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Security Leftovers

Submitted by Roy Schestowitz on Monday 1st of August 2022 09:09:23 PM Filed under
Security

  • Security updates for Monday [LWN.net]

    Security updates have been issued by Debian (booth, libpgjava, and thunderbird), Fedora (3mux, act, age, antlr4-project, apache-cloudstack-cloudmonkey, apptainer, aquatone, aron, asnip, assetfinder, astral, bettercap, buildah, butane, caddy, cadvisor, cheat, chisel, clash, clipman, commit-stream, containerd, cri-o, darkman, deepin-gir-generator, direnv, dnscrypt-proxy, dnsx, docker-distribution, doctl, douceur, duf, ffuf, fzf, geoipupdate, git-lfs, git-octopus, git-time-metric, glide, gmailctl, gnutls, go-bindata, goaltdns, gobuster, godep, godoctor, godotenv, gojq, golist, goloris, gomtree, google-guest-agent, gotags, gotun, grafana, gron, grpcurl, hakrevdns, hcloud, htmltest, httprobe, hulk, ignition, jid, kata-containers, kiln, kompose, kubernetes, libldb, manifest-tool, mass3, meg, meshbird, micro, mingw-harfbuzz, mingw-poppler, moby-engine, mqttcli, nats-server, nebula, netscanner, oci-seccomp-bpf-hook, ohmybackup, onionscan, open-policy-agent, origin, osbuild-composer, podman-tui, popub, powerline-go, reposurgeon, restic, runc, samba, shellz, shhgit, skopeo, snapd, snowcrash, source-to-image, subfinder, syncthing, sysutil, terrier, thunderbird, tiedot, toolbox, vgrep, vultr, vultr-cli, webanalyze, webkit2gtk3, weldr-client, wgctrl, xe-guest-utilities-latest, xen, xq, yggdrasil, yubihsm-connector, and a vast number of golang packages), Mageia (chromium-browser-stable, firefox, gdk-pixbuf2.0, python-ujson, and webmin), Red Hat (firefox and thunderbird), Slackware (gnutls), and SUSE (chromium, firefox, mozilla-nss, rubygem-tzinfo, samba, and xen).

  • UEFI – Terra Firma for Attackers

    In today’s computing environment, firmware can mean several things, ranging from an entire operating system in embedded devices to a small flash program in a hardware component that tells your operating system (OS) about that hardware’s capabilities. In this blog post, we will focus on the vulnerabilities in the latter type of firmware popularized by the Uniform Extensible Firmware Interface (UEFI). I will explore how these vulnerabilities are a lucrative target for high-profile attackers, such as nation-states that are seeking vulnerabilities in the less-visible portions of today’s computing environment.

    First, to get our footing, it is important to understand what UEFI really is. UEFI replaces the legacy Basic Input/Output System (BIOS), interfacing hardware to the OS and provides an extensible intersection between hardware and the OS itself. The UEFI standard also identifies reliable ways to update this firmware from the OS. In essence, in today’s computers, there is another layer of software that can help the OS understand and use available hardware. Of course, this essential layer of software faces all the challenges of today’s software: bugs, security issues, patching, and maintenance. It also lacks visibility, making it hard for defenders to protect this part of their computing environments from ever-increasing threats.

  • Is Linux secure? | Ubuntu

    Meet Pal. Pal is a senior developer working at PalBank. For the next 6 months, Pal will be responsible for leading the development of the bank’s web application client, which will be used daily by millions of customers.

    Pal invests considerable effort into designing and implementing the most secure app reasonably achievable: tightly controlled and secure development, build and deployment pipelines, static code analysis, pentesting by external parties, multi-factor authentication to access the app and encrypting data at rest. And the list goes on!

    Pal’s the best, isn’t he? Unfortunately, while such efforts are essential, they are insufficient! And even if we assumed, for the sake of argument and humour, that the PalBank’s client web app is completely free of all known and unknown software vulnerabilities, the app’s security guarantees are bound to be threatened once consumers run it on their endpoint devices. They will be threatened by the millions of lines of code which comprise the platform’s privileged system software, if it becomes either malicious or compromised. Within this context, system software includes the operating system, virtual machine manager and all the platforms’ firmware embedded within.

    To put it differently, it matters little if a user chooses a perfectly strong unique password, when their operating system is infected with a keylogger leaking it to malicious third-parties. Similarly, it matters little if your code has no buffer overflows, if your operating system is backdoored and simply decides to leak all your customers’ data to malicious third parties.

