[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.

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


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

Reference to the upstream fixes (longterm 4.4.19):

patch/?id=72c2d3bccaba4a0a4de354f9d2d24eccd05bfccf (This a follow-up to
"tcp: make challenge acks less predictable)

Correction for Enea Linux

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 >
$ chmod a+x ~/bin/repo

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

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

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