Denial of service in BIG-IP TMM

1) Infinite loop

EUVDB-ID: #VU52749

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23009

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists due to infinite loop when processing HTTP/2 requests in TMM module. A remote attacker can send specially crafted HTTP/2 packets to the system and cause a denial of service condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 15.1.0 - 16.0.1

BIG-IP LTM: 15.1.0 - 16.0.1

BIG-IP AAM: 15.1.0 - 16.0.1

BIG-IP Advanced WAF: 15.1.0 - 16.0.1

BIG-IP AFM: 15.1.0 - 16.0.1

BIG-IP Analytics: 15.1.0 - 16.0.1

BIG-IP APM: 15.1.0 - 16.0.1

BIG-IP ASM: 15.1.0 - 16.0.1

BIG-IP DDHD: 15.1.0 - 16.0.1

BIG-IP DNS: 15.1.0 - 16.0.1

BIG-IP FPS: 15.1.0 - 16.0.1

BIG-IP GTM: 15.1.0 - 16.0.1

BIG-IP Link Controller: 15.1.0 - 16.0.1

BIG-IP PEM: 15.1.0 - 16.0.1

BIG-IP SSLO: 15.1.0 - 16.0.1

External links

http://support.f5.com/csp/article/K90603426

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.