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Vulnerability of Firefox: information disclosure via fetch

Synthesis of the vulnerability 

An attacker can use the fetch() function in a web site, in order to obtain sensitive information belonging to another site.
Impacted products: Fedora, Firefox, openSUSE, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 16/10/2015.
Références of this threat: CERTFR-2015-AVI-432, CVE-2015-7184, FEDORA-2015-444e5d168d, MFSA-2015-115, openSUSE-SU-2015:1817-1, USN-2768-1, VIGILANCE-VUL-18117.

Description of the vulnerability 

The CORS (Cross-Origin Resource Sharing) specification defines rules to share resources between domains, such as fonts.

The function fetch() downloads documents. However, as it does not honor CORS, an attacker can bypass access restrictions to data.

An attacker can therefore use the fetch() function in a web site, in order to obtain sensitive information belonging to another site.
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This computer weakness note impacts software or systems such as Fedora, Firefox, openSUSE, Ubuntu.

Our Vigil@nce team determined that the severity of this security bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this weakness announce.

Solutions for this threat 

Firefox: version 41.0.2.
The version 41.0.2 is fixed:
  https://www.mozilla.org/en-US/firefox/products/

Fedora 22: new firefox packages.
New packages are available:
  Fedora 22: firefox 41.0.2-2.fc22

openSUSE: new MozillaFirefox packages.
New packages are available:
  openSUSE 13.1: MozillaFirefox 41.0.2-91.1
  openSUSE 13.2: MozillaFirefox 41.0.2-47.1

Ubuntu: new firefox packages.
New packages are available:
  Ubuntu 15.04: firefox 41.0.2+build2-0ubuntu0.15.04.1
  Ubuntu 14.04 LTS: firefox 41.0.2+build2-0ubuntu0.14.04.1
  Ubuntu 12.04 LTS: firefox 41.0.2+build2-0ubuntu0.12.04.1
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