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weakness note CVE-2014-3952

FreeBSD: information disclosure via Control Message

Synthesis of the vulnerability

A local attacker can read a memory fragment via a Control Message of FreeBSD, in order to obtain sensitive information.
Severity of this announce: 1/4.
Creation date: 09/07/2014.
Références of this computer vulnerability: CVE-2014-3952, DSA-3070-1, FreeBSD-SA-14:17.kmem, VIGILANCE-VUL-15013.
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Description of the vulnerability

The recvmsg() system call returns to the user a network message.

However, the sbcreatecontrol() function of the sys/kern/uipc_sockbuf.c file does not initialize a memory area before returning it to the user.

A local attacker can therefore read a memory fragment via a Control Message of FreeBSD, in order to obtain sensitive information.
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This threat note impacts software or systems such as Debian, FreeBSD.

Our Vigil@nce team determined that the severity of this cybersecurity note is low.

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 vulnerability note.

Solutions for this threat

FreeBSD: patch for kmem.
A patch is available:
  http://security.FreeBSD.org/patches/SA-14:17/kmem.patch
  http://security.FreeBSD.org/patches/SA-14:17/kmem-9.1.patch
  http://security.FreeBSD.org/patches/SA-14:17/kmem-89.patch

Debian: new kfreebsd-9 packages.
New packages are available:
  Debian 7: kfreebsd-9 9.0-10+deb70.8
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