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Category:   Application (Security)  >   policycoreutils Vendors:   Red Hat
policycoreutils Sandbox Tool Lets Local Users Escape the Sandbox to Gain Elevated Privileges
SecurityTracker Alert ID:  1037283
SecurityTracker URL:  http://securitytracker.com/id/1037283
CVE Reference:   CVE-2016-7545   (Links to External Site)
Date:  Nov 14 2016
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-2016-2702.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-2702.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 has one or more follow-up message(s) listed below.
Mar 15 2017 (Red Hat Issues Fix) policycoreutils Sandbox Tool Lets Local Users Escape the Sandbox to Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.2.
Mar 15 2017 (Red Hat Issues Fix) policycoreutils Sandbox Tool Lets Local Users Escape the Sandbox to Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.1.



 Source Message Contents

Subject:  [RHSA-2016:2702-01] Important: policycoreutils security update

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

Synopsis:          Important: policycoreutils security update
Advisory ID:       RHSA-2016:2702-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-2702.html
Issue date:        2016-11-14
CVE Names:         CVE-2016-7545 
=====================================================================

1. Summary:

An update for policycoreutils is now available for Red Hat Enterprise Linux
6 and Red Hat Enterprise Linux 7.

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 Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - 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 Desktop (v. 6):

Source:
policycoreutils-2.0.83-30.1.el6_8.src.rpm

i386:
policycoreutils-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-python-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.i686.rpm

x86_64:
policycoreutils-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-python-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
policycoreutils-2.0.83-30.1.el6_8.src.rpm

x86_64:
policycoreutils-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-python-2.0.83-30.1.el6_8.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
policycoreutils-debuginfo-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
policycoreutils-2.0.83-30.1.el6_8.src.rpm

i386:
policycoreutils-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-python-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.i686.rpm

ppc64:
policycoreutils-2.0.83-30.1.el6_8.ppc64.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.ppc64.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.ppc64.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.ppc64.rpm
policycoreutils-python-2.0.83-30.1.el6_8.ppc64.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.ppc64.rpm

s390x:
policycoreutils-2.0.83-30.1.el6_8.s390x.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.s390x.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.s390x.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.s390x.rpm
policycoreutils-python-2.0.83-30.1.el6_8.s390x.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.s390x.rpm

x86_64:
policycoreutils-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-python-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
policycoreutils-2.0.83-30.1.el6_8.src.rpm

i386:
policycoreutils-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-python-2.0.83-30.1.el6_8.i686.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.i686.rpm

x86_64:
policycoreutils-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-debuginfo-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-gui-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-newrole-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-python-2.0.83-30.1.el6_8.x86_64.rpm
policycoreutils-sandbox-2.0.83-30.1.el6_8.x86_64.rpm

Red Hat Enterprise Linux Client (v. 7):

Source:
policycoreutils-2.5-9.el7.src.rpm

x86_64:
policycoreutils-2.5-9.el7.x86_64.rpm
policycoreutils-debuginfo-2.5-9.el7.i686.rpm
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-devel-2.5-9.el7.i686.rpm
policycoreutils-devel-2.5-9.el7.x86_64.rpm
policycoreutils-gui-2.5-9.el7.x86_64.rpm
policycoreutils-newrole-2.5-9.el7.x86_64.rpm
policycoreutils-python-2.5-9.el7.x86_64.rpm
policycoreutils-sandbox-2.5-9.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-restorecond-2.5-9.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
policycoreutils-2.5-9.el7.src.rpm

x86_64:
policycoreutils-2.5-9.el7.x86_64.rpm
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-newrole-2.5-9.el7.x86_64.rpm
policycoreutils-python-2.5-9.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
policycoreutils-debuginfo-2.5-9.el7.i686.rpm
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-devel-2.5-9.el7.i686.rpm
policycoreutils-devel-2.5-9.el7.x86_64.rpm
policycoreutils-gui-2.5-9.el7.x86_64.rpm
policycoreutils-restorecond-2.5-9.el7.x86_64.rpm
policycoreutils-sandbox-2.5-9.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
policycoreutils-2.5-9.el7.src.rpm

