#VU8688 Authentication bypass in Cisco IOS XE - CVE-2017-12236
Published: October 4, 2017
Vulnerability identifier: #VU8688
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2017-12236
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cisco IOS XE
Cisco IOS XE
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote attacker to bypass authentication on the target system.
The weakness exists in the implementation of the Locator/ID Separation Protocol (LISP) in Cisco IOS XE Software due to a logic error introduced via a code regression. A remote attacker can send specific valid map-registration requests, which will be accepted by the MS/MR even if the authentication keys do not match, inject invalid mappings of EIDs to RLOCs in the MS/MR of the affected software and bypass authentication.
Remediation
Install update from vendor's website.