[security-announce] Security Update: linux-yocto: CVE-2016-5696 *HIGH*

Sona Sarmadi sona.sarmadi at enea.com
Wed Aug 31 13:13:34 CEST 2016


		Enea Linux Security Advisory

====================================================================
Product/package: Enea Linux 6.0: kernel (linux-yocto 4.4)
Severity: High
Architecture: qemuarm, qemuppc, qemux86
CVE Name: CVE-2016-5696
====================================================================

This security update fixes the RFC 5961 challenge ACK rate issue.

Description
===========
net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly
determine the rate of challenge ACK segments, which makes it easier for
man-in-the-middle attackers to hijack TCP sessions via a blind in-window
attack.

References:
===========
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5696
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758

CVE assignement: http://www.openwall.com/lists/oss-security/2016/07/12/2


Reference to the upstream fixes (longterm 4.4.19):
===================================================
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/
patch/?id=5413f1a526d2d51d7a5768133c90936c017165c6

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/
patch/?id=72c2d3bccaba4a0a4de354f9d2d24eccd05bfccf (This a follow-up to
"tcp: make challenge acks less predictable)


Correction for Enea Linux
=========================
http://git.enea.com/cgit/linux/meta-enea-bsp-common.git/patch/?id=bac630923de2f10b62e8f2635f192b7fec8165ba


How to get the latest patches
=============================
- If you have already cloned needed repositories, update it to get new
security patches.

cd Enea-Linux-6.0
$ repo sync

- If you have not yet cloned needed repositories, do it as described
below. (Security patches are fetched implicitly when cloning the repos).

Use repo tool to download the source for Enea Linux, follow the steps below:
1. Make sure that the repo tool is installed. If not, follow the
instructions below:

$ curl https://storage.googleapis.com/git-repo-downloads/repo >
~/bin/repo
$ chmod a+x ~/bin/repo

The instruction assumes that ~/bin exists and is included in the PATH
variable.

2.Use the repo tool to download the source:
$ mkdir Enea-Linux-6.0
$ cd Enea-Linux-6.0
$ repo init \
-u git://git.enea.com/linux/el_manifests-standard.git \
-b krogoth\
-m <manifest file>
$ repo sync

The parameter <manifest file> depends on the target:
P2041RDB: p2041rdb/default.xml
LS1021a-IoT: ls1021aiot/default.xml
QEMUARM: qemuarm/default.xml
QEMUPCC: qemuppc/default.xml
QEMUX86: qemux86/default.xml

If you have any questions regarding the security patches and security
updates please contact security at enea.com.

Enea Security Team
Sona Sarmadi
Mobile: +46 70 971 4475
www.enea.com

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