Vulnerability identifier: #VU18549

Vulnerability risk: Medium

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

CVE-ID: CVE-2019-9815

CWE-ID: CWE-362

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 compromise vulnerable system.

The vulnerability exists due to enabled hyperthreading in applications running untrusted code in a thread through a new sysctl on macOS. A remote attacker can perform timing attack, similar to previous Spectre attacks and execute arbitrary code on the target system.

The vulnerability affects macOS users.

For this mitigation to take effect, users must install macOS 10.14.5.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 66.0.5

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2019-13/

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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.