ESB-2017.1896 - [Linux][RedHat] authconfig: Access confidential data - Remote/unauthenticated 2017-08-02

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1896
      Moderate: authconfig security, bug fix, and enhancement update
                               2 August 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           authconfig
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 7
                   Red Hat Enterprise Linux WS/Desktop 7
                   Linux variants
Impact/Access:     Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-7488  

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2017:2285

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Red Hat. It is recommended that administrators
         running authconfig check for an updated version of the software for
         their operating system.

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                   Red Hat Security Advisory

Synopsis:          Moderate: authconfig security, bug fix, and enhancement update
Advisory ID:       RHSA-2017:2285-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2285
Issue date:        2017-08-01
CVE Names:         CVE-2017-7488 
=====================================================================

1. Summary:

An update for authconfig is now available for Red Hat Enterprise Linux 7.

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 Client (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 Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

The authconfig packages contain a command-line utility and a GUI
application that can configure a workstation to be a client for certain
network user information, authentication schemes, and other user
information and authentication-related options.

Security Fix(es):

* A flaw was found where authconfig could configure sssd in a way that
treats existing and non-existing logins differently, leaking information on
existence of a user. An attacker with physical or network access to the
machine could enumerate users via a timing attack. (CVE-2017-7488)

This issue was discovered by Tomas Mraz (Red Hat) and Thorsten Scherf (Red
Hat).

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.4 Release Notes linked from the References section.

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/):

1329598 - authconfig breaks PAM system-auth-ac password-auth-ac for sssd in RHEL7.2
1378943 - [RFE] Allow authconfig to configure Smartcard authentication with SSSD
1441374 - gdm prompts for user password when smartcard login is configured and smartcard is inserted
1441604 - CVE-2017-7488 authconfig: Information leak when SSSD is used for authentication against remote server
1443949 - authconfig generates sssd.conf with --updateall --enablesssd --enablesssdauth
1449625 - Unlocalized strings and fuzzy translations in de, es, fr, it, ja, ko, pt_BR, ru, zh_CN, zh_TW
1450425 - After ipa-server-install cannot ssh to machine anymore.

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
authconfig-6.2.8-30.el7.src.rpm

x86_64:
authconfig-6.2.8-30.el7.x86_64.rpm
authconfig-debuginfo-6.2.8-30.el7.x86_64.rpm
authconfig-gtk-6.2.8-30.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
authconfig-6.2.8-30.el7.src.rpm

x86_64:
authconfig-6.2.8-30.el7.x86_64.rpm
authconfig-debuginfo-6.2.8-30.el7.x86_64.rpm

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

x86_64:
authconfig-debuginfo-6.2.8-30.el7.x86_64.rpm
authconfig-gtk-6.2.8-30.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
authconfig-6.2.8-30.el7.src.rpm

aarch64:
authconfig-6.2.8-30.el7.aarch64.rpm
authconfig-debuginfo-6.2.8-30.el7.aarch64.rpm
authconfig-gtk-6.2.8-30.el7.aarch64.rpm

ppc64:
authconfig-6.2.8-30.el7.ppc64.rpm
authconfig-debuginfo-6.2.8-30.el7.ppc64.rpm
authconfig-gtk-6.2.8-30.el7.ppc64.rpm

ppc64le:
authconfig-6.2.8-30.el7.ppc64le.rpm
authconfig-debuginfo-6.2.8-30.el7.ppc64le.rpm
authconfig-gtk-6.2.8-30.el7.ppc64le.rpm

s390x:
authconfig-6.2.8-30.el7.s390x.rpm
authconfig-debuginfo-6.2.8-30.el7.s390x.rpm
authconfig-gtk-6.2.8-30.el7.s390x.rpm

x86_64:
authconfig-6.2.8-30.el7.x86_64.rpm
authconfig-debuginfo-6.2.8-30.el7.x86_64.rpm
authconfig-gtk-6.2.8-30.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
authconfig-6.2.8-30.el7.src.rpm

x86_64:
authconfig-6.2.8-30.el7.x86_64.rpm
authconfig-debuginfo-6.2.8-30.el7.x86_64.rpm
authconfig-gtk-6.2.8-30.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-2017-7488
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html

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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