Input validation error in BIG-IP ASM and BIG-IP Advanced WAF - CVE-2020-27728
Published: December 17, 2020
Vulnerability identifier: #VU49084
CSH Severity: 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-2020-27728
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
BIG-IP ASM
BIG-IP Advanced WAF
BIG-IP ASM
BIG-IP Advanced WAF
Software vendor:
F5 Networks
F5 Networks
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.
Remediation
Install updates from vendor's website.