SYN flood denial of service in BIG-IP SNAT implementation



Published: 2021-03-11

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU51419

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-22998

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('Resource Exhaustion')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to SYN flood protection thresholds are not enforced in secure network address translation (SNAT) listeners. A remote attacker can perform SYN flood class attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 11.6.1 - 16.0.1

BIG-IP LTM: 11.6.1 - 16.0.1

BIG-IP AAM: 11.6.1 - 16.0.1

BIG-IP AFM: 11.6.1 - 16.0.1

BIG-IP Analytics: 11.6.1 - 16.0.1

BIG-IP APM: 11.6.1 - 16.0.1

BIG-IP ASM: 11.6.1 - 16.0.1

BIG-IP DNS: 11.6.1 - 16.0.1

BIG-IP FPS: 11.6.1 - 16.0.1

BIG-IP GTM: 11.6.1 - 16.0.1

BIG-IP Link Controller: 11.6.1 - 16.0.1

BIG-IP PEM: 11.6.1 - 16.0.1


CPE2.3 External links

http://support.f5.com/csp/article/K31934524

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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