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Ubuntu Security Notice USN-3874-1

Ubuntu Security Notice USN-3874-1
Posted Jan 31, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3874-1 - 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, gain additional privileges by escaping the sandbox, or execute arbitrary code. It was discovered that Firefox allowed PAC files to specify that requests to localhost are sent through the proxy to another server. If proxy auto-detection is enabled, an attacker could potentially exploit this to conduct attacks on local services and tools. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2018-18500, CVE-2018-18504, CVE-2018-18505, CVE-2018-18506
MD5 | 0610de62126292ee797c34a48f213f8a

Ubuntu Security Notice USN-3874-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3874-1
January 30, 2019

firefox vulnerabilities
==========================================================================

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:

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, gain additional
privileges by escaping the sandbox, or execute arbitrary code.
(CVE-2018-18500, CVE-2018-18501, CVE-2018-18502, CVE-2018-18503,
CVE-2018-18504, CVE-2018-18505)

It was discovered that Firefox allowed PAC files to specify that requests
to localhost are sent through the proxy to another server. If proxy
auto-detection is enabled, an attacker could potentially exploit this to
conduct attacks on local services and tools. (CVE-2018-18506)

Update instructions:

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

Ubuntu 18.10:
firefox 65.0+build2-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
firefox 65.0+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
firefox 65.0+build2-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
firefox 65.0+build2-0ubuntu0.14.04.1

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

References:
https://usn.ubuntu.com/usn/usn-3874-1
CVE-2018-18500, CVE-2018-18501, CVE-2018-18502, CVE-2018-18503,
CVE-2018-18504, CVE-2018-18505, CVE-2018-18506

Package Information:
https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.18.10.1
https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/firefox/65.0+build2-0ubuntu0.14.04.1
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