Use-after-free in firefox (Alpine package)

1) Use-after-free

EUVDB-ID: #VU26573

Risk: Critical

CVSSv4.0: 8.6 [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:A/U:Red]

CVE-ID: CVE-2020-6819

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 caused by a race condition running the nsDocShell destructor. 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 update from vendor's website.

Vulnerable software versions

firefox (Alpine package): 60.0.1-r0 - 74.0-r3

CPE2.3

• cpe:2.3:a:alpine:firefox_alpine_package:60.0.1-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:firefox_alpine_package:68.0.2-r0:*:*:*:*:alpine_linux:*:3.10
• cpe:2.3:a:alpine:firefox_alpine_package:69.0.3-r0:*:*:*:*:alpine_linux:*:3.10

External links

https://git.alpinelinux.org/aports/commit/?id=174183ffc582462ae8eaf468da032a6642e140c4
https://git.alpinelinux.org/aports/commit/?id=9e2f5a5133c02cac8537d753874de3c9ba0ad559
https://git.alpinelinux.org/aports/commit/?id=643b492b9ed0d04d8f07f23e5271fbe9ea02d717
https://git.alpinelinux.org/aports/commit/?id=0a453dd802559d8cf38ccc05d957a5a0988da323
https://git.alpinelinux.org/aports/commit/?id=fdf87ca78a3e4585581cc08fa370a84c03d17cdc

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?

Yes. This vulnerability is being exploited in the wild.