#VU51421 DOM-based cross-site scripting in BIG-IP Advanced WAF and BIG-IP ASM - CVE-2021-22993

Vulnerability identifier: #VU51421

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-22993

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP Advanced WAF
Client/Desktop applications / Antivirus software/Personal firewalls
BIG-IP ASM
Hardware solutions / Security hardware applicances

Vendor: F5 Networks

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the BIG-IP ASM DoS Profile properties page. A remote attacker can inject a malicious script into the BIG-IP Advanced WAF and ASM Configuration utility and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIG-IP Advanced WAF: 12.1.0 - 16.0.1

BIG-IP ASM: 12.1.0 HF1 - 16.0.1

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External links
https://support.f5.com/csp/article/K55237223

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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.