#VU55851 Improper Restriction of Rendered UI Layers or Frames in F-Secure Safe Browser - CVE-2021-33596

Vulnerability identifier: #VU55851

Vulnerability risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-33596

CWE-ID: CWE-1021

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
F-Secure Safe Browser
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: F-Secure

Description

The vulnerability allows a remot attacker to compromise the target system.

The vulnerability exists due to showing the legitimate URL in the address bar while loading the content from other domain. A remote authenticated attacker can trick a victim to click on a specially crafted URL and make the user believe that the content is served by a legit domain .

Mitigation
Install updates from vendor's website.

Vulnerable software versions

F-Secure Safe Browser: 18.3.0

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External links
https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame
https://www.f-secure.com/en/business/support-and-downloads/security-advisories
https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33596

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.