First a brief history of Diffie-Hellman for those not familiar with it
The short version of Diffie-Hellman is that two parties (Alice and Bob) want to share a secret so they can encrypt their communications and talk securely without an eavesdropper (Eve) listening in. So Alice and Bob first share a public prime number and modulus (which Eve can see). Alice and Bob then each choose a large random number (referred to as their private key) and apply some modular arithmetic using the shared prime...
Executive Summary: The IKE daemons in RHEL7 (libreswan) and RHEL6 (openswan) are not vulnerable to the SLOTH attack. But the attack is still interesting to look at .
The SLOTH attack released today is a new transcript collision attack against some security protocols that use weak or broken hashes such as MD5 or SHA1. While it mostly focuses on the issues found in TLS, it also mentions weaknesses in the "Internet Key Exchange" (IKE) protocol used for IPsec VPNs. While the TLS findings are very...
It seems that everyone has a metaphor to explain what containers "are". If you want to emphasize the self-contained nature of containers and the way in which they can package a whole operating system's worth of dependencies, you might say that they are like virtual machines. If you want to emphasize the portability of containers and their role as a distribution mechanism, you might say that they are like a platform. If you want to emphasize the dangerous state of container security nowadays,...
The Customer Portal team here at Red Hat talks A LOT about content. We talk about creating it, serving it, indexing it and maintaining it. The list goes on. One aspect of content we’ve been focusing on a lot lately, and one I talked about in a previous post, is presentation. Even the best, most detailed and accurate content can still fail customers if it’s not presented well.
As a result of this insight, we’ve turned our collective eyes toward security content and its presentation in the...
Provisioning in PXE-less or DHCP-less environments is a common scenario in the enterprise and Satellite 6 offered Bootdisk plugin to solve this problem partially. The Satellite 6.1.5 feature erratum introduces PXE-less discovery which is a great alternative with much broader hardware support.
Starting today, it is possible to boot provisioned hosts from the Discovery image directly as a CDROM/DVDROM ISO that can be also transferred to hard drive or USB stick. Since the Discovery image is based...
Bootdisk plugin enables Satellite users to download Host based or Generic host images. These are small ISO images pre-loaded with SYSLINUX which chainloads iPXE. The iPXE firmware is able to load kernels via HTTP, but since there is no PXE (UNDI) involved, hardware iPXE driver must exist for this to work. Unfortunately, not all network cards will work with iPXE, therefore the host-based images cannot be used.
The Host image embeds network credentials (IP, gateway, netmask, DNS) therefore DHCP...
In April 2015 we took a look at a years worth of branded vulnerabilities, separating out those that mattered from those that didn’t. Six months have passed so let’s take this opportunity to update the report with the new vulnerabilities that mattered across all Red Hat products.
ABRT (April 2015) CVE-2015-3315:
ABRT (Automatic Bug Reporting Tool) is a tool to help users to detect defects in applications and to create a bug report. ABRT was vulnerable to multiple race condition and...
Since 2009, Red Hat has provided details of vulnerabilities with CVE names as part of our mission to provide as much information around vulnerabilities that affect Red Hat products as possible. These CVE pages distill information from a variety of sources to provide an overview of each flaw, including information like a description of the flaw, CVSSv2 scores, impact, public dates, and any corresponding errata that corrected the flaw in Red Hat products.
Over time this has grown to include more...
We are pleased to announce that Red Hat Satellite version 6.1.1, released August 2015, now features integration with Puppet Enterprise. It’s available today on the Puppet Forge.
For customers with both Red Hat Satellite version 6.1.1 and Puppet Enterprise, this module will enable the availability of facts and Puppet agent run reports in both Puppet Enterprise and in Red Hat Satellite, preserving the health dashboards, inventory, and search capabilities of both products. More information and...
Here in the Red Hat Customer Portal we're always striving for the best possible customer experience. We constantly examine feedback, identify pain points, and test to make sure we're delivering on the subscription value that sets Red Hat apart from its competitors. We make enhancements continuously, but in this post I wanted to round up a few recent changes that hopefully improve your experience as a user of the Red Hat Customer Portal.
Knowlegebase content redesign - If you’re a regular...
Last week, Red Hat investigated an intrusion on the sites of both the Ceph community project (ceph.com) and Inktank (download.inktank.com), which were hosted on a computer system outside of Red Hat infrastructure.
download.inktank.com provided releases of the Red Hat Ceph product for Ubuntu and CentOS operating systems. Those product versions were signed with an Inktank signing key (id 5438C7019DCEEEAD). ceph.com provided the upstream packages for the Ceph community versions signed with a Ceph...
What is being disclosed today?
Back in 1996, Arjen Lenstra described an attack against an optimization (called the Chinese Remainder Theorem optimization, or RSA-CRT for short). If a fault happened during the computation of a signature (using the RSA-CRT optimization), an attacker might be able to recover the private key from the signature (an “RSA-CRT key leak”). At the time, use of cryptography on the Internet was uncommon, and even ten years later, most TLS (or HTTPS) connections were immune...
