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

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU20824

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-9812

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to escape sandbox restrictions.

The vulnerability exists due to a combination of issues related to a compromised sandboxed content and the Firefox Sync ability to  synchronize data with the malicious account. A remote attacker can can compromise a sandboxed content process using a different vulnerability, and then escape that sandbox by loading accounts.firefox.com in that process and forcing a log-in to a malicious Firefox Sync account. Preference settings that disable the sandbox are then synchronized to the local machine and the compromised browser would restart without the sandbox if a crash is triggered.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox-esr (Alpine package): 60.4.0-r0 - 60.8.0-r0

External links

http://git.alpinelinux.org/aports/commit/?id=e5cf7735a9421cc3029ffa0ffda33135ab64ac6a
http://git.alpinelinux.org/aports/commit/?id=6f6dc3727e020934d6a5a3d10fe2b591bd4c305a
http://git.alpinelinux.org/aports/commit/?id=0022d15ae85827001bd50d87a374fd81eb56167b

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.