N/A - USN-4122-1

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS

Summary:

Firefox could be made to crash or run programs as your login if it opened a malicious website.

Software Description: - firefox: Mozilla Open Source web browser

Details:

Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to obtain sensitive information, bypass Content Security Policy (CSP) protections, bypass same-origin restrictions, conduct cross-site scripting (XSS) attacks, cause a denial of service, or execute arbitrary code. (CVE-2019-5849, CVE-2019-11734, CVE-2019-11735, CVE-2019-11737, CVE-2019-11738, CVE-2019-11740, CVE-2019-11742, CVE-2019-11743, CVE-2019-11744, CVE-2019-11746, CVE-2019-11748, CVE-2019-11749, CVE-2019-11750, CVE-2019-11752)

It was discovered that a compromised content process could log in to a malicious Firefox Sync account. An attacker could potentially exploit this, in combination with another vulnerability, to disable the sandbox. (CVE-2019-9812)

It was discovered that addons.mozilla.org and accounts.firefox.com could be loaded in to the same content process. An attacker could potentially exploit this, in combination with another vulnerability that allowed a cross-site scripting (XSS) attack, to modify browser settings. (CVE-2019-11741)

It was discovered that the "Forget about this site" feature in the history pane removes HTTP Strict Transport Security (HSTS) settings for sites on the pre-load list. An attacker could potentially exploit this to bypass the protections offered by HSTS. (CVE-2019-11747)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.04:
firefox 69.0+build2-0ubuntu0.19.04.1

Ubuntu 18.04 LTS:
firefox 69.0+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
firefox 69.0+build2-0ubuntu0.16.04.4

After a standard system update you need to restart Firefox to make all the necessary changes.

References:
https://usn.ubuntu.com/4122-1
CVE-2019-11734, CVE-2019-11735, CVE-2019-11737, CVE-2019-11738,
CVE-2019-11740, CVE-2019-11741, CVE-2019-11742, CVE-2019-11743,
CVE-2019-11744, CVE-2019-11746, CVE-2019-11747, CVE-2019-11748,
CVE-2019-11749, CVE-2019-11750, CVE-2019-11752, CVE-2019-5849,
CVE-2019-9812

Package Information:
https://launchpad.net/ubuntu/+source/firefox/69.0+build2-0ubuntu0.19.04.1
https://launchpad.net/ubuntu/+source/firefox/69.0+build2-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/firefox/69.0+build2-0ubuntu0.16.04.4