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Security Leftovers

Submitted by Roy Schestowitz on Wednesday 30th of June 2021 07:20:08 PM Filed under
Security
  • An EPYC escape: Case-study of a KVM breakout

    KVM (for Kernel-based Virtual Machine) is the de-facto standard hypervisor for Linux-based cloud environments. Outside of Azure, almost all large-scale cloud and hosting providers are running on top of KVM, turning it into one of the fundamental security boundaries in the cloud.
    In this blog post I describe a vulnerability in KVM’s AMD-specific code and discuss how this bug can be turned into a full virtual machine escape. To the best of my knowledge, this is the first public writeup of a KVM guest-to-host breakout that does not rely on bugs in user space components such as QEMU. The discussed bug was assigned CVE-2021-29657, affects kernel versions v5.10-rc1 to v5.12-rc6 and was patched at the end of March 2021. As the bug only became exploitable in v5.10 and was discovered roughly 5 months later, most real world deployments of KVM should not be affected. I still think the issue is an interesting case study in the work required to build a stable guest-to-host escape against KVM and hope that this writeup can strengthen the case that hypervisor compromises are not only theoretical issues.

    I start with a short overview of KVM’s architecture, before diving into the bug and its exploitation.

  • An EPYC escape: Case-study of a KVM breakout (Project Zero blog)

    Over at the Project Zero blog, Felix Wilhelm posted a lengthy account of a vulnerability he found in the Linux kernel's KVM (Kernel-based virtual machine) subsystem

  • Is Open Source Ready For Biden’s Executive Order For Cybersecurity?

    The Linux Foundation has done an incredible job with many projects under its umbrella including the Software Package Data Exchange (SPDX) that helps track software bills of material. We hosted David A. Wheeler, Director of Open Source Supply Chain Security at The Linux Foundation, to talk more about the impact of this executive order on the industry and how well prepared Linux Foundation communities are to help organizations keep their software stack and our infrastructure safe.

  • Security updates for Wednesday

    Security updates have been issued by Debian (fluidsynth), Fedora (libgcrypt and tpm2-tools), Mageia (nettle, nginx, openvpn, and re2c), openSUSE (kernel, roundcubemail, and tor), Oracle (edk2, lz4, and rpm), Red Hat (389-ds:1.4, edk2, fwupd, kernel, kernel-rt, libxml2, lz4, python38:3.8 and python38-devel:3.8, rpm, ruby:2.5, ruby:2.6, and ruby:2.7), and SUSE (kernel and lua53).

  • Major Linux RPM problem uncovered

    In 1995, when Linux 1.x was the hot new Linux kernel, early Red Hat founding programmers Marc Ewing and Erik Troan created RPM. This software package management system became the default way to distribute software for Red Hat Linux-based distributions such as Red Hat Enterprise Linux (RHEL), CentOS Stream, AlmaLinux OS, and Rocky Linux. Unfortunately, hidden within its heart is a major security hole.

»

It's IBM RPM, not "Linux RPM"

Submitted by Roy Schestowitz on Thursday 1st of July 2021 10:26:44 PM.
  • Nasty security flaw discovered at the heart of Linux RPM

    A Linux developer has submitted a patch to fix a long-standing issue in the open source RPM package management system that can reportedly be exploited to install malicious software.

    In March 2021, Dmitry Antipov, a Linux developer with CloudLinux, pointed out that unsigned packages or packages signed with revoked keys could surreptitiously be patched or updated.

    "The problem is that both RPM and DNF (a package manager that installs, update and removes RPM packages) do a check to see if the key is valid and genuine, but not expired, but not for revocation," Antipov explained.

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