-2017-12211

CWE-399

Summary

A vulnerability in the IPv6 Simple Network Management Protocol (SNMP) code of
Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote 
attacker to cause high CPU usage or a reload of the device.

The vulnerability is due to IPv6 sub block corruption. An attacker could 
exploit this vulnerability by polling the affected device IPv6 information. An
exploit could allow the attacker to trigger high CPU usage or a reload of the
device.

There are workarounds that address this vulnerability.

This advisory is available at the following link:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-snmp

Affected Products

Vulnerable Products

This vulnerability affects Cisco IOS and IOS XE Software. For information 
about affected software releases, consult the Cisco bug ID at the top of this
advisory.

Products Confirmed Not Vulnerable

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

Workarounds

The workaround for this vulnerability is to filter object identifiers (OIDs) 
that would poll for IPv6 sub block information. For details on employing the 
workaround for this vulnerability, consult the Cisco bug ID at the top of this
advisory.

Fixed Software

For information about fixed software releases, consult the Cisco bug ID 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 support case.

URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-snmp

Revision History

Version 	Description 		Section Status 	Date

1.0 		Initial public release. 	Final 	2017-September-06

LEGAL DISCLAIMER

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF 
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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