Permissions, Privileges, and Access Controls in firefox-esr (Alpine package)

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU27530

Risk: High

CVSSv4.0: 7.3 [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:P/U:Amber]

CVE-ID: CVE-2020-12388

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to bypass sandbox restrictions.

The vulnerability exists due the Firefox content processes did not sufficiently lockdown access control due to improper protection of access tokens. A remote attacker can bypass implemented security restrictions and execute arbitrary code on the target system.

Note, this vulnerability affects Windows versions only.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox-esr (Alpine package): 60.4.0-r0 - 68.8.0-r0

CPE2.3

• cpe:2.3:a:alpine:firefox-esr_alpine_package:60.4.0-r0:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:firefox-esr_alpine_package:60.4.0-r1:*:*:*:*:alpine_linux:*:3.8
• cpe:2.3:a:alpine:firefox-esr_alpine_package:60.5.0-r0:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=37e37d549603b29c55fafcde8f3732cfb9db1640
https://git.alpinelinux.org/aports/commit/?id=5d9ca1b5fa041ac0d09e2bd2038f505e06c7d7f5
https://git.alpinelinux.org/aports/commit/?id=397c40a2e03948882e67f7fb7053d46e6dda50d3
https://git.alpinelinux.org/aports/commit/?id=4b76c8208fa0c29e289d14baf509b417f7c96a08
https://git.alpinelinux.org/aports/commit/?id=c9413fd0912a1f1e6cdc9e5fd25d15f4f22cc11a
https://git.alpinelinux.org/aports/commit/?id=1aeb9d76f321c652de13c181f2775af18eb8c42d

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. However, proof of concept for this vulnerability is available.