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Category:   Application (Security)  >   policycoreutils Vendors:   Red Hat
(Red Hat Issues Fix) policycoreutils Sandbox Tool Lets Local Users Escape the Sandbox to Gain Elevated Privileges
SecurityTracker Alert ID:  1038033
SecurityTracker URL:  http://securitytracker.com/id/1038033
CVE Reference:   CVE-2016-7545   (Links to External Site)
Date:  Mar 15 2017
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in policycoreutils. A local user can obtain elevated privileges on the target system.

A local user can run a specially crafted application to conduct a TIOCSTI IOCTL attack and execute arbitrary commands on the target system with the privileges of the parent shell process.

Federico Bento reported this vulnerability.

Impact:   A local user can escape the sandbox and obtain the privileges on the target parent shell process.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0535.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0535.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Nov 14 2016 policycoreutils Sandbox Tool Lets Local Users Escape the Sandbox to Gain Elevated Privileges



 Source Message Contents

Date:  Wed, 15 Mar 2017 10:03:36 -0400
Subject:  [RHSA-2017:0535-01] Important: policycoreutils security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: policycoreutils security update
Advisory ID:       RHSA-2017:0535-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0535.html
Issue date:        2017-03-15
CVE Names:         CVE-2016-7545 
=====================================================================

1. Summary:

An update for policycoreutils is now available for Red Hat Enterprise Linux
7.2 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 ComputeNode EUS (v. 7.2) - x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) - x86_64
Red Hat Enterprise Linux Server EUS (v. 7.2) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.2) - ppc64, ppc64le, s390x, x86_64

3. Description:

The policycoreutils packages contain the core policy utilities required to
manage a SELinux environment.

Security Fix(es):

* It was found that the sandbox tool provided in policycoreutils was
vulnerable to a TIOCSTI ioctl attack. A specially crafted program executed
via the sandbox command could use this flaw to execute arbitrary commands
in the context of the parent shell, escaping the sandbox. (CVE-2016-7545)

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/):

1378577 - CVE-2016-7545 policycoreutils: SELinux sandbox escape via TIOCSTI ioctl

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.2):

Source:
policycoreutils-2.2.5-21.el7_2.src.rpm

x86_64:
policycoreutils-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-newrole-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-python-2.2.5-21.el7_2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2):

x86_64:
policycoreutils-debuginfo-2.2.5-21.el7_2.i686.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-devel-2.2.5-21.el7_2.i686.rpm
policycoreutils-devel-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-gui-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-restorecond-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-sandbox-2.2.5-21.el7_2.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.2):

Source:
policycoreutils-2.2.5-21.el7_2.src.rpm

ppc64:
policycoreutils-2.2.5-21.el7_2.ppc64.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.ppc.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.ppc64.rpm
policycoreutils-devel-2.2.5-21.el7_2.ppc.rpm
policycoreutils-devel-2.2.5-21.el7_2.ppc64.rpm
policycoreutils-gui-2.2.5-21.el7_2.ppc64.rpm
policycoreutils-newrole-2.2.5-21.el7_2.ppc64.rpm
policycoreutils-python-2.2.5-21.el7_2.ppc64.rpm
policycoreutils-sandbox-2.2.5-21.el7_2.ppc64.rpm

ppc64le:
policycoreutils-2.2.5-21.el7_2.ppc64le.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.ppc64le.rpm
policycoreutils-devel-2.2.5-21.el7_2.ppc64le.rpm
policycoreutils-gui-2.2.5-21.el7_2.ppc64le.rpm
policycoreutils-newrole-2.2.5-21.el7_2.ppc64le.rpm
policycoreutils-python-2.2.5-21.el7_2.ppc64le.rpm
policycoreutils-sandbox-2.2.5-21.el7_2.ppc64le.rpm

s390x:
policycoreutils-2.2.5-21.el7_2.s390x.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.s390.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.s390x.rpm
policycoreutils-devel-2.2.5-21.el7_2.s390.rpm
policycoreutils-devel-2.2.5-21.el7_2.s390x.rpm
policycoreutils-gui-2.2.5-21.el7_2.s390x.rpm
policycoreutils-newrole-2.2.5-21.el7_2.s390x.rpm
policycoreutils-python-2.2.5-21.el7_2.s390x.rpm
policycoreutils-sandbox-2.2.5-21.el7_2.s390x.rpm

x86_64:
policycoreutils-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.i686.rpm
policycoreutils-debuginfo-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-devel-2.2.5-21.el7_2.i686.rpm
policycoreutils-devel-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-gui-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-newrole-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-python-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-sandbox-2.2.5-21.el7_2.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.2):

ppc64:
policycoreutils-debuginfo-2.2.5-21.el7_2.ppc64.rpm
policycoreutils-restorecond-2.2.5-21.el7_2.ppc64.rpm

ppc64le:
policycoreutils-debuginfo-2.2.5-21.el7_2.ppc64le.rpm
policycoreutils-restorecond-2.2.5-21.el7_2.ppc64le.rpm

s390x:
policycoreutils-debuginfo-2.2.5-21.el7_2.s390x.rpm
policycoreutils-restorecond-2.2.5-21.el7_2.s390x.rpm

x86_64:
policycoreutils-debuginfo-2.2.5-21.el7_2.x86_64.rpm
policycoreutils-restorecond-2.2.5-21.el7_2.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-2016-7545
https://access.redhat.com/security/updates/classification/#important

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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