CVE-2017-12236

Description

A vulnerability in the implementation of the Locator/ID Separation Protocol (LISP) in Cisco IOS XE 3.2 through 16.5 could allow an unauthenticated, remote attacker using an x tunnel router to bypass authentication checks performed when registering an Endpoint Identifier (EID) to a Routing Locator (RLOC) in the map server/map resolver (MS/MR). The vulnerability is due to a logic error introduced via a code regression for the affected software. An attacker could exploit this vulnerability by sending specific valid map-registration requests, which will be accepted by the MS/MR even if the authentication keys do not match, to the affected software. A successful exploit could allow the attacker to inject invalid mappings of EIDs to RLOCs in the MS/MR of the affected software. This vulnerability affects Cisco devices that are configured with LISP acting as an IPv4 or IPv6 map server. This vulnerability affects Cisco IOS XE Software release trains 3.9E and Everest 16.4. Cisco Bug IDs: CSCvc18008.

Category

9.8
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 7.73% Top 10%
Vendor Advisory cisco.com
Affected: n/a Cisco IOS XE
Published at:
Updated at:

References

Link Tags
http://www.securityfocus.com/bid/101033 vdb entry third party advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-lisp vendor advisory
http://www.securitytracker.com/id/1039448 vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2017-12236?
CVE-2017-12236 has been scored as a critical severity vulnerability.
How to fix CVE-2017-12236?
To fix CVE-2017-12236, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-12236 being actively exploited in the wild?
It is possible that CVE-2017-12236 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~8% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-12236?
CVE-2017-12236 affects n/a Cisco IOS XE.
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