Side-channel vulnerability on SMT/Hyper-Threading architectures (PortSmash)
CVE: CVE-2018-5407
Component: openssl
CWE: CWE-200
Severity: Moderate
CVSS v3: 4.7/CVSS:3.0/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Release date: 2018-10-30T00:00:00+00:00

A microprocessor side-channel vulnerability was found on SMT (e.g, Hyper-Threading) architectures. An attacker running a malicious process on the same core of the processor as the victim process can extract certain secret information.

Statement: This is a timing side-channel flaw on processors which implement SMT/Hyper-Threading architectures. It can result in leakage of secret data in applications such as OpenSSL that has secret dependent control flow at any granularity level. In order to exploit this flaw, the attacker needs to run a malicious process on the same core of the processor as the victim process.

Remediation:
For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted. After installing the updated packages, the httpd daemon will be restarted automatically.
Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258
For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.
For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted. After installing the updated packages, the httpd daemon will be restarted automatically.
Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/2974891
Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/2974891
Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258
Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258
At this time Red Hat Engineering is working on patches for openssl package in Red Hat Enterprise Linux 7 to address this issue.  Until fixes are available, users are advised to review the guidance supplied in the L1 Terminal Fault vulnerability article: https://access.redhat.com/security/vulnerabilities/L1TF and decide what their exposure across shared CPU threads are and act accordingly.