Denial of service in BIG-IP MPTCP



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-23003
CWE-ID CWE-399
Exploitation vector Network
Public exploit N/A
Vulnerable software
BIG-IP
Hardware solutions / Firmware

BIG-IP DDHD
Hardware solutions / Firmware

BIG-IP SSLO
Hardware solutions / Firmware

BIG-IP LTM
Hardware solutions / Security hardware applicances

BIG-IP AFM
Hardware solutions / Security hardware applicances

BIG-IP Analytics
Hardware solutions / Security hardware applicances

BIG-IP APM
Hardware solutions / Security hardware applicances

BIG-IP ASM
Hardware solutions / Security hardware applicances

BIG-IP FPS
Hardware solutions / Security hardware applicances

BIG-IP GTM
Hardware solutions / Security hardware applicances

BIG-IP PEM
Hardware solutions / Security hardware applicances

BIG-IP AAM
Hardware solutions / Routers & switches, VoIP, GSM, etc

BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc

BIG-IP Link Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc

BIG-IP Advanced WAF
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor F5 Networks

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource management error

EUVDB-ID: #VU51491

Risk: Medium

CVSSv4.0: [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-23003

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper management of internal resources within the application when processing MPTCP traffic. A remote attacker can send specially crafted data to the system and force TMM to produce a core file, resulting in denial of service.

The vulnerability can be also triggered in rare circumstances by running the tmsh show conn command.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 11.6.1 HF1 - 16.0.1

BIG-IP LTM: 11.6.1 HF1 - 16.0.1

BIG-IP AAM: 11.6.1 HF1 - 16.0.1

BIG-IP Advanced WAF: 11.6.1 - 16.0.1

BIG-IP AFM: 11.6.1 HF1 - 16.0.1

BIG-IP Analytics: 11.6.1 HF1 - 16.0.1

BIG-IP APM: 11.6.1 HF1 - 16.0.1

BIG-IP ASM: 11.6.1 HF1 - 16.0.1

BIG-IP DDHD: 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 HF1 - 16.0.1

BIG-IP Link Controller: 11.6.1 HF1 - 16.0.1

BIG-IP PEM: 11.6.1 HF1 - 16.0.1

BIG-IP SSLO: 11.6.1 - 16.0.1

CPE2.3 External links

http://support.f5.com/csp/article/K43470422


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.



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