Buffer overflow in iRules LX component in F5 BIG-IP products

1) Out-of-bounds write

EUVDB-ID: #VU50610

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-2021-22973

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error within the JSON parser function in iRules LX component. A remote attacker can pass specially crafted data with iRules LX commands to the system, trigger out-of-bounds write and crash the Traffic Management Microkernel (TMM) module.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP: 12.1.0 - 16.0.1

BIG-IP LTM: 12.1.0 - 16.0.1

BIG-IP AAM: 12.1.0 - 16.0.1

BIG-IP AFM: 12.1.0 - 16.0.1

BIG-IP Analytics: 12.1.0 - 16.0.1

BIG-IP APM: 12.1.0 - 16.0.1

BIG-IP ASM: 12.1.0 - 16.0.1

BIG-IP DNS: 12.1.0 - 16.0.1

BIG-IP FPS: 12.1.0 - 16.0.1

BIG-IP GTM: 12.1.0 - 16.0.1

BIG-IP Link Controller: 12.1.0 - 16.0.1

BIG-IP PEM: 12.1.0 - 16.0.1

External links

http://support.f5.com/csp/article/K13323323

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.