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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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