Detections
Analytics
Cisco Adaptive Security Appliance Software Kerberos Authentication Bypass (cisco-asa-kerberos-bypass-96Gghe2sS)
critical Nessus Plugin ID 137557
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Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco Adaptive Security Appliance (ASA) Software is affected by a vulnerability in the Kerberos authentication feature due to insufficient identity verification of the Kerberos key distribution center (KDC) when a successful authentication response is received. An unauthenticated, remote attacker can exploit this, by spoofing the KDC server response to the ASA device, in order to bypass Kerberos authentication.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 CSCvq73534See Also
http://www.nessus.org/u?441ad885
http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-73830
Plugin Details
Severity: Critical
ID: 137557
File Name: cisco-asa-kerberos-bypass-96Gghe2sS.nasl
Version: 1.13
Type: local
Family: CISCO
Published: 6/17/2020
Updated: 3/31/2023
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2020-3125
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:cisco:adaptive_security_appliance
Required KB Items: Host/Cisco/ASA
Exploit Ease: No known exploits are available
Patch Publication Date: 5/6/2020
Vulnerability Publication Date: 5/6/2020
Reference Information
CVE: CVE-2020-3125