Insufficient Session Expiration in BIG-IP Advanced WAF and BIG-IP ASM - #VU52754
Published: April 29, 2021
Vulnerability identifier: #VU52754
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-613
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
BIG-IP Advanced WAF
BIG-IP ASM
BIG-IP Advanced WAF
BIG-IP ASM
Software vendor:
F5 Networks
F5 Networks
Description
The vulnerability allows an attacker to gain unauthorized access to the system.
The vulnerability exists due to insufficient session expiration issue, as the Advanced WAF and BIG-IP ASM systems may not properly support the Post-Redirect-Get (PRG) application flow implemented on a back-end web server. After users log out of an application or site, they may log in again by clicking the browser Back button a multiple times.
This issue occurs when all of the following conditions are met:
- You enabled brute force protection in your security policy.
- You configure your security policy to use Client Side Integrity (CSI) or CAPTCHA challenge for brute force protection.
- You associated the security policy with the virtual server to protect the back-end web server with the PRG application flow.
Remediation
Install updates from vendor's website.