F5 BIG-IP up to 11.6.3.2/12.1.3.6/13.0.1 HTTP Health Monitor input validation

Summaryinfo

A vulnerability was found in F5 BIG-IP up to 11.6.3.2/12.1.3.6/13.0.1. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component HTTP Health Monitor. Performing a manipulation results in input validation. This vulnerability is cataloged as CVE-2018-5542. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in F5 BIG-IP up to 11.6.3.2/12.1.3.6/13.0.1 (Firewall Software). It has been classified as critical. This affects an unknown function of the component HTTP Health Monitor. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

F5 BIG-IP 13.0.0-13.0.1, 12.1.0-12.1.3.6, or 11.2.1-11.6.3.2 HTTPS health monitors do not validate the identity of the monitored server.

The bug was discovered 07/25/2018. The weakness was shared 07/25/2018 (Website). It is possible to read the advisory at support.f5.com. This vulnerability is uniquely identified as CVE-2018-5542 since 01/11/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 118622 (F5 Networks BIG-IP : HTTPS monitor vulnerability (K05112543)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371102 (F5 BIG-IP ASM HTTPS monitor vulnerability (K05112543)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118622). The entry VDB-122195 is related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 11.6.3.0
• 11.6.3.1
• 11.6.3.2
• 12.1.3.0
• 12.1.3.1
• 12.1.3.2
• 12.1.3.3
• 12.1.3.4
• 12.1.3.5
• 12.1.3.6
• 13.0.0
• 13.0.1

License

• commercial

Website

• Vendor: https://f5.com/

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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