Vulnerability identifier: #VU9317

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7830

CWE-ID: CWE-346

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to an error when processing cross-origin iframes in the Resource Timing API. A remote attacker can gain access to data, related to another URL. 

Mitigation
Update to version Firefox 57 or Firefox ESR 52.5.

Vulnerable software versions

Mozilla Firefox: 53.0 - 56.0.1

Firefox ESR: 52.0 - 52.4.0

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2017-24/ 
http://www.mozilla.org/en-US/security/advisories/mfsa2017-25/

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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.