#VU27534 Permissions, Privileges, and Access Controls


Published: 2020-05-05

Vulnerability identifier: #VU27534

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-2020-12391

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 implemented security restrictions.

The vulnerability exists due to documents formed using data: URLs in an object element failed to inherit the CSP of the creating context. A remote attacker can execute arbitrary scripts that should have been blocked, albeit with a unique opaque origin.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 75.0


CPE

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-16/
http://bugzilla.mozilla.org/show_bug.cgi?id=1457100


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.


Latest bulletins with this vulnerability