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Ubuntu 15.04 LTS USN-2723-1 Critical: Firefox Execution Flaws

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Calendar Grey August 27, 2015
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Security flaws in Firefox may result in system errors or enable malicious actors to execute harmful applications. It is essential for Ubuntu users to apply the latest updates.
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 use-after-free was discovered when resizing a canvas element during

restyling in some circumstances. If a user were tricked in to opening a

specially crafted website, an attacker could potentially exploit this to

cause a denial of service via application crash, or execute arbitrary code

with the privileges of the user invoking Firefox. (CVE-2015-4497)

Bas Venis discovered that the addon install permission prompt could be

bypassed using data: URLs in some circumstances. It was also discovered

that the installation notification could be made to appear over another

site. If a user were tricked in to opening a specially crafted website, an

attacker could potentially exploit this to install a malicious addon.

(CVE-2015-4498)

Topics%20covered

Topics Covered

security advisory denial of service update critical Ubuntu firefox execution flaw

Update Instructions

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

Ubuntu 15.04:
  firefox                         40.0.3+build1-0ubuntu0.15.04.1

Ubuntu 14.04 LTS:
  firefox                         40.0.3+build1-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  firefox                         40.0.3+build1-0ubuntu0.12.04.1

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

References

https://ubuntu.com/security/notices/USN-2723-1

CVE-2015-4497, CVE-2015-4498

Severity
critical
Lowest
Low
Medium
High
Critical

August 27, 2015

Topics%20covered

Topics Covered

security advisory denial of service update critical Ubuntu firefox execution flaw

Package Information

https://launchpad.net/ubuntu/+source/firefox/40.0.3+build1-0ubuntu0.15.04.1
https://launchpad.net/ubuntu/+source/firefox/40.0.3+build1-0ubuntu0.14.04.1
https://launchpad.net/ubuntu/+source/firefox/40.0.3+build1-0ubuntu0.12.04.1

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