Vulnerability CVE-2022-20940

Vulnerability Name:

CVE-2022-20940 (CCN-240211)

Assigned:

2021-11-02

Published:

2022-11-09

Updated:

2022-11-22

Summary:

A vulnerability in the TLS handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to gain access to sensitive information. This vulnerability is due to improper implementation of countermeasures against a Bleichenbacher attack on a device that uses SSL decryption policies. An attacker could exploit this vulnerability by sending crafted TLS messages to an affected device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device.

CVSS v3 Severity:

5.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
4.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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): Unchanged
Impact Metrics:	Confidentiality (C): Low Integrity (I): None Availibility (A): None

4.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
3.8 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): Low Integrity (I): None Availibility (A): None

CVSS v2 Severity:

4.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Partial Integrity (I): None Availibility (A): None

Vulnerability Type:

CWE-203

Vulnerability Consequences:

Obtain Information

References:

Source: MITRE
Type: CNA
CVE-2022-20940

Source: XF
Type: UNKNOWN
cisco-ftd-cve202220940-info-disc(240211)

Source: CCN
Type: Cisco Security Advisory cisco-sa-ftd-tls-bb-rCgtmY2
Cisco Firepower Threat Defense Software SSL Decryption Policy Bleichenbacher Attack Vulnerability

Source: MISC
Type: Patch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tls-bb-rCgtmY2

Vulnerable Configuration:

Configuration 1:

cpe:/a:cisco:firepower_threat_defense:6.6.0.1:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:6.6.0:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:7.1.0.0:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.7.0 and <= 6.7.0.3)

OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.5.0 and <= 6.5.0.5)

OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.3.0 and <= 6.3.0.5)

OR cpe:/a:cisco:firepower_threat_defense:6.6.1:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:6.6.3:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:6.6.4:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.2.3 and <= 6.2.3.18)

OR cpe:/a:cisco:firepower_threat_defense:6.6.5:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:6.6.5.1:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:6.6.5.2:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.4.0 and <= 6.4.0.14)

OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 7.0.0 and <= 7.0.3)

OR cpe:/a:cisco:firepower_threat_defense:7.1.0.1:*:*:*:*:*:*:*

OR cpe:/a:cisco:firepower_threat_defense:7.1.0.2:*:*:*:*:*:*:*

Denotes that component is vulnerable

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