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Ubuntu: 3076-1 Critical: Firefox Memory Flaws Denial of Service

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Calendar Grey September 22, 2016
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Ubuntu Security Notice USN-5078-1 highlights severe vulnerabilities in Thunderbird that may lead to application failures or unauthorized code execution.
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:

Atte Kettunen discovered an out-of-bounds read when handling certain

Content Security Policy (CSP) directives 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. (CVE-2016-2827)

Christoph Diehl, Christian Holler, Gary Kwong, Nathan Froyd, Honza Bambas,

Seth Fowler, Michael Smith, Andrew McCreight, Dan Minor, Byron Campen, Jon

Coppeard, Steve Fink, Tyson Smith, and Carsten Book discovered multiple

memory safety issues 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 via application crash, or execute arbitrary

code. (CVE-2016-5256, CVE-2016-5257)

Atte Kettunen ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service arbitrary code execution firefox application crash ubuntu memory safety

Update Instructions

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

Ubuntu 16.04 LTS:
  firefox                         49.0+build4-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  firefox                         49.0+build4-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  firefox                         49.0+build4-0ubuntu0.12.04.1

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

References

https://ubuntu.com/security/notices/USN-3076-1

CVE-2016-2827, CVE-2016-5256, CVE-2016-5257, CVE-2016-5270,

CVE-2016-5271, CVE-2016-5272, CVE-2016-5273, CVE-2016-5274,

CVE-2016-5275, CVE-2016-5276, CVE-2016-5277, CVE-2016-5278,

CVE-2016-5279, CVE-2016-5280, CVE-2016-5281, CVE-2016-5282,

CVE-2016-5283, CVE-2016-5284

Severity
critical
Lowest
Low
Medium
High
Critical

September 22, 2016

Topics%20covered

Topics Covered

security advisory denial of service arbitrary code execution firefox application crash ubuntu memory safety

Package Information

https://launchpad.net/ubuntu/+source/firefox/49.0+build4-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/firefox/49.0+build4-0ubuntu0.14.04.1
https://launchpad.net/ubuntu/+source/firefox/49.0+build4-0ubuntu0.12.04.1

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