Detections
Analytics
Cisco IOS XE Software MACsec MKA Using EAP-TLS Authentication Bypass (cisco-sa-20180926-macsec)
high Nessus Plugin ID 132104
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Synopsis
The remote device is missing a vendor-supplied security patch.Description
According to its self-reported version, Cisco IOS XE Software is affected by an authentication bypass vulnerability in the MACsec Key Agreement (MKA) using Extensible Authentication Protocol-Transport Layer Security (EAP-TLS) functionality due to a logic error. An unauthenticated, adjacent attacker can exploit this, by connecting to and passing traffic through a Layer 3 interface of an affected device, if the interface is configured for MACsec MKA using EAP-TLS and is running in 'access-session closed' mode. A successful exploit allows the attacker to bypass 802.1x network access controls and gain access to the network.Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID(s) CSCvh09411.See Also
Plugin Details
Severity: High
ID: 132104
File Name: cisco-sa-20180926-macsec.nasl
Version: 1.8
Type: local
Family: CISCO
Published: 12/18/2019
Updated: 5/6/2021
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.2
CVSS v2
Risk Factor: Medium
Base Score: 4.8
Temporal Score: 3.5
Vector: CVSS2#AV:A/AC:L/Au:N/C:P/I:P/A:N
CVSS Score Source: CVE-2018-15372
CVSS v3
Risk Factor: High
Base Score: 8.1
Temporal Score: 7.1
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:cisco:ios_xe
Required KB Items: Host/Cisco/IOS-XE/Version
Exploit Ease: No known exploits are available
Patch Publication Date: 9/26/2018
Vulnerability Publication Date: 9/26/2018
Reference Information
CVE: CVE-2018-15372
BID: 105416
CISCO-SA: cisco-sa-20180926-macsec
CISCO-BUG-ID: CSCvh09411