critical
9.8
CWE
287
Advisory Published
Updated

CVE-2020-3125: Cisco Adaptive Security Appliance Software Kerberos Authentication Bypass Vulnerability

First published: Wed May 06 2020(Updated: )

A vulnerability in the Kerberos authentication feature of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to impersonate the Kerberos key distribution center (KDC) and bypass authentication on an affected device that is configured to perform Kerberos authentication for VPN or local device access. The vulnerability is due to insufficient identity verification of the KDC when a successful authentication response is received. An attacker could exploit this vulnerability by spoofing the KDC server response to the ASA device. This malicious response would not have been authenticated by the KDC. A successful attack could allow an attacker to bypass Kerberos authentication.

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Asa 5505 Firmware=9.10\(1.220\)
Cisco Asa 5505
Cisco Asa 5510 Firmware=9.10\(1.220\)
Cisco Asa 5510
Cisco Asa 5512-x Firmware=9.10\(1.220\)
Cisco Asa 5512-x
Cisco Asa 5515-x Firmware=9.10\(1.220\)
Cisco Asa 5515-x
Cisco Asa 5520 Firmware=9.10\(1.220\)
Cisco Asa 5520
Cisco Asa 5525-x Firmware=9.10\(1.220\)
Cisco Asa 5525-x
Cisco Asa 5540 Firmware=9.10\(1.220\)
Cisco Asa 5540
Cisco Asa 5545-x Firmware=9.10\(1.220\)
Cisco Asa 5545-x
Cisco Asa 5550 Firmware=9.10\(1.220\)
Cisco Asa 5550
Cisco Asa 5555-x Firmware=9.10\(1.220\)
Cisco Asa 5555-x
Cisco Asa 5580 Firmware=9.10\(1.220\)
Cisco Asa 5580
Cisco Asa 5585-x Firmware=9.10\(1.220\)
Cisco Asa 5585-x
Cisco Adaptive Security Appliance Software>=9.8<9.8.4.15
Cisco Adaptive Security Appliance Software>=9.9<9.9.2.66
Cisco Adaptive Security Appliance Software>=9.10<9.10.1.37
Cisco Adaptive Security Appliance Software>=9.12<9.12.3.2
Cisco Adaptive Security Appliance Software>=9.13<9.13.1.7

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-3125?

    CVE-2020-3125 is a vulnerability in the Kerberos authentication feature of Cisco Adaptive Security Appliance (ASA) Software.

  • How severe is CVE-2020-3125?

    CVE-2020-3125 has a severity rating of 9.8 (Critical).

  • Which software versions are affected by CVE-2020-3125?

    Cisco ASA Software versions 9.8 to 9.13 are affected by CVE-2020-3125.

  • How can an attacker exploit CVE-2020-3125?

    An unauthenticated, remote attacker can exploit CVE-2020-3125 to impersonate the Kerberos key distribution center (KDC) and bypass authentication on an affected device.

  • Where can I find more information about CVE-2020-3125?

    More information about CVE-2020-3125 can be found in the Cisco Security Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-asa-kerberos-bypass-96Gghe2sS

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