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Category:   Application (VPN)  >   OpenSSH Vendors:   OpenSSH.org
(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
SecurityTracker Alert ID:  1038151
SecurityTracker URL:  http://securitytracker.com/id/1038151
CVE Reference:   CVE-2015-8325   (Links to External Site)
Date:  Mar 28 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:   Oracle has issued a fix for CVE-2015-8325.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2017-0641.html

Vendor URL:  linux.oracle.com/errata/ELSA-2017-0641.html (Links to External Site)
Cause:   Access control error, Input validation error, State error
Underlying OS:  Linux (Oracle)
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

Date:  Tue, 28 Mar 2017 09:55:13 -0700
Subject:  [El-errata] ELSA-2017-0641 Moderate: Oracle Linux 6 openssh security and bug fix update

Oracle Linux Security Advisory ELSA-2017-0641

http://linux.oracle.com/errata/ELSA-2017-0641.html

The following updated rpms for Oracle Linux 6 have been uploaded to the 
Unbreakable Linux Network:

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


SRPMS:
http://oss.oracle.com/ol6/SRPMS-updates/openssh-5.3p1-122.el6.src.rpm



Description of changes:

[5.3p1-122]
- Allow to use ibmca crypto hardware (#1397547)
- CVE-2015-8325: privilege escalation via user's PAM environment and 
UseLogin=yes (1405374)

[5.3p1-121]
- Fix missing hmac-md5-96 from server offer (#1373836)

[5.3p1-120]
- Prevent infinite loop when Ctrl+Z pressed at password prompt (#1218424)
- Remove RC4 cipher and MD5 based MAC from the default client proposal 
(#1373836)

[5.3p1-119]
- Resolve sftp force permission colision with umask (#1341747)
- Relax bits needed check to allow hmac-sha2-512 with gss-group1-sha1- 
(#1353359)
- close ControlPersist background process stderr when not in debug mode 
(#1335539)
- Do not add a message "The agent has no identities." in 
~/.ssh/authorized_keys (#1353410)


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