CVE-2020-3125

Cisco Adaptive Security Appliance Software Kerberos Authentication Bypass Vulnerability

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

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.

Una vulnerabilidad en la funcionalidad de autenticación de Kerberos del Cisco Adaptive Security Appliance (ASA) Software, podría permitir a un atacante remoto no autenticado suplantar al centro de distribución de claves (KDC) de Kerberos y omitir la autenticación sobre un dispositivo afectado que esté configurado para realizar la autenticación Kerberos para VPN o acceso local a dispositivos. La vulnerabilidad es debido a una verificación de identidad insuficiente del KDC cuando es recibida una respuesta de autenticación con éxito. Un atacante podría explotar esta vulnerabilidad al suplantar la respuesta del servidor KDC en el dispositivo ASA. Esta respuesta maliciosa no habría sido autenticada por el KDC. Un ataque con éxito podría permitir a un atacante omitir la autenticación de Kerberos.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2019-12-12 CVE Reserved
2020-05-06 CVE Published
2024-06-15 EPSS Updated
2024-11-15 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-287: Improper Authentication

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-asa-kerberos-bypass-96Gghe2sS	2023-08-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Asa 5505 Firmware Search vendor "Cisco" for product "Asa 5505 Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5505 Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5505 Search vendor "Cisco" for product "Asa 5505"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5510 Firmware Search vendor "Cisco" for product "Asa 5510 Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5510 Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5510 Search vendor "Cisco" for product "Asa 5510"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5512-x Firmware Search vendor "Cisco" for product "Asa 5512-x Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5512-x Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5512-x Search vendor "Cisco" for product "Asa 5512-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5515-x Firmware Search vendor "Cisco" for product "Asa 5515-x Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5515-x Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5515-x Search vendor "Cisco" for product "Asa 5515-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5520 Firmware Search vendor "Cisco" for product "Asa 5520 Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5520 Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5520 Search vendor "Cisco" for product "Asa 5520"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5525-x Firmware Search vendor "Cisco" for product "Asa 5525-x Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5525-x Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5525-x Search vendor "Cisco" for product "Asa 5525-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5540 Firmware Search vendor "Cisco" for product "Asa 5540 Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5540 Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5540 Search vendor "Cisco" for product "Asa 5540"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5545-x Firmware Search vendor "Cisco" for product "Asa 5545-x Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5545-x Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5545-x Search vendor "Cisco" for product "Asa 5545-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5550 Firmware Search vendor "Cisco" for product "Asa 5550 Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5550 Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5550 Search vendor "Cisco" for product "Asa 5550"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5555-x Firmware Search vendor "Cisco" for product "Asa 5555-x Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5555-x Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5555-x Search vendor "Cisco" for product "Asa 5555-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5580 Firmware Search vendor "Cisco" for product "Asa 5580 Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5580 Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5580 Search vendor "Cisco" for product "Asa 5580"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5585-x Firmware Search vendor "Cisco" for product "Asa 5585-x Firmware"	9.10\(1.220\) Search vendor "Cisco" for product "Asa 5585-x Firmware" and version "9.10\(1.220\)"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5585-x Search vendor "Cisco" for product "Asa 5585-x"	-	-	Safe
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.8 < 9.8.4.15 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.8 < 9.8.4.15"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.9 < 9.9.2.66 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.9 < 9.9.2.66"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.10 < 9.10.1.37 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.10 < 9.10.1.37"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.12 < 9.12.3.2 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.12 < 9.12.3.2"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.13 < 9.13.1.7 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.13 < 9.13.1.7"		-		Affected