N/A - USN-3477-1

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

- Ubuntu 17.10 - Ubuntu 17.04 - 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, read uninitialized memory, obtain sensitive information, bypass same-origin restrictions, bypass CSP protections, bypass mixed content blocking, spoof the addressbar, or execute arbitrary code. (CVE-2017-7826, CVE-2017-7827, CVE-2017-7828, CVE-2017-7830, CVE-2017-7831, CVE-2017-7832, CVE-2017-7833, CVE-2017-7834, CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7842)

It was discovered that javascript: URLs pasted in to the addressbar would be executed instead of being blocked in some circumstances. If a user were tricked in to copying a specially crafted URL in to the addressbar, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7839)

It was discovered that exported bookmarks do not strip script elements from user-supplied tags. If a user were tricked in to adding specially crafted tags to bookmarks, exporting them and then opening the resulting HTML file, an attacker could potentially exploit this to conduct cross-site scripting (XSS) attacks. (CVE-2017-7840)

Update instructions:

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

Ubuntu 17.10:
firefox 57.0+build4-0ubuntu0.17.10.5

Ubuntu 17.04:
firefox 57.0+build4-0ubuntu0.17.04.5

Ubuntu 16.04 LTS:
firefox 57.0+build4-0ubuntu0.16.04.5

Ubuntu 14.04 LTS:
firefox 57.0+build4-0ubuntu0.14.04.4

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

References:
https://www.ubuntu.com/usn/usn-3477-1
CVE-2017-7826, CVE-2017-7827, CVE-2017-7828, CVE-2017-7830,
CVE-2017-7831, CVE-2017-7832, CVE-2017-7833, CVE-2017-7834,
CVE-2017-7835, CVE-2017-7837, CVE-2017-7838, CVE-2017-7839,
CVE-2017-7840, CVE-2017-7842

Package Information:
https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.17.10.5
https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.17.04.5
https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.16.04.5
https://launchpad.net/ubuntu/+source/firefox/57.0+build4-0ubuntu0.14.04.4