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Ubuntu 18.04: USN-3778-1 Critical Firefox Crash and Remote Exploit

ubuntu
Calendar Grey October 3, 2018
Dist Ubuntu Esm H88
Upgrade Ubuntu to resolve security flaws in Firefox that could lead to crashes, unauthorized execution, or various forms of exploitation.
Firefox could be made to crash or run programs as your login if it opened a malicious website.

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:

A crash was discovered in TransportSecurityInfo used for SSL, which could

be triggered by data stored in the local cache directory. An attacker

could potentially exploit this in combination with another vulnerability

that allowed them to write data to the cache, to execute arbitrary code.

(CVE-2018-12385)

A type confusion bug was discovered in JavaScript. If a user were tricked

in to opening a specially crafted website, an attacker could exploit this

to cause a denial of service, or execute arbitrary code. (CVE-2018-12386)

It was discovered that the Array.prototype.push could leak memory

addresses to the calling function in some circumstances. An attacker could

exploit this in combination with another vulnerability to help execute

arbitrary code. (CVE-2018-12387)

Topics%20covered

Topics Covered

security advisory remote exploit critical code execution DoS Ubuntu Firefox

Update Instructions

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

Ubuntu 18.04 LTS:
  firefox                         62.0.3+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  firefox                         62.0.3+build1-0ubuntu0.16.04.2

Ubuntu 14.04 LTS:
  firefox                         62.0.3+build1-0ubuntu0.14.04.2

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

References

https://ubuntu.com/security/notices/USN-3778-1

CVE-2018-12385, CVE-2018-12386, CVE-2018-12387

Severity
critical
Lowest
Low
Medium
High
Critical

October 03, 2018

Topics%20covered

Topics Covered

security advisory remote exploit critical code execution DoS Ubuntu Firefox

Package Information

https://launchpad.net/ubuntu/+source/firefox/62.0.3+build1-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/firefox/62.0.3+build1-0ubuntu0.16.04.2
https://launchpad.net/ubuntu/+source/firefox/62.0.3+build1-0ubuntu0.14.04.2

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