#VU26574 Use-after-free


Published: 2020-04-03 | Updated: 2020-04-07

Vulnerability identifier: #VU26574

Vulnerability risk: Critical

CVSSv3.1:

CVE-ID: CVE-2020-6820

CWE-ID: CWE-416

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 compromise vulnerable system.

The vulnerability exists due to a use-after-free error caused by a race condition handling ReadableStream. A remote attacker can create a specially crafted website, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the system.

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

Note, this vulnerability is being actively exploited in the wild in targeted attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 60.0 - 74.0

Firefox ESR: 68.0 - 68.6.0, 60.0 - 60.9.0


CPE

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-11/
http://bugzilla.mozilla.org/show_bug.cgi?id=1626728


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?


Latest bulletins with this vulnerability