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Description of problem:
chpasswd is not SELinux aware, but is granted a default policy as if it was. Therefore root accounts with SELinux restrictions can bypass these restrictions.

Version-Release number of selected component (if applicable):
redhat-release-server-7.2-9.el7.x86_64

How reproducible:
Always.


Steps to Reproduce:
1. Create administrative account e.g. superadmin, add to wheel group
2. Add superadmin to staff_u or root selinux group: semanage -a -s root -r s0-s0:c0.c1023 superadmin
3. Restrict root account to user_u user context: semanage -m -s user_u -r s0 root
4. As "user_u" root account, change superadmin's password: echo "superadmin:owned" | chpasswd

Actual results:
Password of superadmin is changed to owned. This is unexpected since user_u should not be able to change the password of someone with a user context of root.

Expected results:
Access denied since it is the user_u context.

Additional info:
7.1 does not have this issue since the chpasswd binary is labeled as bin_t. That is only a temporary fix, the actual fix being making chpasswd SELinux aware/supported (upstream issue: https://github.com/shadow-maint/shadow/issues/22).

This change should be reverted in selinux-policy for now. Adding selinux support to chpasswd would have to be done upstream first.

RHEL-7.1
========
# matchpathcon `which chpasswd `
/usr/sbin/chpasswd	system_u:object_r:bin_t:s0
#

RHEL-7.2
========
# matchpathcon `which chpasswd `
/usr/sbin/chpasswd	system_u:object_r:passwd_exec_t:s0
#

Hi Tomas, 

This change is related to this bz:
https://bugzilla.redhat.com/show_bug.cgi?id=1243458

We should find other way how to fix it.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2322.html