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Red Hat Security Advisory 2017-0127-01

Red Hat Security Advisory 2017-0127-01
Posted Jan 18, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-0127-01 - The runC tool is a lightweight, portable implementation of the Open Container Format that provides container runtime. 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 | 1ea70ec5e3f7619d7b4ac267d001d5fa

Red Hat Security Advisory 2017-0127-01

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

Synopsis: Moderate: runc security and bug fix update
Advisory ID: RHSA-2017:0127-01
Product: Red Hat Enterprise Linux Extras
Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0127.html
Issue date: 2017-01-17
CVE Names: CVE-2016-9962
=====================================================================

1. Summary:

An update for runc 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:

The runC tool is a lightweight, portable implementation of the Open
Container Format (OCF) that provides container runtime.

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/):

1409531 - CVE-2016-9962 docker: insecure opening of file-descriptor allows privilege escalation

6. Package List:

Red Hat Enterprise Linux 7 Extras:

Source:
runc-1.0.0-1.rc2.el7.src.rpm

x86_64:
runc-1.0.0-1.rc2.el7.x86_64.rpm

Red Hat Enterprise Linux 7 Extras:

Source:
runc-1.0.0-1.rc2.el7.src.rpm

x86_64:
runc-1.0.0-1.rc2.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

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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