Denial of service in BIG-IP AVRD



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-27728
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 BIG-IP ASM
Hardware solutions / Security hardware applicances

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) Input validation error

EUVDB-ID: #VU49084

Risk: Medium

CVSSv4.0: 4.6 [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-2020-27728

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input. Under certain conditions, Analytics, Visibility, and Reporting daemon (AVRD) may generate a core file and restart on the BIG-IP system when processing requests sent from mobile devices. A remote attacker can initiate a denial-of-service (DoS) attack on the AVRD process on the BIG-IP system from a mobile device.

This vulnerability occurs when all of the following conditions are met:

  • Mobile SDK is licensed and enabled.
  • An app using Mobile SDK on certain mobile devices sends a request to a virtual server with a Bot Defense profile.
  • The AVRD process sends the statistics to a BIG-IQ system or any external log server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP ASM: 14.1.0 - 16.0.0

BIG-IP Advanced WAF: 14.1.0 - 16.0.0

CPE2.3 External links

https://support.f5.com/csp/article/K45143221


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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