Vulnerability identifier: #VU72255

Vulnerability risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-25729

CWE-ID: CWE-357

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to missing permissions prompts for opening external schemes were only shown for ContentPrincipals. A malicious extension can open external schemes without user interaction via ExpandedPrincipals and perform other potentially dangerous actions, such as downloading files or interacting with software already installed on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 109.0.1

Firefox ESR: 102.0 - 102.7.0

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2023-05/
http://www.mozilla.org/en-US/security/advisories/mfsa2023-06/

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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.