[USN-4122-1] Firefox vulnerabilities

Chris Coulson chris.coulson at canonical.com
Wed Sep 4 21:30:32 UTC 2019

Ubuntu Security Notice USN-4122-1
September 04, 2019

firefox vulnerabilities

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS


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


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.

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.

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.

  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,

Package Information:

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