Vulnerability Name:

CVE-2019-1873 (CCN-163563)

Assigned:2018-12-06
Published:2019-07-10
Updated:2020-10-16
Summary:A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly. The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An attacker could exploit this vulnerability by sending a crafted TLS/SSL packet to an interface on the targeted device. An exploit could allow the attacker to cause the device to reload, which will result in a denial of service (DoS) condition.
Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed and transparent firewall mode and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. A valid SSL or TLS session is required to exploit this vulnerability.
CVSS v3 Severity:8.6 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
8.6 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/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): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:7.8 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-20
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2019-1873

Source: BID
Type: Third Party Advisory, VDB Entry
109123

Source: XF
Type: UNKNOWN
cisco-cve20191873-dos(163563)

Source: CCN
Type: Cisco Security Advisory cisco-sa-20190710-asa-ftd-dos
Cisco ASA and FTD Software Cryptographic TLS and SSL Driver Denial of Service Vulnerability

Source: CISCO
Type: Vendor Advisory
20190710 Cisco ASA and FTD Software Cryptographic TLS and SSL Driver Denial of Service Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/o:cisco:asa_5506-x_firmware:9.6(4.16):*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5506-x_firmware:9.8(3.8):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5506-x:-:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:cisco:asa_5506h-x_firmware:9.6(4.16):*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5506h-x_firmware:9.8(3.8):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5506h-x:-:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:cisco:asa_5506w-x_firmware:9.6(4.16):*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5506w-x_firmware:9.8(3.8):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5506w-x:-:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/o:cisco:asa_5508-x_firmware:9.6(4.16):*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5508-x_firmware:9.8(3.8):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5508-x:-:*:*:*:*:*:*:*

    • Configuration 5:
  • cpe:/o:cisco:asa_5516-x_firmware:9.6(4.16):*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5516-x_firmware:9.8(3.8):*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5516-x:-:*:*:*:*:*:*:*

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

    • * Denotes that component is vulnerable
    BACK
    cisco asa 5506-x firmware 9.6(4.16)
    cisco asa 5506-x firmware 9.8(3.8)
    cisco asa 5506-x -
    cisco asa 5506h-x firmware 9.6(4.16)
    cisco asa 5506h-x firmware 9.8(3.8)
    cisco asa 5506h-x -
    cisco asa 5506w-x firmware 9.6(4.16)
    cisco asa 5506w-x firmware 9.8(3.8)
    cisco asa 5506w-x -
    cisco asa 5508-x firmware 9.6(4.16)
    cisco asa 5508-x firmware 9.8(3.8)
    cisco asa 5508-x -
    cisco asa 5516-x firmware 9.6(4.16)
    cisco asa 5516-x firmware 9.8(3.8)
    cisco asa 5516-x -
    cisco adaptive security appliance software *
    cisco firepower threat defense software *