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Ubuntu Security Notice USN-3918-4

Ubuntu Security Notice USN-3918-4
Posted Apr 17, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3918-4 - USN-3918-1 fixed vulnerabilities in Firefox. The update caused web compatibility and performance issues with some websites. This update fixes the problem. 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 cause a denial of service via application crash, denial of service via successive FTP authorization prompts or modal alerts, trick the user with confusing permission request prompts, obtain sensitive information, conduct social engineering attacks, or execute arbitrary code. A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. If a user were tricked in to opening a specially crafted website with Spectre mitigations disabled, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. It was discovered that Upgrade-Insecure-Requests was incorrectly enforced for same-origin navigation. An attacker could potentially exploit this to conduct man-in-the-middle attacks. Various other issues were also addressed.

tags | advisory, web, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-9791, CVE-2019-9793, CVE-2019-9799, CVE-2019-9803, CVE-2019-9808
MD5 | 84b03fa22a51ba0b63c8c1a390101295

Ubuntu Security Notice USN-3918-4

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3918-4
April 16, 2019

firefox regressions
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-3918-1 caused a regression in Firefox.

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-3918-1 fixed vulnerabilities in Firefox. The update caused web
compatibility and performance issues with some websites. This update fixes
the problem.

We apologize for the inconvenience.

Original advisory 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 cause a denial of service via application
crash, denial of service via successive FTP authorization prompts or modal
alerts, trick the user with confusing permission request prompts, obtain
sensitive information, conduct social engineering attacks, or execute
arbitrary code. (CVE-2019-9788, CVE-2019-9789, CVE-2019-9790,
CVE-2019-9791, CVE-2019-9792, CVE-2019-9795, CVE-2019-9796, CVE-2019-9797,
CVE-2019-9799, CVE-2019-9802, CVE-2019-9805, CVE-2019-9806, CVE-2019-9807,
CVE-2019-9808, CVE-2019-9809)

A mechanism was discovered that removes some bounds checking for string,
array, or typed array accesses if Spectre mitigations have been disabled.
If a user were tricked in to opening a specially crafted website with
Spectre mitigations disabled, an attacker could potentially exploit this
to cause a denial of service, or execute arbitrary code. (CVE-2019-9793)

It was discovered that Upgrade-Insecure-Requests was incorrectly enforced
for same-origin navigation. An attacker could potentially exploit this to
conduct man-in-the-middle (MITM) attacks. (CVE-2019-9803)

Update instructions:

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

Ubuntu 18.10:
firefox 66.0.3+build1-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
firefox 66.0.3+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
firefox 66.0.3+build1-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
firefox 66.0.3+build1-0ubuntu0.14.04.1

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

References:
https://usn.ubuntu.com/usn/usn-3918-4
https://usn.ubuntu.com/usn/usn-3918-1
https://launchpad.net/bugs/1825051

Package Information:

https://launchpad.net/ubuntu/+source/firefox/66.0.3+build1-0ubuntu0.18.10.1

https://launchpad.net/ubuntu/+source/firefox/66.0.3+build1-0ubuntu0.18.04.1

https://launchpad.net/ubuntu/+source/firefox/66.0.3+build1-0ubuntu0.16.04.1

https://launchpad.net/ubuntu/+source/firefox/66.0.3+build1-0ubuntu0.14.04.1

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