A vulnerability has been found in F5 BIG-IP up to 11.5.6/11.6.3.2/12.1.3.5/13.1.0.7/14.0.0.2 (Firewall Software) and classified as problematic. Affected by this vulnerability is an unknown code block of the component SSL Virtual Server. The manipulation with an unknown input leads to a cryptographic issues vulnerability. The CWE definition for the vulnerability is CWE-310. As an impact it is known to affect availability. The summary by CVE is:

In BIG-IP 14.0.0-14.0.0.2, 13.0.0-13.1.0.7, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.2.1-11.5.6, an attacker sending specially crafted SSL records to a SSL Virtual Server will cause corruption in the SSL data structures leading to intermittent decrypt BAD_RECORD_MAC errors. Clients will be unable to access the application load balanced by a virtual server with an SSL profile until tmm is restarted.

The bug was discovered 11/01/2018. The weakness was published 10/30/2018 (Website). It is possible to read the advisory at support.f5.com. This vulnerability is known as CVE-2018-15317 since 08/14/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1600 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 118661 (F5 Networks BIG-IP : TMM vulnerability (K43625118)), 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 371355 (F5 BIG-IP ASM,LTM,APM TMM (SSL Virtual Servers) Denial of Service Vulnerability (K43625118)).

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

The vulnerability is also documented in the vulnerability database at Tenable (118661). Similar entries are available at VDB-126359, VDB-126358, VDB-126357 and VDB-126356. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 11.5.0
• 11.5.1
• 11.5.2
• 11.5.3
• 11.5.4
• 11.5.5
• 11.5.6
• 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
• 13.1.0.0
• 13.1.0.1
• 13.1.0.2
• 13.1.0.3
• 13.1.0.4
• 13.1.0.5
• 13.1.0.6
• 13.1.0.7
• 14.0.0.0
• 14.0.0.1
• 14.0.0.2

License

• commercial

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

• 🔍
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CVSSv4info

CVSSv3info

CVSSv2info

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Entryinfo

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