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Microsoft’s File-Tainting System ’Tain’t Working
by Lawrence D'Oliveiro 15 Mar '23

15 Mar '23

Microsoft has a clever-sounding system for trying to protect Windows users from downloading malicious files: it’s called “Mark-Of-The-Web”. What it means is that any file downloaded from an untrusted source is supposed to have a special flag set in its NTFS metadata indicating that the file is not to be trusted. So any attempt by the user to perform sensitive operations on that file (e.g. execute macros from it, run it as an executable) is supposed to trigger appropriate system warnings. If the file is a .zip archive, then this mark is supposed to be propagated to all files extracted from that archive. However, it turns out this mechanism can be bypassed (surprise, surprise) <https://www.theregister.com/2022/11/01/microsoft_motw_malware_flaw/>. How can this happen? The flaw lies in the mechanism used to tell Windows to trust downloaded files, by attaching an “Authenticode” signature to them. Files without such signatures are of course untrusted and will trigger the appropriate warnings. However, by attaching an invalid signature of a particular form, you can trigger an error response from the signature-checking process that is actually interpreted as “this file is OK” <https://blog.0patch.com/2022/10/free-micropatches-for-bypassing-motw.html>. What do you call it when an attempt to add mechanisms to make a system more secure actually increases the attack surface on that system? By the way, the referenced Twitter thread discussing this vulnerability <https://twitter.com/GossiTheDog/status/1579895038523609088> seems to be saying that no Mark-Of-The-Web propagation is done for files extracted from .iso disc images. And that Microsoft uses this form for distributing its own software (Visio was mentioned) precisely to avoid the hassle of going through vetting by third-party antimalware tools.

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cURL, the omnipresent data tool, is getting a 25th birthday party this month
by Peter Reutemann 13 Mar '23

13 Mar '23

'When you first start messing with the command line, it can feel like there's an impermeable wall between the local space you're messing around in and the greater Internet. On your side, you've got your commands and files, and beyond the wall, there are servers, images, APIs, webpages, and more bits of useful, ever-changing data. One of the most popular ways through that wall has been cURL, or "client URL," which turns 25 this month. The cURL tool started as a way for programmer Daniel Stenberg to let Internet Chat Relay users quickly fetch currency exchange rates while still inside their chat window. As detailed in an archived history of the project, it was originally built off an existing command-line tool, httpget, built by Rafael Sagula. A 1.0 version was released in 1997, then changed names to urlget by 2.0, as it had added in GOPHER, FTP, and other protocols. By 1998, the tool could upload as well as download, and so version 4.0 was named cURL. Over the next few years, cURL grew to encompass nearly every Internet protocol, work with certificates and encryption, offer bindings for more than 50 languages, and be included in most Linux distributions and other systems. The cURL project now encompasses both the command-line command itself and the libcurl library. In 2020, the project's history estimated the command and library had been installed in more than 10 billion instances worldwide.' -- source: https://arstechnica.com/information-technology/2023/03/curl-the-omnipresent… Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Backblaze: SSDs Only Slightly More Reliable Than Hard Drives
by Lawrence D'Oliveiro 11 Mar '23

11 Mar '23

The latest storage reliability report from backup company Backblaze is out <https://blocksandfiles.com/2023/03/10/backblaze-ssd-vs-hdd/>, and they are starting to include data from their increasing use of SSDs. One result: SSDs are not much more reliable than hard drives. They find an annualized failure rate of 1.64% for HDDs, 0.98% for the solid-state ones. You could say that’s over 50% greater reliability, but it’s not enough to make any material difference to the need for a proper backup regime. Another interesting result is that SMART diagnostics from SSD controllers seem to be very inconsistent. That is to say, they are even less useful than the ones from hard drives. Not that I would bother with either.

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Malware infecting widely used security appliance survives firmware updates
by Peter Reutemann 10 Mar '23

10 Mar '23

'Threat actors with a connection to the Chinese government are infecting a widely used security appliance from SonicWall with malware that remains active even after the device receives firmware updates, researchers said. SonicWall’s Secure Mobile Access 100 is a secure remote access appliance that helps organizations securely deploy remote workforces. Customers use it to grant granular access controls to remote users, provide VPN connections to organization networks, and set unique profiles for each employee. The access the SMA 100 has to customer networks makes it an attractive target for threat actors. In 2021, the device came under attack by sophisticated hackers who exploited what was then a zero-day vulnerability. Security appliances from Fortinet and Pulse Secure have come under similar attacks in recent years.' -- source: https://arstechnica.com/information-technology/2023/03/malware-infecting-wi… Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Raspberry Pi Lets You Have Your Own Global Shutter Camera For $50
by Peter Reutemann 10 Mar '23

