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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(Red Hat Issues Fix) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1038072
SecurityTracker URL:  http://securitytracker.com/id/1038072
CVE Reference:   CVE-2015-8325   (Links to External Site)
Date:  Mar 21 2017
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 7.3
Description:   Several vulnerabilities were reported in OpenSSH. A remote user can consume excessive CPU resources on the target system. A local user can obtain elevated privileges on the target system. A remote or local user can obtain potentially sensitive information on the target system.

A remote user can submit specially crafted (long) passwords to the target server to cause the crypt(3) function to consume excessive CPU resources on the target system [CVE-2016-6515]. Tomas Kuthan (Oracle), Andres Rojas, and Javier Nieto separately reported this vulnerability.

A local user can set specially crafted environment variables to conduct attacks against the 'bin/login' process on systems where PAM is configured to read user-specified environment variables and 'sshd_config' is set with'UseLogin=yes' [CVE-2015-8325]. The sshd(8) portable version is affected. Shayan Sadigh reported this vulnerability.

A remote or local user may be able to observe timing differences in the ssh(1) and sshd(8) CBC padding oracle countermeasures. Jean Paul Degabriele, Kenny Paterson, Torben Hansen, and Martin Albrecht reported this vulnerability.

A remote or local user may be able to detect timing differences in the ssh(1) and sshd(8) MAC verification for Encrypt-then-MAC (EtM) mode transport MAC algorithms. No leakage has been observed. Jean Paul Degabriele, Kenny Paterson, Torben Hansen, and Martin Albrecht reported this vulnerability.

Impact:   A remote user can consume excessive CPU resources on the target system.

A local user can obtain elevated privileges on the target system.

A remote or local user can obtain potentially sensitive timing information.

Solution:   Red Hat has issued a fix for CVE-2015-8325.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2017-0641.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2017-0641.html (Links to External Site)
Cause:   Access control error, Input validation error, 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.
Aug 1 2016 OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2017:0641-01] Moderate: openssh security and bug fix update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: openssh security and bug fix update
Advisory ID:       RHSA-2017:0641-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0641.html
Issue date:        2017-03-21
CVE Names:         CVE-2015-8325 
=====================================================================

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):

* It was discovered that the OpenSSH sshd daemon fetched PAM environment
settings before running the login program. In configurations with
UseLogin=yes and the pam_env PAM module configured to read user environment
settings, a local user could use this flaw to execute arbitrary code as
root. (CVE-2015-8325)

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9
Technical 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

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

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

1218424 - infinite loop, at 100% cpu in ssh if ^Z is pressed at password prompt
1327547 - ssh-copy-id fails with shells unaware of ~/
1328012 - CVE-2015-8325 openssh: privilege escalation via user's PAM environment and UseLogin=yes
1341747 - sftp -m doesn't work as advertised
1353359 - 5.3p1-117.el6 breaks gss-group1-sha1- key exchange algorithm for GSSAPIKeyExchange authentication
1353410 - [ssh-copy-id] add "The agent has no identities." in remote ~/.ssh/authorized_keys
1373836 - Remove RC4 cipher and questionable MACs enabled by default from OpenSSH
1397547 - SSH does not use the ibmca crypto hardware

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
openssh-5.3p1-122.el6.src.rpm

i386:
openssh-5.3p1-122.el6.i686.rpm
openssh-askpass-5.3p1-122.el6.i686.rpm
openssh-clients-5.3p1-122.el6.i686.rpm
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-server-5.3p1-122.el6.i686.rpm

x86_64:
openssh-5.3p1-122.el6.x86_64.rpm
openssh-askpass-5.3p1-122.el6.x86_64.rpm
openssh-clients-5.3p1-122.el6.x86_64.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-server-5.3p1-122.el6.x86_64.rpm

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

i386:
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-ldap-5.3p1-122.el6.i686.rpm
pam_ssh_agent_auth-0.9.3-122.el6.i686.rpm

x86_64:
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-ldap-5.3p1-122.el6.x86_64.rpm
pam_ssh_agent_auth-0.9.3-122.el6.i686.rpm
pam_ssh_agent_auth-0.9.3-122.el6.x86_64.rpm

