#VU60405 Improper Authorization in Handler for Custom URL Scheme in Firefox for Android - CVE-2022-22758

Vulnerability identifier: #VU60405

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-2022-22758

CWE-ID: CWE-939

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 force the victim to make unwanted phone calls.

The vulnerability exists in the way tel: link are handled. When clicking on a tel: link, USSD codes, specified after a certain character is included in the phone number. On certain phones, or on certain carriers, if the number was dialed this could perform actions on a user's account, similar to a cross-site request forgery attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox for Android: 90.1.0 - 96.3.0

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2022-04/

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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.