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Vulnerability of Linux kernel: memory corruption via ptrace

Synthesis of the vulnerability 

An attacker can write into the Linux kernel memory, in order to trigger a denial of service, and possibly to run code with kernel privileges.
Vulnerable systems: Debian, Fedora, Linux, RHEL.
Severity of this threat: 1/4.
Creation date: 29/07/2014.
Références of this weakness: CERTFR-2014-AVI-332, CVE-2014-3534, DSA-2992-1, FEDORA-2014-9010, FEDORA-2014-9142, MDVSA-2014:201, RHSA-2014:1023-01, VIGILANCE-VUL-15104.

Description of the vulnerability 

The ptrace system call is used by debuggers to control the traced process.

The command PTRACE_POKEUSR_AREA of the ptrace system call is used to write to the memory of the traced process. However, on s390 architectures, the address translation mode is not correctly checked in the kernel function __poke_user of the source file "arch/s390/kernel/ptrace.c". This allows the caller process to bypass restrictions about the reachable address space and so writing to the kernel memory.

An attacker can therefore write into the Linux kernel memory, in order to trigger a denial of service, and possibly to run code with kernel privileges.
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This cybersecurity note impacts software or systems such as Debian, Fedora, Linux, RHEL.

Our Vigil@nce team determined that the severity of this computer weakness announce 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 cybersecurity vulnerability.

Solutions for this threat 

Linux kernel: version 3.15.8.
The version 3.15.8 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.15.8.tar.xz

Linux kernel: version 3.14.15.
The version 3.14.15 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.14.15.tar.xz

Linux kernel: version 3.12.27.
The version 3.12.27 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.10.51.
The version 3.10.51 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.10.51.tar.xz

Linux kernel: version 3.4.101.
The version 3.4.101 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.4.101.tar.xz

Linux kernel: version 3.2.62.
The version 3.2.62 is fixed:
  https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.2.62.tar.xz

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

Debian: new linux packages.
New packages are available:
  Debian 7: linux 3.2.60-1+deb7u3

Fedora 19: new kernel packages.
New packages are available:
  Fedora 19: kernel 3.14.15-100.fc19

Fedora 20: new kernel packages.
New packages are available:
  Fedora 20: kernel 3.15.7-200.fc20

Mandriva: new kernel packages.
New packages are available:
  Mandriva BS1: kernel-source 3.4.104-1.mbs1

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7: kernel 3.10.0-123.6.3.el7
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