Vulnerability Name:

CVE-2020-3125 (CCN-181548)

Assigned:2019-12-12
Published:2020-05-06
Updated:2020-05-14
Summary: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.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:6.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
7.6 High (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-287
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-3125

Source: XF
Type: UNKNOWN
cisco-cve20203125-sec-bypass(181548)

Source: CCN
Type: Cisco Security Advisory cisco-asa-kerberos-bypass-96Gghe2sS
Cisco Adaptive Security Appliance Software Kerberos Authentication Bypass Vulnerability

Source: CISCO
Type: Vendor Advisory
20200506 Cisco Adaptive Security Appliance Software Kerberos Authentication Bypass Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/o:cisco:asa_5505_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5505:-:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:cisco:asa_5510_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5510:-:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:cisco:asa_5512-x_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5512-x:-:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/o:cisco:asa_5515-x_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5515-x:-:*:*:*:*:*:*:*

    • Configuration 5:
  • cpe:/o:cisco:asa_5520_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5520:-:*:*:*:*:*:*:*

    • Configuration 6:
  • cpe:/o:cisco:asa_5525-x_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5525-x:-:*:*:*:*:*:*:*

    • Configuration 7:
  • cpe:/o:cisco:asa_5540_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5540:-:*:*:*:*:*:*:*

    • Configuration 8:
  • cpe:/o:cisco:asa_5545-x_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5545-x:-:*:*:*:*:*:*:*

    • Configuration 9:
  • cpe:/o:cisco:asa_5550_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5550:-:*:*:*:*:*:*:*

    • Configuration 10:
  • cpe:/o:cisco:asa_5555-x_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5555-x:-:*:*:*:*:*:*:*

    • Configuration 11:
  • cpe:/o:cisco:asa_5580_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5580:-:*:*:*:*:*:*:*

    • Configuration 12:
  • cpe:/o:cisco:asa_5585-x_firmware:9.10(1.220):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5585-x:-:*:*:*:*:*:*:*

    • Configuration 13:
  • cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.8 and < 9.8.4.15)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.9 and < 9.9.2.66)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.10 and < 9.10.1.37)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.12 and < 9.12.3.2)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.13 and < 9.13.1.7)

    • Configuration CCN 1:
  • cpe:/a:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    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 *
    cisco adaptive security appliance *
    cisco adaptive security appliance *
    cisco adaptive security appliance *
    cisco adaptive security appliance *
    cisco adaptive security appliance software *