Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 514
Alerts This Week
Warning Icon 1 514

Red Hat: RHSA-2016-2588-02 Moderate: OpenSSH Privilege Escalation Threat

red hat
Calendar Grey November 3, 2016
Scroller Redhat
Cautionary notice on OpenSSH vulnerability patches for Red Hat Enterprise Linux targeting possible elevation of privileges.
An update for openssh is now available for Red Hat Enterprise Linux 7

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 7.3 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory moderate red hat privilege escalation security fix openssh

References

https://access.redhat.com/security/cve/CVE-2015-8325 https://access.redhat.com/security/updates/classification#moderate https://docs.redhat.com/en/documentation/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: openssh-6.6.1p1-31.el7.src.rpm
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-debuginfo-6.6.1p1-31.el7.x86_64.rpm openssh-keycat-6.6.1p1-31.el7.x86_64.rpm openssh-server-6.6.1p1-31.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: openssh-debuginfo-6.6.1p1-31.el7.i686.rpm openssh-debuginfo-6.6.1p1-31.el7.x86_64.rpm openssh-ldap-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
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: openssh-6.6.1p1-31.el7.src.rpm
x86_64: openssh-6.6.1p1-31.el7.x86_64.rpm openssh-clients-6.6.1p1-31.el7.x86_64.rpm openssh-debuginfo-6.6.1p1-31.el7.x86_64.rpm openssh-keycat-6.6.1p1-31.el7.x86_64.rpm openssh-server-6.6.1p1-31.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: openssh-askpass-6.6.1p1-31.el7.x86_64.rpm openssh-debuginfo-6.6.1p1-31.el7.i686.rpm openssh-debuginfo-6.6.1p1-31.el7.x86_64.rpm openssh-ldap-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

Read the Full Advisory


Advisory ID: RHSA-2016:2588-02
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2588.html
Issue date: 2016-11-03

Topic

An update for openssh is now available for Red Hat Enterprise Linux 7.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 red hat privilege escalation security fix openssh

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

1237129 - sshd -T does not output authenticationmethods with default value

1291172 - systemctl restart/start sshd shows no error if start fails

1310303 - remove GLOB_LIMIT_STAT from OpenSSH

1312013 - rhpkg prep fails on rhel-7.3 branch

1328012 - CVE-2015-8325 openssh: privilege escalation via user's PAM environment and UseLogin=yes

1328243 - OpenSSH only looks for .k5login in user directory

1344614 - sftp -m modifies umask and breaks permissions on new directories

1349556 - ssh-copy-id not working when custom loglevel is quiet

1357859 - guest_t can run sudo

1373297 - openssh can't be installed without selinux-policy

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.