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Red Hat Enterprise Linux 6 Moderate: RHSA-2017:0641-01 OpenSSH Escalation

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Calendar Grey March 21, 2017
Scroller Redhat
A significant update for OpenSSH on Red Hat Enterprise Linux 6 tackles various security vulnerabilities alongside key bug resolutions.
An update for openssh is now available for Red Hat Enterprise Linux 6

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.

Summary

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.

Topics%20covered

Topics Covered

security advisory moderate privilege escalation bug fix Red Hat Enterprise Linux patch management OpenSSH

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

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

Read the Full Advisory


Advisory ID: RHSA-2017:0641-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0641.html
Issue date: 2017-03-21

Topic

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 impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate privilege escalation bug fix Red Hat Enterprise Linux patch management OpenSSH

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

Bugs Fixed

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

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