#VU72259 Prototype pollution in Mozilla Firefox - CVE-2023-25731

Vulnerability identifier: #VU72259

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-25731

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to execute arbitrary JavaScrpit code on the target system.

The vulnerability exists due to URL previews in the network panel of developer tools improperly store URLs. A remote attacker can use query parameters to overwrite global objects in privileged code when rendering URLPreview and perform prototype pollution.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 103.0 - 109.0

---

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

---

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.