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AUSCERT External Security Bulletin Redistribution
ESB-2015.3220
Cisco IOS and IOS XE Software IKEv1 State Machine Denial of
Service Vulnerability
23 December 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS and IOS XE
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6429
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151218-ios
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Cisco Security Advisory
Cisco IOS and IOS XE Software IKEv1 State Machine Denial of Service
Vulnerability
Medium
Advisory ID:
cisco-sa-20151218-ios
Published:
2015 December 18 08:00 GMT
Version 1.0:
Final
CVSS Score:
Base - 5.0
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCuw08236
CVE-2015-6429
CWE-119
Summary
A vulnerability in the Internet Key Exchange (IKEv1) state machine of
Cisco IOS and Cisco IOS XE Software could allow an unauthenticated,
remote attacker to tear down valid IPsec connections, resulting in a
partial denial of service (DoS) condition.
The vulnerability is due to insufficient condition checks in the IKEv1
state machine. An attacker could exploit this vulnerability by sending
a spoofed, specific IKEv1 packet to an endpoint of an IPsec tunnel. A
successful exploit could allow the attacker to tear down IPsec tunnels
that terminate on the endpoint, causing a partial DoS condition.
Cisco has released software updates that address this
vulnerability. There are no workarounds that mitigate this vulnerability.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151218-ios
Affected Products
Vulnerable Products
Cisco IOS and Cisco IOS XE Software Releases prior to 15.5(2)S2
(3.15.2S), 15.5(2)T2, 15.5(3)M1, 15.5(3)S1 (3.16.1S), 15.6(1)S (3.17.1S),
and 15.6(1)T are vulnerable.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Workarounds
There are no workarounds that mitigate this vulnerability.
Fixed Software
When considering software upgrades, customers are advised to
consult the Cisco Security Advisories and Responses archive at
http://www.cisco.com/go/psirt and review subsequent advisories to
determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade
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.
URL
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151218-ios
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2015-December-18
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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