Denial of service in Virtual Server implementation on some BIG-IP systems

1) Memory leak

EUVDB-ID: #VU49042

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-2020-5883

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak when processing POST requests on HTTP Explicit Proxy Virtual Server with configured HTTP_PROXY_REQUEST iRule. A remote attacker can send a specially crafted HTTP request to the virtual server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP AAM: 13.1.0 - 15.0.1.0.48.11 ENG Hotfix

BIG-IP AFM: 13.1.0 - 15.0.1.0.48.11 ENG Hotfix

BIG-IP APM: 13.1.0 - 15.0.1.0.48.11 ENG Hotfix

BIG-IP ASM: 13.1.0 - 15.0.1.0.48.11 ENG Hotfix

BIG-IP Edge Gateway: 13.1.0 - 15.0.1

BIG-IP FPS: 13.1.0 - 15.0.1.0.48.11 ENG Hotfix

BIG-IP LTM: 13.1.0 - 15.0.1.0.48.11-ENG Hotfix

BIG-IP Link Controller: 13.1.0 - 15.0.1.0.48.11-ENG Hotfix

BIG-IP PEM: 13.1.0 - 15.0.1.0.48.11-ENG Hotfix

BIG-IP WebAccelerator: 13.1.0 - 15.0.1

External links

http://support.f5.com/csp/article/K12234501

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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