F5 BIG-IP up to 15.1.0.1 SSL Certificate Revoked Certificate certificate validation

Summaryinfo

A vulnerability classified as critical was found in F5 BIG-IP up to 11.6.5.2/12.1.5.1/13.1.3.4/14.1.2.3/15.1.0.1. This affects an unknown function of the component SSL Certificate Handler. Executing a manipulation as part of Revoked Certificate can lead to certificate validation. This vulnerability is registered as CVE-2020-5913. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in F5 BIG-IP up to 11.6.5.2/12.1.5.1/13.1.3.4/14.1.2.3/15.1.0.1 (Firewall Software). This vulnerability affects an unknown function of the component SSL Certificate Handler. The manipulation as part of a Revoked Certificate leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In versions 15.0.0-15.1.0.1, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, the BIG-IP Server SSL profile ignores revoked certificates, even when a valid CRL is present. This impacts server-side connections and may result in a man-in-the-middle attack on the connections.

The weakness was published 08/26/2020 (Website). The advisory is shared for download at support.f5.com. This vulnerability was named CVE-2020-5913 since 01/06/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/26/2020). The MITRE ATT&CK project declares the attack technique as T1587.003.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entries are available at VDB-160303, VDB-160302 and VDB-160299. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 11.6.5.0
• 11.6.5.1
• 11.6.5.2
• 12.1.5.0
• 12.1.5.1
• 13.1.3.0
• 13.1.3.1
• 13.1.3.2
• 13.1.3.3
• 13.1.3.4
• 14.1.2.0
• 14.1.2.1
• 14.1.2.2
• 14.1.2.3
• 15.1.0.0
• 15.1.0.1

License

• commercial

Website

• Vendor: https://f5.com/

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Once again VulDB remains the best source for vulnerability data.

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