Cross-site scripting in BIG-IP Advanced WAF and ASM



Published: 2021-03-11
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-22993
CWE-ID CWE-79
Exploitation vector Network
Public exploit N/A
Vulnerable software
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BIG-IP Advanced WAF
Client/Desktop applications / Antivirus software/Personal firewalls

BIG-IP ASM
Hardware solutions / Security hardware applicances

Vendor F5 Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) DOM-based cross-site scripting

EUVDB-ID: #VU51421

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-22993

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

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 - 16.0.1


CPE2.3 External links

http://support.f5.com/csp/article/K55237223

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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