Use-after-free in firefox (Alpine package)

1) Use-after-free

EUVDB-ID: #VU29458

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-12416

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in WebRTC VideoBroadcaster. A VideoStreamEncoder may have been freed in a race condition with VideoBroadcaster::AddOrUpdateSink, resulting in a use-after-free.

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

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox (Alpine package): 70.0-r0 - 77.0.1-r4

CPE2.3

• cpe:2.3:a:alpine:firefox_alpine_package:70.0-r0:*:*:*:*:alpine_linux:*:3.10
• cpe:2.3:a:alpine:firefox_alpine_package:70.0-r1:*:*:*:*:alpine_linux:*:3.10
• cpe:2.3:a:alpine:firefox_alpine_package:70.0.1-r0:*:*:*:*:alpine_linux:*:3.10

External links

https://git.alpinelinux.org/aports/commit/?id=02f4c40162bc3c2f611ce86613bbf01f13e6146b
https://git.alpinelinux.org/aports/commit/?id=7ece421265010e81e06c3b8b9137b0b62f7acc73

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.