Vulnerability identifier: #VU10976

Vulnerability risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5133

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

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

Vendor: Mozilla

Description
The vulnerability allows a local attacker to obtain potentially sensitive information on the target system.

The weakness exists due to improper sanitization of HTML and script content. A local attacker can use a specially crafted program to change the app.support.baseURL preference, load chrome://browser/content/preferences/in-content/preferences.xul directly in a tab, bypass security restrictions and execute a search whenever an EME video player plugin displays a CDM-disabled message as a notification message.

Mitigation
Update to version 59.0.

Vulnerable software versions

Mozilla Firefox: 58.0

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2018-06/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.