aarch64:
policycoreutils-2.5-9.el7.aarch64.rpm
policycoreutils-debuginfo-2.5-9.el7.aarch64.rpm
policycoreutils-devel-2.5-9.el7.aarch64.rpm
policycoreutils-gui-2.5-9.el7.aarch64.rpm
policycoreutils-newrole-2.5-9.el7.aarch64.rpm
policycoreutils-python-2.5-9.el7.aarch64.rpm
policycoreutils-sandbox-2.5-9.el7.aarch64.rpm

ppc64:
policycoreutils-2.5-9.el7.ppc64.rpm
policycoreutils-debuginfo-2.5-9.el7.ppc.rpm
policycoreutils-debuginfo-2.5-9.el7.ppc64.rpm
policycoreutils-devel-2.5-9.el7.ppc.rpm
policycoreutils-devel-2.5-9.el7.ppc64.rpm
policycoreutils-gui-2.5-9.el7.ppc64.rpm
policycoreutils-newrole-2.5-9.el7.ppc64.rpm
policycoreutils-python-2.5-9.el7.ppc64.rpm
policycoreutils-sandbox-2.5-9.el7.ppc64.rpm

ppc64le:
policycoreutils-2.5-9.el7.ppc64le.rpm
policycoreutils-debuginfo-2.5-9.el7.ppc64le.rpm
policycoreutils-devel-2.5-9.el7.ppc64le.rpm
policycoreutils-gui-2.5-9.el7.ppc64le.rpm
policycoreutils-newrole-2.5-9.el7.ppc64le.rpm
policycoreutils-python-2.5-9.el7.ppc64le.rpm
policycoreutils-sandbox-2.5-9.el7.ppc64le.rpm

s390x:
policycoreutils-2.5-9.el7.s390x.rpm
policycoreutils-debuginfo-2.5-9.el7.s390.rpm
policycoreutils-debuginfo-2.5-9.el7.s390x.rpm
policycoreutils-devel-2.5-9.el7.s390.rpm
policycoreutils-devel-2.5-9.el7.s390x.rpm
policycoreutils-gui-2.5-9.el7.s390x.rpm
policycoreutils-newrole-2.5-9.el7.s390x.rpm
policycoreutils-python-2.5-9.el7.s390x.rpm
policycoreutils-sandbox-2.5-9.el7.s390x.rpm

x86_64:
policycoreutils-2.5-9.el7.x86_64.rpm
policycoreutils-debuginfo-2.5-9.el7.i686.rpm
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-devel-2.5-9.el7.i686.rpm
policycoreutils-devel-2.5-9.el7.x86_64.rpm
policycoreutils-gui-2.5-9.el7.x86_64.rpm
policycoreutils-newrole-2.5-9.el7.x86_64.rpm
policycoreutils-python-2.5-9.el7.x86_64.rpm
policycoreutils-sandbox-2.5-9.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
policycoreutils-debuginfo-2.5-9.el7.aarch64.rpm
policycoreutils-restorecond-2.5-9.el7.aarch64.rpm

ppc64:
policycoreutils-debuginfo-2.5-9.el7.ppc64.rpm
policycoreutils-restorecond-2.5-9.el7.ppc64.rpm

ppc64le:
policycoreutils-debuginfo-2.5-9.el7.ppc64le.rpm
policycoreutils-restorecond-2.5-9.el7.ppc64le.rpm

s390x:
policycoreutils-debuginfo-2.5-9.el7.s390x.rpm
policycoreutils-restorecond-2.5-9.el7.s390x.rpm

x86_64:
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-restorecond-2.5-9.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
policycoreutils-2.5-9.el7.src.rpm

x86_64:
policycoreutils-2.5-9.el7.x86_64.rpm
policycoreutils-debuginfo-2.5-9.el7.i686.rpm
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-devel-2.5-9.el7.i686.rpm
policycoreutils-devel-2.5-9.el7.x86_64.rpm
policycoreutils-gui-2.5-9.el7.x86_64.rpm
policycoreutils-newrole-2.5-9.el7.x86_64.rpm
policycoreutils-python-2.5-9.el7.x86_64.rpm
policycoreutils-sandbox-2.5-9.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
policycoreutils-debuginfo-2.5-9.el7.x86_64.rpm
policycoreutils-restorecond-2.5-9.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-2016-7545
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 2016 Red Hat, Inc.
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