Vulnerability identifier: #VU83372

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-6209

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers
Firefox ESR
Client/Desktop applications / Web browsers
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to manipulate data on websites.

The vulnerability exists due to insufficient validation of user-supplied input when parsing relative URLs that start with a triple slash, e.g. "///". A remote attacker can use a path-traversal "/../" part in the path to override the specified host.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 100.0 - 119.0.1

Firefox ESR: 115.0 - 115.4.0, 102.0 - 102.15.1

Firefox for Android: 100.1.0 - 119.1.1

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2023-49/
http://www.mozilla.org/en-US/security/advisories/mfsa2023-50/

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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.