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Ubuntu 12.04 LTS USN-2656-2 Critical: Firefox Remote Exploitation

ubuntu
Calendar Grey July 15, 2015
Scroller Ubuntu Esm H88
Several Firefox security flaws in Ubuntu 12.04 LTS may result in crashes and unauthorized code execution. It's advisable to update your system.
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:

USN-2656-1 fixed vulnerabilities in Firefox for Ubuntu 14.04 LTS and

later releases.

This update provides the corresponding update for Ubuntu 12.04 LTS.

Original advisory details:

Karthikeyan Bhargavan discovered that NSS incorrectly handled state

transitions for the TLS state machine. If a remote attacker were able to

perform a man-in-the-middle attack, this flaw could be exploited to skip

the ServerKeyExchange message and remove the forward-secrecy property.

(CVE-2015-2721)

Looben Yan discovered 2 use-after-free issues when using XMLHttpRequest in

some circumstances. 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 execute arbitrary code with

the privileges...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution firefox application crash ubuntu

Update Instructions

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

Ubuntu 12.04 LTS:
  firefox                         39.0+build5-0ubuntu0.12.04.2

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

References

https://ubuntu.com/security/notices/USN-2656-2

https://ubuntu.com/security/notices/USN-2656-1

CVE-2015-2721, CVE-2015-2722, CVE-2015-2724, CVE-2015-2725,

CVE-2015-2726, CVE-2015-2727, CVE-2015-2728, CVE-2015-2729,

CVE-2015-2730, CVE-2015-2731, CVE-2015-2733, CVE-2015-2734,

CVE-2015-2735, CVE-2015-2736, CVE-2015-2737, CVE-2015-2738,

CVE-2015-2739, CVE-2015-2740, CVE-2015-2741, CVE-2015-2743,

CVE-2015-4000

Severity
critical
Lowest
Low
Medium
High
Critical

July 15, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution firefox application crash ubuntu

Package Information

https://launchpad.net/ubuntu/+source/firefox/39.0+build5-0ubuntu0.12.04.2

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