    So why does the security of user-level applications depend on the security of its underlying system software? The reason is the hierarchical architecture of commodity devices: privileged system software gets unrestricted access to all the resources of unprivileged user-level applications, because it controls its execution, memory, and access to the underlying hardware. Indeed, it’s a feature, not a bug!

  • Best Practices for PHP Security

    Following these best practices will help you secure your PHP applications and protect them from attack. Remember to always keep your software up to date, properly configure your web server and your PHP, and be sure to perform regular security audits to identify any vulnerabilities that may have slipped through the cracks. We hope you found this article useful and we hope you check out our other articles that may help in keeping your systems secure!

»

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today's howtos

  • How to Change Comment Color in Vim – Fix Unreadable Blue Color

    Are you annoyed about the comment color in vim? The dark blue color of the comment is often hard to read. In this tutorial, we learn how to change the comment color in Vim. There are few methods we can use to look vim comment very readable.

  • How to Add Repository to Debian

    APT checks the health of all the packages, and dependencies of the package before installing it. APT fetches packages from one or more repositories. A repository (package source) is basically a network server. The term "package" refers to an individual file with a .deb extension that contains either all or part of an application. The normal installation comes with default repositories configured, but these contain only a few packages out of an ocean of free software available. In this tutorial, we learn how to add the package repository to Debian.

  • Making a Video of a Single Window

    I recently wanted to send someone a video of a program doing some interesting things in a single X11 window. Recording the whole desktop is easy (some readers may remember my post on Aeschylus which does just that) but it will include irrelevant (and possibly unwanted) parts of the screen, leading to unnecessarily large files. I couldn't immediately find a tool which did what I wanted on OpenBSD [1] but through a combination of xwininfo, FFmpeg, and hk I was able to put together exactly what I needed in short order. Even better, I was able to easily post-process the video to shrink its file size, speed it up, and contort it to the dimension requirements of various platforms. Here's a video straight out of the little script I put together: [...]

  • Things You Can And Can’t Do

    And it got me thinking about what you can and can’t do — what you do and don’t have control over.

  • allow-new-zones in BIND 9.16 on CentOS 8 Stream under SELinux

    We run these training systems with SELinux enabled (I wouldn’t, but my colleague likes it :-), and that’s the reason I aborted the lab: I couldn’t tell students how to solve the cause other than by disabling SELinux entirely, but there wasn’t enough time for that.

  • Will the IndieWeb Ever Become Mainstream?

    This is an interesting question, thanks for asking it, Jeremy. I do have some history with the IndieWeb, and some opinions, so let’s dive in.

    The short answer to the question is a resounding no, and it all boils down to the fact that the IndieWeb is really complicated to implement, so it will only ever appeal to developers.

  • How to Install CUPS Print Server on Ubuntu 22.04

    If your business has multiple personal computers in the network which need to print, then we need a device called a print server. Print server act intermediate between PC and printers which accept print jobs from PC and send them to respective printers. CUPS is the primary mechanism in the Unix-like operating system for printing and print services. It can allow a computer to act as a Print server. In this tutorial, we learn how to set up CUPS print server on Ubuntu 22.04.

Open Hardware: XON/XOFF and Raspberry Pi Pico

  • From XON/XOFF to Forward Incremental Search

    In the olden days of computing, software flow control with control codes XON and XOFF was a necessary feature that dumb terminals needed to support. When a terminal received more data than it could display, there needed to be a way for the terminal to tell the remote host to pause sending more data. The control code 19 was chosen for this. The control code 17 was chosen to tell the remote host to resume transmission of data.

  • Raspberry Pi Pico Used in Plug and Play System Monitor | Tom's Hardware

    Dmytro Panin is at it again, creating a teeny system monitor for his MacBook from scratch with help from our favorite microcontroller, the Raspberry Pi Pico. This plug-and-play system monitor (opens in new tab) lets him keep a close eye on resource usage without having to close any windows or launch any third-party programs. The device is Pico-powered and plugs right into the MacBook to function. It has a display screen that showcases a custom GUI featuring four bar graphs that update in real-time to show the performance of different components, including the CPU, GPU, memory, and SSD usage. It makes it possible to see how hard your PC is running at a glance.

Security Leftovers

How to Apply Accent Colour in Ubuntu Desktop

A step-by-step tutorial on how to apply accent colour in Ubuntu desktop (GNOME) with tips for Kubuntu and others. Read more

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