F5 Networks BIG-IP : F5 IPsec vulnerability (K76610106)

medium Nessus Plugin ID 142046

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

The version of F5 Networks BIG-IP installed on the remote host is prior to 14.1.0. It is, therefore, affected by a vulnerability as referenced in the K76610106 advisory.

When negotiating IPsec tunnels with configured, authenticated peers, the peer may negotiate a different key length than the BIG-IP configuration would otherwise allow.(CVE-2020-5938)ImpactIPsec connections can be created with a different key length than specified in the BIG-IP configuration, potentially leading to lesser-than-configured encryption strength for the connection.For example, if the BIG-IP system was configured for AES256 encryption, the Security Associationcould be successfully negotiated using AES128 encryption. It is not possible to change the algorithm, or to disable encryption, but it is possible for peers to modify the key length and still successfully negotiate an IPsec connection.

Tenable has extracted the preceding description block directly from the F5 Networks BIG-IP security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K76610106.

Plugin Details

Severity: Medium

ID: 142046

File Name: f5_bigip_SOL76610106.nasl

Version: 1.5

Type: local

Family: F5 Networks Local Security Checks

Published: 10/29/2020

Updated: 12/11/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS Score Source: CVE-2020-5938

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:f5:big-ip_link_controller, cpe:/a:f5:big-ip_application_visibility_and_reporting, cpe:/a:f5:big-ip_domain_name_system, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/h:f5:big-ip, cpe:/a:f5:big-ip_application_security_manager, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_access_policy_manager, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_application_acceleration_manager

Required KB Items: Host/local_checks_enabled, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version

Exploit Ease: No known exploits are available

Patch Publication Date: 10/28/2020

Vulnerability Publication Date: 10/29/2020

Reference Information

CVE: CVE-2020-5938

Detections

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