Vulnerability identifier: #VU11359

Vulnerability risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0163

CWE-ID: CWE-287

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description
The vulnerability allows an adjacent unauthenticated attacker to bypass authentication on the target system.

The weakness exists in the 802.1x multiple-authentication (multi-auth) feature due to logic change error introduced into the code. An adjacent attacker can try to access an 802.1x multi-auth port after a successful supplicant has authenticated and bypass the 802.1x access controls.

Mitigation
Update to versions 15.7(3.1.14A)OT, 15.7(3.1.10U)OT, 15.7(3.0z)M, 15.7(2.0v)M0.6, 15.6(3)M4, 15.6(3)M3.1 or 15.5(3)M7.

Vulnerable software versions

Cisco IOS XE: 15.4.3.0i M6 - 15.7.3 M

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dot1x

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.