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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:  1037264
SecurityTracker URL:  http://securitytracker.com/id/1037264
CVE Reference:   CVE-2015-8325   (Links to External Site)
Date:  Nov 11 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:   Oracle has issued a fix for CVE-2015-8325.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2016-2588.html

Vendor URL:  linux.oracle.com/errata/ELSA-2016-2588.html (Links to External Site)
Cause:   Access control error, Input validation error, State error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

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:  [El-errata] ELSA-2016-2588 Moderate: Oracle Linux 7 openssh security, bug fix, and enhancement update

Oracle Linux Security Advisory ELSA-2016-2588

http://linux.oracle.com/errata/ELSA-2016-2588.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
openssh-6.6.1p1-31.el7.x86_64.rpm
openssh-askpass-6.6.1p1-31.el7.x86_64.rpm
openssh-clients-6.6.1p1-31.el7.x86_64.rpm
openssh-keycat-6.6.1p1-31.el7.x86_64.rpm
openssh-ldap-6.6.1p1-31.el7.x86_64.rpm
openssh-server-6.6.1p1-31.el7.x86_64.rpm
openssh-server-sysvinit-6.6.1p1-31.el7.x86_64.rpm
pam_ssh_agent_auth-0.9.3-9.31.el7.i686.rpm
pam_ssh_agent_auth-0.9.3-9.31.el7.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/openssh-6.6.1p1-31.el7.src.rpm



Description of changes:

[6.6.1p1-31 + 0.9.3-9]
- Do not depend on selinux-policy (#1373297)

[6.6.1p1-30 + 0.9.3-9]
- Drop dependency on libcap-ng for ssh-keycat (#1357859)

[6.6.1p1-29 + 0.9.3-9]
- Rework SELinux context handling with chroot using libcap-ng (#1357859)

[6.6.1p1-28 + 0.9.3-9]
- SFTP force permission collision with umask (#1344614)
- Make closefrom() ignore FD's to /dev/ devices on s390 (#1318760)
- Create a default value for AuthenticationMethods any (#1237129)
- Fix ssh-copy-id with LogLevel=quiet (#1349556)
- Expose more information to PAM (#1312304)
- Move MAX_DISPLAYS to a configuration option (#1341302)
- Add a wildcard option to PermitOpen directive (host) (#1344106)

[6.6.1p1-27 + 0.9.3-9]
- Coverity and RPMDiff build issues (#1334326)
- CVE-2015-8325: privilege escalation via user's PAM environment and 
UseLogin=yes (#1329191)
- Check for real location of .k5login file (#1328243)
- close ControlPersist background process stderr (#1335540)

[6.6.1p1-26 + 0.9.3-9]
- Drop glob patch for sftp client preventing listing many files (#1310303)
- Fix race condition between audit messages from different processes 
(#1310684)
- Make systemd service forking to properly report state (#1291172)
- Get rid of rpm triggers for openssh-5.x (#1312013)
- Generate the host keys when the key files are empty (#1266043)
- pam_ssh_agent_auth: authorized_keys_command option (#1317858)
- Don't use MD5 digest from pam_ssh_agent_auth in FIPS mode (#1317952)

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