Vulnerability identifier: #VU621

Vulnerability risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-5283

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description
The vulnerability allows a remote user to obtain potentially sensitive information on the target system.
The weakness is caused by timing attack performing. A cross-origin 'iframe src' tag fragment timing attack may reveal private data using document resizes and link colors.
Successful exploitation of the vulnerability results in disclose potentially sensitive data on the vulnerable system.

Mitigation
Update to 49.0.

Vulnerable software versions

Mozilla Firefox: 3.5 - 48.0.2

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2016-85/

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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.