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Red Hat Security Advisory 2017-0123-01

Red Hat Security Advisory 2017-0123-01
Posted Jan 18, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-0123-01 - Docker is an open-source engine that automates the deployment of any application as a lightweight, portable, and self-sufficient container that will run virtually anywhere. The following packages have been upgraded to a newer upstream version: docker-latest. Security Fix: The runc component used by `docker exec` feature of docker allowed additional container processes via to be ptraced by the pid 1 of the container. This allows the main processes of the container, if running as root, to gain low-level access to these new processes during initialization. An attacker can, depending on the nature of the incoming process, leverage this to elevate access to the host. This ranges from accessing host content through the file descriptors of the incoming process to, potentially, a complete container escape by leveraging memory access or syscall interception.

tags | advisory, root
systems | linux, redhat
advisories | CVE-2016-9962
MD5 | a0d2e3dca84efdc23243571b3cb434f2

Red Hat Security Advisory 2017-0123-01

Change Mirror Download

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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: docker-latest security, bug fix, and enhancement update
Advisory ID: RHSA-2017:0123-01
Product: Red Hat Enterprise Linux Extras
Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0123.html
Issue date: 2017-01-17
CVE Names: CVE-2016-9962
=====================================================================

1. Summary:

An update for docker-latest is now available for Red Hat Enterprise Linux 7
Extras.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux 7 Extras - x86_64

3. Description:

Docker is an open-source engine that automates the deployment of any
application as a lightweight, portable, and self-sufficient container that
will run virtually anywhere.

The following packages have been upgraded to a newer upstream version:
docker-latest (1.12.5). (BZ#1404309)

Security Fix(es):

* The runc component used by `docker exec` feature of docker allowed
additional container processes via to be ptraced by the pid 1 of the
container. This allows the main processes of the container, if running as
root, to gain low-level access to these new processes during
initialization. An attacker can, depending on the nature of the incoming
process, leverage this to elevate access to the host. This ranges from
accessing host content through the file descriptors of the incoming process
to, potentially, a complete container escape by leveraging memory access or
syscall interception. (CVE-2016-9962)

Red Hat would like to thank the Docker project for reporting this issue.
Upstream acknowledges Aleksa Sarai (SUSE) and Tonis Tiigi (Docker) as the
original reporters.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1402086 - Can't open '/path/to/dir': No such file or directory; volume still in use
1404309 - [extras-rhel-7.3.2] rebase docker-latest to v1.12.4 + projectatomic patches
1406500 - fork/exec .../docker-runc: no such file or directory
1409531 - CVE-2016-9962 docker: insecure opening of file-descriptor allows privilege escalation

6. Package List:

Red Hat Enterprise Linux 7 Extras:

Source:
docker-latest-1.12.5-14.el7.src.rpm

x86_64:
docker-client-latest-1.12.5-14.el7.x86_64.rpm
docker-latest-1.12.5-14.el7.x86_64.rpm
docker-latest-logrotate-1.12.5-14.el7.x86_64.rpm
docker-latest-v1.10-migrator-1.12.5-14.el7.x86_64.rpm

Red Hat Enterprise Linux 7 Extras:

Source:
docker-latest-1.12.5-14.el7.src.rpm

x86_64:
docker-client-latest-1.12.5-14.el7.x86_64.rpm
docker-latest-1.12.5-14.el7.x86_64.rpm
docker-latest-logrotate-1.12.5-14.el7.x86_64.rpm
docker-latest-v1.10-migrator-1.12.5-14.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-9962
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/security/vulnerabilities/cve-2016-9962

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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