Vulnerability identifier: #VU12564

Vulnerability risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5175

CWE-ID: CWE-264

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 bypass security restrictions on the target system.

The vulnerability exists due to improper security mechanism of Content Security Policy (CSP) protections on sites that have a script-src policy of 'strict-dynamic'. A remote attacker can inject a reference to a copy of the require.js library that is part of Firefox’s Developer Tools and bypass Content Security Policy (CSP) protections for sites that have a script-src policy of 'strict-dynamic'.

Mitigation
Update to version 60.0.

Vulnerable software versions

Mozilla Firefox: 59.0 - 59.0.2

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2018-11/

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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.