#VU23374 Use-after-free in Firefox ESR and Mozilla Firefox - CVE-2019-17010

Vulnerability identifier: #VU23374

Vulnerability risk: High

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-17010

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox ESR
Client/Desktop applications / Web browsers
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 a use-after-free error  when checking the Resist Fingerprinting preference during device orientation checks. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a race condition that will results in a use-after-free error.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox ESR: 60.0 - 60.9.0, 68.0 - 68.2.0

Mozilla Firefox: 66.0.2 - 70.0.1

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2019-36/
https://www.mozilla.org/en-US/security/advisories/mfsa2019-37/

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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.