This blog post looks at the final part of creating secure software: shipping it to users in a safe way. It explains how to use transport security and package signatures to achieve this goal.
yum versus rpm
There are two commonly used tools related to RPM package management, yum and rpm. (Recent Fedora versions have replaced yum with dnf, a rewrite with similar functionality.) The yum tool inspects package sources (repositories), downloads RPM packages, and makes sure that required dependencies...
We are proud to announce the availability of Red Hat Satellite 6.1. This new version of Satellite includes several security features, introduces new management capabilities related to containers and many other enhancements.
Errata Management Enhancements
Enhanced errata management refines the organization and applicability of security, bug, and enhancement patches. Improved reporting enables organizations to easily identify which hosts are affected and quickly respond to...
Most programming languages contain powerful features, that used correctly are incredibly powerful, but used incorrectly can be incredibly dangerous. Serialization (and deserialization) is one such feature available in most modern programming languages. As mentioned in a previous article:
“Serialization is a feature of programming languages that allows the state of in-memory objects to be represented in a standard format, which can be written to disk or transmitted across a network.”
Updated 2015-07-24 @ 12:33 UTC
It was discovered that the libuser library contains two vulnerabilities which, in combination, allow unprivileged local users to gain root privileges. libuser is a library that provides read and write access to files like /etc/passwd, which constitute the system user and group database. On Red Hat Enterprise Linux it is a central system component.
What is being disclosed today?
Qualys reported two vulnerabilities:
CVE-2015-3245: The userhelper program allows...
The Foreman-OpenSCAP gem suite enables Satellite 6.1 to receive automated vulnerability assessment and security compliance audits from managed hosts.
You can upload SCAP compliance contents, create compliance policies out of them and assign the policies to hosts or hostgroups. The foreman_openscap plugin provides three default SCAP contents, so you can start testing security compliance on RHEL6/7 and on Fedora.
OpenSCAP reports (aka ARF reports) will help you find vulnerabilities...
We are pleased to announce that Satellite version 6.1 is now available for public beta. Satellite 6.1 features numerous enhancements and fixes that improve stability, reliability and scalability. New features include errata management enhancements, automated provisioning of bare metal servers, content ISOs for disconnected environments and the introduction of both OpenSCAP and container management. All current Satellite customers are eligible to participate in the beta. If you would like to...
In March of 2015 the 0.10.0 version of OpenConnect VPN was released. One of its main features is the addition of MS-KKDCP support and GSSAPI authentication. Putting the acronyms aside that means that authentication in FreeIPA, which uses Kerberos, is greatly simplified for VPN users. Before explaining more, let's first explore what the typical login process is on a VPN network.
Currently, with a VPN server/product one needs to login to the VPN server using some username-password pair, and then...
It's 2015 and it's pretty clear the Open Source way has largely won as a development model for large and small projects. But when it comes to security we still practice a less-than-open model of embargoes with minimal or, in some cases, no community involvement. With the transition to more open development tools, such as Gitorious and GitHub, it is now time for the security process to change and become more open.
In general the argument for embargoes simply consists of "we'll fix...
Software security vulnerabilities are a fact of life. So is the subsequent publicity, package updates, and suffering service restarts. Administrators are used to it, and users bear it, and it's a default and traditional method.
On the other hand, in some circumstances the update & restart methods are unacceptable, leading to the development of online fix facilities like kpatch, where code may be surgically replaced in a running system. There is plenty of potential in these systems, but they...
To see why, we first have to examine traditional SQL injection.
Traditional SQL injection
Most programming languages do not track where strings and numbers come from....
Are you looking for ways to deliver your applications more quickly and with less effort? Do you need to move more services to the cloud?
Red Hat has these same issues and goals. By using our own product OpenShift, we have been able to shorten our release cycle times and support our developers better.
We built and deployed our own OpenShift Enterprise Platform-as-a-Service (PaaS) offering and are running it in Amazon Web Services (AWS). This has allowed our teams to have more control over...
Add an External Registry Server
Add a Content View & Life Cycle
Add a Compute Resource
Provision a Container From Docker Hub
Provision Container from External Registry
Provision Container from Content View
One of the first things you will want to do, after coming up to speed with Docker, is probably setup a Registry Server. The Docker project provides a basic Registry Server which...
QEMU is a generic and open source machine emulator and virtualizer and is incorporated in some Red Hat products as a foundation and hardware emulation layer for running virtual machines under the Xen and KVM hypervisors.
CVE-2015-3456 (aka VENOM) is a security flaw in the QEMU's Floppy Disk Controller (FDC) emulation. It can be exploited by a malicious guest user with access to the FDC I/O ports by issuing specially crafted FDC commands to the controller. It can result in guest controlled...