Vulnerability Name:

CVE-2020-3565 (CCN-190361)

Assigned:2019-12-12
Published:2020-10-21
Updated:2020-10-23
Summary:A vulnerability in the TCP Intercept functionality of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured Access Control Policies (including Geolocation) and Service Polices on an affected system. The vulnerability exists because TCP Intercept is invoked when the embryonic connection limit is reached, which can cause the underlying detection engine to process the packet incorrectly. An attacker could exploit this vulnerability by sending a crafted stream of traffic that matches a policy on which TCP Intercept is configured. A successful exploit could allow the attacker to match on an incorrect policy, which could allow the traffic to be forwarded when it should be dropped. In addition, the traffic could incorrectly be dropped.
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:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
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-287
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-3565

Source: XF
Type: UNKNOWN
cisco-cve20203565-sec-bypass(190361)

Source: CCN
Type: Cisco Security Advisory cisco-sa-tcp-intercept-bypass-xG9M3PbY
Cisco Firepower Threat Defense Software TCP Intercept Bypass Vulnerability

Source: CISCO
Type: Vendor Advisory
20201021 Cisco Firepower Threat Defense Software TCP Intercept Bypass Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version < 6.4.0.8)
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.5.0 and < 6.5.0.4)
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.5.0.5 and < 6.6.0)

    • * Denotes that component is vulnerable
    BACK
    cisco firepower threat defense *
    cisco firepower threat defense *
    cisco firepower threat defense *