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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1036487
SecurityTracker URL:  http://securitytracker.com/id/1036487
CVE Reference:   CVE-2015-8325, CVE-2016-6515   (Links to External Site)
Updated:  Aug 11 2016
Original Entry Date:  Aug 1 2016
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:   The vendor has issued a fix (7.3).

The vendor advisory is available at:

http://www.openssh.com/txt/release-7.3

Vendor URL:  www.openssh.com/txt/release-7.3 (Links to External Site)
Cause:   Access control error, Input validation error, State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 15 2016 (Ubuntu Issues Fix) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, and 16.04 LTS.
Sep 24 2016 (IBM Issues Fix for IBM AIX) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
IBM has issued a fix for IBM AIX 5.3, 6.1, 7.1, and 7.2.
Nov 4 2016 (Red Hat Issues Fix) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Nov 11 2016 (Oracle Issues Fix for Oracle Linux) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
Oracle has issued a fix for Oracle Linux 7.
Mar 21 2017 (Red Hat Issues Fix) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Mar 28 2017 (Oracle Issues Fix for Oracle Linux) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
Oracle has issued a fix for Oracle Linux 6.
Aug 10 2017 (FreeBSD Issues Fix) OpenSSH Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Timing Information and Let Local Users Gain Elevated Privileges
FreeBSD has issued a fix for FreeBSD 10.3, 11.0, and 11.1.



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