7.5 - USN-3596-1

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

- Ubuntu 17.10 - Ubuntu 16.04 LTS - Ubuntu 14.04 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 cause a denial of service via application crash or opening new tabs, escape the sandbox, bypass same-origin restrictions, obtain sensitive information, confuse the user with misleading permission requests, or execute arbitrary code. (CVE-2018-5125, CVE-2018-5126, CVE-2018-5127, CVE-2018-5128, CVE-2018-5129, CVE-2018-5130, CVE-2018-5136, CVE-2018-5137, CVE-2018-5140, CVE-2018-5141, CVE-2018-5142)

It was discovered that the fetch() API could incorrectly return cached copies of no-store/no-cache resources in some circumstances. A local attacker could potentially exploit this to obtain sensitive information in environments where multiple users share a common profile. (CVE-2018-5131)

Multiple security issues were discovered with WebExtensions. If a user were tricked in to installing a specially crafted extension, an attacker could potentially exploit these to obtain sensitive information or bypass security restrictions. (CVE-2018-5132, CVE-2018-5134, CVE-2018-5135)

It was discovered that the value of app.support.baseURL is not sanitized properly. If a malicious local application were to set this to a specially crafted value, an attacker could potentially exploit this to execute arbitrary code. (CVE-2018-5133)

It was discovered that javascript: URLs with embedded tab characters could be pasted in to the addressbar. If a user were tricked in to copying a specially crafted URL in to the addressbar, an attacker could exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2018-5143)

Update instructions:

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

Ubuntu 17.10:
firefox 59.0+build5-0ubuntu0.17.10.1

Ubuntu 16.04 LTS:
firefox 59.0+build5-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
firefox 59.0+build5-0ubuntu0.14.04.1

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

References:
https://usn.ubuntu.com/usn/usn-3596-1
CVE-2018-5125, CVE-2018-5126, CVE-2018-5127, CVE-2018-5128,
CVE-2018-5129, CVE-2018-5130, CVE-2018-5131, CVE-2018-5132,
CVE-2018-5133, CVE-2018-5134, CVE-2018-5135, CVE-2018-5136,
CVE-2018-5137, CVE-2018-5140, CVE-2018-5141, CVE-2018-5142,
CVE-2018-5143

Package Information:
https://launchpad.net/ubuntu/+source/firefox/59.0+build5-0ubuntu0.17.10.1
https://launchpad.net/ubuntu/+source/firefox/59.0+build5-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/firefox/59.0+build5-0ubuntu0.14.04.1