#VU58614 Input validation error in Firefox for Android - CVE-2021-43544

Vulnerability identifier: #VU58614

Vulnerability risk: Medium

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

CVE-ID: CVE-2021-43544

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input, when receiving a URL through a SEND intent. A  remote attacker can trick the application to search for the specially crafted text, however subsequent usages of the address bar might caused the URL to load unintentionally, leading to XSS or spoofing attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox for Android: 90.1.0 - 94.1.2

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/

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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.