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computer threat announce CVE-2014-4014

Linux kernel: privilege escalation via inode_capable

Synthesis of the vulnerability

A local attacker can manipulate files on Linux, in order to escalate his privileges.
Severity of this weakness: 2/4.
Creation date: 11/06/2014.
Revision date: 18/06/2014.
Références of this bulletin: CERTFR-2014-AVI-325, CERTFR-2014-AVI-373, CVE-2014-4014, FEDORA-2014-7426, FEDORA-2014-7430, openSUSE-SU-2014:0957-1, openSUSE-SU-2014:0985-1, USN-2285-1, USN-2286-1, USN-2287-1, USN-2289-1, USN-2336-1, USN-2337-1, VIGILANCE-VUL-14880.
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Description of the vulnerability

An inode is used to identify a file.

However, the inode_capable() function does not perform the expected checks on the file group in a namespace.

A local attacker can therefore manipulate files on Linux, in order to escalate his privileges.
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This computer vulnerability impacts software or systems such as Fedora, Android OS, Linux, openSUSE, Ubuntu.

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

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this weakness.

Solutions for this threat

Linux kernel: version 3.15.1.
The version 3.15.1 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.14.8.
The version 3.14.8 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.12.23.
The version 3.12.23 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.10.44.
The version 3.10.44 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for inode_capable.
A patch is available in information sources.

Android OS: patch of 2016-12-05.
A patch is indicated in information sources.

Fedora 19: new kernel packages.
New packages are available:
  Fedora 19: kernel 3.14.8-100.fc19

Fedora 20: new kernel packages.
New packages are available:
  Fedora 20: kernel 3.14.8-200.fc20

openSUSE 12.3: new kernel packages (04/08/2014 ).
New packages are available:
  openSUSE 12.3: kernel 3.7.10-1.40.1

openSUSE 13.1: new kernel packages (11/08/2014).
New packages are available:
  openSUSE 13.1: kernel-vanilla 3.11.10-21.1, xen 4.3.2_01-21.1

Ubuntu 12.04 LTS: new linux-image-3.11.0-26-generic packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.11.0-26-generic 3.11.0-26.45~precise1

Ubuntu 12.04 LTS: new linux-image-3.5.0-54-generic packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.5.0-54-generic 3.5.0-54.81~precise1

Ubuntu 12.04 LTS: new linux-image-3.8.0-44-generic packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.8.0-44-generic 3.8.0-44.66~precise1

Ubuntu 12.04: new linux-image-3.13.0-35-generic packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.13.0-35-generic 3.13.0-35.62~precise1

Ubuntu 13.10: new linux-image-3.11.0-26-generic packages.
New packages are available:
  Ubuntu 13.10: linux-image-3.11.0-26-generic 3.11.0-26.45

Ubuntu 14.04: new linux-image-3.13.0-35-generic packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image-3.13.0-35-generic 3.13.0-35.62
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