QID 376752

Date Published: 2022-07-27

QID 376752: F5 BIG-IP Application Security Manager (ASM), Local Traffic Manager (LTM), Access Policy Manager (APM) Diffie-Hellman key agreement protocol Vulnerability (K83120834)

The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.CVE-2002-20001

Vulnerable Component: BIG-IP ASM,LTM,APM

Affected Versions:
17.0.0
16.1.0 - 16.1.2
15.1.0 - 15.1.5
14.1.0 - 14.1.4
13.1.0 - 13.1.5

QID Detection Logic(Authenticated):
This QID checks for the vulnerable versions of F5 BIG-IP devices using the tmsh command.

This vulnerability allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, also known as a D(HE)ater attack.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    For more information about patch details please refer to K83120834
    Vendor References

    CVEs related to QID 376752

    CVE-2002-20001 |
    Software Advisories
    Advisory ID Software Component Link
    K83120834 URL Logo support.f5.com/csp/article/K83120834
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