Ubuntu update for Firefox

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU18860

Risk: High

CVSSv3.1: 7.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2019-11708

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 to insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes. A remote attacker can create a specially crafted web page that can make the non-sandboxed parent process open web content chosen by a compromised child process.

An attacker can combine this behavior along with another vulnerability to execute arbitrary code on the system with privileges on the current user. 

Note, this vulnerability is being exploited in the wild along with SB2019061805 (CVE-2019-11707)

Mitigation

Update the affected packages.

Ubuntu 19.04

firefox - 67.0.4+build1-0ubuntu0.19.04.1

Ubuntu 18.10

firefox - 67.0.4+build1-0ubuntu0.18.10.1

Ubuntu 18.04 LTS

firefox - 67.0.4+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS

firefox - 67.0.4+build1-0ubuntu0.16.04.1

Vulnerable software versions

firefox (Ubuntu package): 47.0+build3-0ubuntu0.16.04.1 - 67.0.3+build1-0ubuntu0.19.04.1

External links

http://usn.ubuntu.com/4032-1/

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.