#VU27537 Spoofing attack in Mozilla Firefox - CVE-2020-12394

Vulnerability identifier: #VU27537

Vulnerability risk: Low

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

CVE-ID: CVE-2020-12394

CWE-ID: CWE-451

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description

The vulnerability allows a local user to perform spoofing attack.

The vulnerability exists due to a logic flaw in the location bar implementation. A local user can spoof  the current location by selecting a different origin and removing focus from the input element.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 70.0 - 75.0

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/
https://bugzilla.mozilla.org/show_bug.cgi?id=1628288

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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