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Ubuntu Security Notice USN-2458-3
January 27, 2015

firefox regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

USN-2458-1 introduced a regression in Firefox

Software Description:
- firefox: Mozilla Open Source web browser

Details:

USN-2458-1 fixed vulnerabilities in Firefox. This update introduced a
regression which could make websites that use CSP fail to load under some
circumstances. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Christian Holler, Patrick McManus, Christoph Diehl, Gary Kwong, Jesse
 Ruderman, Byron Campen, Terrence Cole, and Nils Ohlmeier 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 with the privileges of the user invoking Firefox.
 (CVE-2014-8634, CVE-2014-8635)
 
 Bobby Holley discovered that some DOM objects with certain properties
 can bypass XrayWrappers in some circumstances. If a user were tricked in
 to opening a specially crafted website, an attacker could potentially
 exploit this to bypass security restrictions. (CVE-2014-8636)
 
 Michal Zalewski discovered a use of uninitialized memory when rendering
 malformed bitmap images on a canvas element. If a user were tricked in to
 opening a specially crafted website, an attacker could potentially
 exploit this to steal confidential information. (CVE-2014-8637)
 
 Muneaki Nishimura discovered that requests from navigator.sendBeacon()
 lack an origin header. If a user were tricked in to opening a specially
 crafted website, an attacker could potentially exploit this to conduct
 cross-site request forgery (XSRF) attacks. (CVE-2014-8638)
 
 Xiaofeng Zheng discovered that a web proxy returning a 407 response
 could inject cookies in to the originally requested domain. If a user
 connected to a malicious web proxy, an attacker could potentially exploit
 this to conduct session-fixation attacks. (CVE-2014-8639)
 
 Holger Fuhrmannek discovered a crash in Web Audio while manipulating
 timelines. If a user were tricked in to opening a specially crafted
 website, an attacker could potentially exploit this to cause a denial
 of service. (CVE-2014-8640)
 
 Mitchell Harper discovered a use-after-free in WebRTC. 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-2014-8641)
 
 Brian Smith discovered that OCSP responses would fail to verify if signed
 by a delegated OCSP responder certificate with the id-pkix-ocsp-nocheck
 extension, potentially allowing a user to connect to a site with a revoked
 certificate. (CVE-2014-8642)

Update instructions:

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

Ubuntu 14.10:
  firefox                         35.0.1+build1-0ubuntu0.14.10.1

Ubuntu 14.04 LTS:
  firefox                         35.0.1+build1-0ubuntu0.14.04.1

Ubuntu 12.04 LTS:
  firefox                         35.0.1+build1-0ubuntu0.12.04.1

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

Package Information:
  https://launchpad.net/ubuntu/+source/firefox/35.0.1+build1-0ubuntu0.14.10.1
  https://launchpad.net/ubuntu/+source/firefox/35.0.1+build1-0ubuntu0.14.04.1
  https://launchpad.net/ubuntu/+source/firefox/35.0.1+build1-0ubuntu0.12.04.1