SecurityTracker.com
Keep Track of the Latest Vulnerabilities
with SecurityTracker!
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 
Sign Up
Sign Up for Your FREE Weekly SecurityTracker E-mail Alert Summary
Instant Alerts
Buy our Premium Vulnerability Notification Service to receive customized, instant alerts
Affiliates
Put SecurityTracker Vulnerability Alerts on Your Web Site -- It's Free!
Partners
Become a Partner and License Our Database or Notification Service
Report a Bug
Report a vulnerability that you have found to SecurityTracker
bugs
@
securitytracker.com






Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(Red Hat Issues Fix) OpenSSH Lets Remote Users Determine Valid Usernames on the Target System
SecurityTracker Alert ID:  1039250
SecurityTracker URL:  http://securitytracker.com/id/1039250
CVE Reference:   CVE-2016-6210   (Links to External Site)
Date:  Aug 31 2017
Impact:   Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 7.2p2; possibly prior versions
Description:   A vulnerability was reported in OpenSSH. A remote user can determine valid usernames on the target system.

A remote user can send a specially crafted request with a large password (approximately 10,000 characters) to the target ssh daemon to determine valid usernames on the target system. On systems where a valid user's password has been hashed with SHA256/SHA512, the response time will be shorter for a non-existent username than for a valid username.

Eddie Harari reported this vulnerability.

Impact:   A remote user can determine valid usernames on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:2563

Vendor URL:  access.redhat.com/errata/RHSA-2017:2563 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Jul 16 2016 OpenSSH Lets Remote Users Determine Valid Usernames on the Target System



 Source Message Contents

Subject:  [RHSA-2017:2563-01] Moderate: openssh security update

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

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

Synopsis:          Moderate: openssh security update
Advisory ID:       RHSA-2017:2563-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:2563
Issue date:        2017-08-31
CVE Names:         CVE-2016-6210 
=====================================================================

1. Summary:

An update for openssh is now available for Red Hat Enterprise Linux 6.

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 Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (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 Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

OpenSSH is an SSH protocol implementation supported by a number of Linux,
UNIX, and similar operating systems. It includes the core files necessary
for both the OpenSSH client and server.

Security Fix(es):

* A covert timing channel flaw was found in the way OpenSSH handled
authentication of non-existent users. A remote unauthenticated attacker
could possibly use this flaw to determine valid user names by measuring the
timing of server responses. (CVE-2016-6210)

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

After installing this update, the OpenSSH server daemon (sshd) will be
restarted automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1357442 - CVE-2016-6210 openssh: User enumeration via covert timing channel

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
openssh-5.3p1-123.el6_9.src.rpm

i386:
openssh-5.3p1-123.el6_9.i686.rpm
openssh-askpass-5.3p1-123.el6_9.i686.rpm
openssh-clients-5.3p1-123.el6_9.i686.rpm
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-server-5.3p1-123.el6_9.i686.rpm

x86_64:
openssh-5.3p1-123.el6_9.x86_64.rpm
openssh-askpass-5.3p1-123.el6_9.x86_64.rpm
openssh-clients-5.3p1-123.el6_9.x86_64.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-server-5.3p1-123.el6_9.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-ldap-5.3p1-123.el6_9.i686.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.i686.rpm

x86_64:
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-ldap-5.3p1-123.el6_9.x86_64.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.i686.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.x86_64.rpm

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

Source:
openssh-5.3p1-123.el6_9.src.rpm

x86_64:
openssh-5.3p1-123.el6_9.x86_64.rpm
openssh-clients-5.3p1-123.el6_9.x86_64.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-server-5.3p1-123.el6_9.x86_64.rpm

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

x86_64:
openssh-askpass-5.3p1-123.el6_9.x86_64.rpm
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-ldap-5.3p1-123.el6_9.x86_64.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.i686.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
openssh-5.3p1-123.el6_9.src.rpm

i386:
openssh-5.3p1-123.el6_9.i686.rpm
openssh-askpass-5.3p1-123.el6_9.i686.rpm
openssh-clients-5.3p1-123.el6_9.i686.rpm
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-server-5.3p1-123.el6_9.i686.rpm

ppc64:
openssh-5.3p1-123.el6_9.ppc64.rpm
openssh-askpass-5.3p1-123.el6_9.ppc64.rpm
openssh-clients-5.3p1-123.el6_9.ppc64.rpm
openssh-debuginfo-5.3p1-123.el6_9.ppc64.rpm
openssh-server-5.3p1-123.el6_9.ppc64.rpm

s390x:
openssh-5.3p1-123.el6_9.s390x.rpm
openssh-askpass-5.3p1-123.el6_9.s390x.rpm
openssh-clients-5.3p1-123.el6_9.s390x.rpm
openssh-debuginfo-5.3p1-123.el6_9.s390x.rpm
openssh-server-5.3p1-123.el6_9.s390x.rpm

x86_64:
openssh-5.3p1-123.el6_9.x86_64.rpm
openssh-askpass-5.3p1-123.el6_9.x86_64.rpm
openssh-clients-5.3p1-123.el6_9.x86_64.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-server-5.3p1-123.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-ldap-5.3p1-123.el6_9.i686.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.i686.rpm

ppc64:
openssh-debuginfo-5.3p1-123.el6_9.ppc.rpm
openssh-debuginfo-5.3p1-123.el6_9.ppc64.rpm
openssh-ldap-5.3p1-123.el6_9.ppc64.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.ppc.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.ppc64.rpm

s390x:
openssh-debuginfo-5.3p1-123.el6_9.s390.rpm
openssh-debuginfo-5.3p1-123.el6_9.s390x.rpm
openssh-ldap-5.3p1-123.el6_9.s390x.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.s390.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.s390x.rpm

x86_64:
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-ldap-5.3p1-123.el6_9.x86_64.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.i686.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
openssh-5.3p1-123.el6_9.src.rpm

i386:
openssh-5.3p1-123.el6_9.i686.rpm
openssh-askpass-5.3p1-123.el6_9.i686.rpm
openssh-clients-5.3p1-123.el6_9.i686.rpm
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-server-5.3p1-123.el6_9.i686.rpm

x86_64:
openssh-5.3p1-123.el6_9.x86_64.rpm
openssh-askpass-5.3p1-123.el6_9.x86_64.rpm
openssh-clients-5.3p1-123.el6_9.x86_64.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-server-5.3p1-123.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-ldap-5.3p1-123.el6_9.i686.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.i686.rpm

x86_64:
openssh-debuginfo-5.3p1-123.el6_9.i686.rpm
openssh-debuginfo-5.3p1-123.el6_9.x86_64.rpm
openssh-ldap-5.3p1-123.el6_9.x86_64.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.i686.rpm
pam_ssh_agent_auth-0.9.3-123.el6_9.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-2016-6210
https://access.redhat.com/security/updates/classification/#moderate

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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iD8DBQFZqCpaXlSAg2UNWIIRAqaGAKCxKKqNPpXeaeR2ChfmFnlXyUl1LgCgkkLs
Bbu1lhk6Dvd+PfAeTNvcyL4=
=j5vQ
-----END PGP SIGNATURE-----

--
RHSA-announce mailing list
RHSA-announce@redhat.com
https://www.redhat.com/mailman/listinfo/rhsa-announce
 
 


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

Copyright 2017, SecurityGlobal.net LLC