Vulnerability Name:

CVE-2019-1672 (CCN-156625)

Assigned:2018-12-06
Published:2019-02-06
Updated:2019-10-09
Summary:A vulnerability in the Decryption Policy Default Action functionality of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured drop policy and allow traffic onto the network that should have been denied. The vulnerability is due to the incorrect handling of SSL-encrypted traffic when Decrypt for End-User Notification is disabled in the configuration. An attacker could exploit this vulnerability by sending a SSL connection through the affected device. A successful exploit could allow the attacker to bypass a configured drop policy to block specific SSL connections. Releases 10.1.x and 10.5.x are affected.
CVSS v3 Severity:5.8 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
5.1 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/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): Low
Availibility (A): None
5.8 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N)
5.1 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/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): Low
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-400
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2019-1672

Source: BID
Type: Third Party Advisory
106904

Source: XF
Type: UNKNOWN
cisco-wsa-cve20191672-sec-bypass(156625)

Source: CCN
Type: Cisco Security Advisory cisco-sa-20190206-wsa-bypass
Cisco Web Security Appliance Decryption Policy Bypass Vulnerability

Source: CISCO
Type: Third Party Advisory
20190206 Cisco Web Security Appliance Decryption Policy Bypass Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:web_security_appliance:10.1.0-204:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:web_security_appliance:10.5.2-072:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:web_security_appliance:11.5.1-fcs-115:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:cisco:web_security_appliance_(wsa):5.6.0-623:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco web security appliance 10.1.0-204
    cisco web security appliance 10.5.2-072
    cisco web security appliance 11.5.1-fcs-115
    cisco web security appliance (wsa) 5.6.0-623