Arch Linux Security Advisory ASA-201701-19
=========================================
Severity: High
Date    : 2017-01-13
CVE-ID  : CVE-2016-9962
Package : docker
Type    : privilege escalation
Remote  : No
Link    : https://security.archlinux.org/AVG-133

Summary
======
The package docker before version 1:1.12.6-1 is vulnerable to privilege
escalation.

Resolution
=========
Upgrade to 1:1.12.6-1.

# pacman -Syu "docker>=1:1.12.6-1"

The problem has been fixed upstream in version 1.12.6.

Workaround
=========
None.

Description
==========
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.

Impact
=====
A local unprivileged attacker when running as root inside a docker
container is able to access the host filesystem leading to privilege
escalation.

References
=========
https://bugs.archlinux.org/task/52493
https://github.com/opencontainers/runc/commit/50a19c6ff828c58e5dab13830bd3dacde268afe5
https://bugzilla.suse.com/show_bug.cgi?id=1012568
https://github.com/moby/moby/compare/v1.12.5...v1.12.6
https://www.mail-archive.com/fulldisclosure@seclists.org/msg04165.html
https://security.archlinux.org/CVE-2016-9962

ArchLinux: 201701-19: docker: privilege escalation

January 13, 2017

Summary

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.

Resolution

Upgrade to 1:1.12.6-1. # pacman -Syu "docker>=1:1.12.6-1"
The problem has been fixed upstream in version 1.12.6.

References

https://bugs.archlinux.org/task/52493 https://github.com/opencontainers/runc/commit/50a19c6ff828c58e5dab13830bd3dacde268afe5 https://bugzilla.suse.com/show_bug.cgi?id=1012568 https://github.com/moby/moby/compare/v1.12.5...v1.12.6 https://www.mail-archive.com/fulldisclosure@seclists.org/msg04165.html https://security.archlinux.org/CVE-2016-9962

Severity
Package : docker
Type : privilege escalation
Remote : No
Link : https://security.archlinux.org/AVG-133

Workaround

None.

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