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

Source:
openssh-5.3p1-122.el6.src.rpm

x86_64:
openssh-5.3p1-122.el6.x86_64.rpm
openssh-clients-5.3p1-122.el6.x86_64.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-server-5.3p1-122.el6.x86_64.rpm

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

x86_64:
openssh-askpass-5.3p1-122.el6.x86_64.rpm
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-ldap-5.3p1-122.el6.x86_64.rpm
pam_ssh_agent_auth-0.9.3-122.el6.i686.rpm
pam_ssh_agent_auth-0.9.3-122.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
openssh-5.3p1-122.el6.src.rpm

i386:
openssh-5.3p1-122.el6.i686.rpm
openssh-askpass-5.3p1-122.el6.i686.rpm
openssh-clients-5.3p1-122.el6.i686.rpm
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-server-5.3p1-122.el6.i686.rpm

ppc64:
openssh-5.3p1-122.el6.ppc64.rpm
openssh-askpass-5.3p1-122.el6.ppc64.rpm
openssh-clients-5.3p1-122.el6.ppc64.rpm
openssh-debuginfo-5.3p1-122.el6.ppc64.rpm
openssh-server-5.3p1-122.el6.ppc64.rpm

s390x:
openssh-5.3p1-122.el6.s390x.rpm
openssh-askpass-5.3p1-122.el6.s390x.rpm
openssh-clients-5.3p1-122.el6.s390x.rpm
openssh-debuginfo-5.3p1-122.el6.s390x.rpm
openssh-server-5.3p1-122.el6.s390x.rpm

x86_64:
openssh-5.3p1-122.el6.x86_64.rpm
openssh-askpass-5.3p1-122.el6.x86_64.rpm
openssh-clients-5.3p1-122.el6.x86_64.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-server-5.3p1-122.el6.x86_64.rpm

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

i386:
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-ldap-5.3p1-122.el6.i686.rpm
pam_ssh_agent_auth-0.9.3-122.el6.i686.rpm

ppc64:
openssh-debuginfo-5.3p1-122.el6.ppc.rpm
openssh-debuginfo-5.3p1-122.el6.ppc64.rpm
openssh-ldap-5.3p1-122.el6.ppc64.rpm
pam_ssh_agent_auth-0.9.3-122.el6.ppc.rpm
pam_ssh_agent_auth-0.9.3-122.el6.ppc64.rpm

s390x:
openssh-debuginfo-5.3p1-122.el6.s390.rpm
openssh-debuginfo-5.3p1-122.el6.s390x.rpm
openssh-ldap-5.3p1-122.el6.s390x.rpm
pam_ssh_agent_auth-0.9.3-122.el6.s390.rpm
pam_ssh_agent_auth-0.9.3-122.el6.s390x.rpm

x86_64:
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-ldap-5.3p1-122.el6.x86_64.rpm
pam_ssh_agent_auth-0.9.3-122.el6.i686.rpm
pam_ssh_agent_auth-0.9.3-122.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
openssh-5.3p1-122.el6.src.rpm

i386:
openssh-5.3p1-122.el6.i686.rpm
openssh-askpass-5.3p1-122.el6.i686.rpm
openssh-clients-5.3p1-122.el6.i686.rpm
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-server-5.3p1-122.el6.i686.rpm

x86_64:
openssh-5.3p1-122.el6.x86_64.rpm
openssh-askpass-5.3p1-122.el6.x86_64.rpm
openssh-clients-5.3p1-122.el6.x86_64.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-server-5.3p1-122.el6.x86_64.rpm

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

i386:
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-ldap-5.3p1-122.el6.i686.rpm
pam_ssh_agent_auth-0.9.3-122.el6.i686.rpm

x86_64:
openssh-debuginfo-5.3p1-122.el6.i686.rpm
openssh-debuginfo-5.3p1-122.el6.x86_64.rpm
openssh-ldap-5.3p1-122.el6.x86_64.rpm
pam_ssh_agent_auth-0.9.3-122.el6.i686.rpm
pam_ssh_agent_auth-0.9.3-122.el6.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-2015-8325
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_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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