10 Mar '23

'Global shutter sensors with no skew or distortion have been promised as the future of cameras for years now, but so far only a handful of products with that tech have made it to market. Now, Raspberry Pi is offering a 1.6-megapixel global shutter camera module to hobbyists for $50, providing a platform for machine vision, hobbyist shooting and more. From a report: The Raspberry Pi Global Shutter Camera uses a 6.3mm Sony IMX296 sensor, and requires a Raspberry Pi board with a CSI camera connector. Like other global shutter sensors, it works by pairing each pixel with an analog storage element, so that light signals can be captured and stored by all pixels simultaneously. By comparison, regular CMOS sensors read and store the light captured by pixels from top to bottom and left to right. That can cause diagonal skew on fast moving subjects, or very weird distortion on rotating objects like propellers.' -- source: https://it.slashdot.org/story/23/03/09/1241216 If only you could get hands on the Raspberry Pis themselves... ;-) Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Linux Mint Mate - number of workspaces read-only
by Peter Reutemann 08 Mar '23

08 Mar '23

Hi everyone I've been baffled with my Linux Mint Mate 20.2 for a while now that I couldn't change the number of workspaces, as it was greyed in the preferences of the workspace switcher (fixed to 4). Used to work in the past (and maybe again with newer versions). Finally came across a command-line that can change the number of workspaces, bypassing the preferences dialog: gsettings set org.mate.Marco.general num-workspaces 4 Source: https://forums.linuxmint.com/viewtopic.php?t=298336 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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The SCO Lawsuit: Looking Back 20 Years Later
by Peter Reutemann 07 Mar '23

07 Mar '23

'"On March 7, 2003, a struggling company called The SCO Group filed a lawsuit against IBM," writes LWN.net, "claiming that the success of Linux was the result of a theft of SCO's technology..." Two decades later, "It is hard to overestimate how much the community we find ourselves in now was shaped by a ridiculous lawsuit 20 years ago...." It was the claim of access to Unix code that was the most threatening allegation for the Linux community. SCO made it clear that, in its opinion, Linux was stolen property: "It is not possible for Linux to rapidly reach UNIX performance standards for complete enterprise functionality without the misappropriation of UNIX code, methods or concepts". To rectify this "misappropriation", SCO was asking for a judgment of at least $1 billion, later increased to $5 billion. As the suit dragged on, SCO also started suing Linux users as it tried to collect a tax for use of the system. Though this has never been proven, it was widely assumed at the time that SCO's real objective was to prod IBM into acquiring the company. That would have solved SCO's ongoing business problems and IBM, for rather less than the amount demanded in court, could have made an annoying problem go away and also lay claim to the ownership of Unix — and, thus, Linux. To SCO's management, it may well have seemed like a good idea at the time. IBM, though, refused to play that game; the company had invested heavily into Linux in its early days and was uninterested in allowing any sort of intellectual-property taint to attach to that effort. So the company, instead, directed its not inconsiderable legal resources to squashing this attack. But notably, so did the development community as a whole, as did much of the rest of the technology industry. Over the course of the following years — far too many years — SCO's case fell to pieces. The "misappropriated" technology wasn't there. Due to what must be one of the worst-written contracts in technology-industry history, it turned out that SCO didn't even own the Unix copyrights it was suing over. The level of buffoonery was high from the beginning and got worse; the company lost at every turn and eventually collapsed into bankruptcy.... Microsoft, which had not yet learned to love Linux, funded SCO and loudly bought licenses from the company. Magazines like Forbes were warning the "Linux-loving crunchies in the open-source movement" that they "should wake up". SCO was suggesting a license fee of $1,399 — per-CPU — to run Linux.... Such an effort, in less incompetent hands, could easily have damaged Linux badly. As it went, SCO, despite its best efforts, instead succeeded in improving the position of Linux — in development, legal, and economic terms — considerably. The article argues SCO's lawsuit ultimately proved that Linux didn't contain copyrighted code "in a far more convincing way than anybody else could have." (And the provenance of all Linux code contributions are now carefully documented.) The case also proved the need for lawyers to vigorously defend the rights of open source programmers. And most of all, it revealed the Linux community was widespread and committed. And "Twenty years later, it is fair to say that Linux is doing a little better than The SCO Group. Its swaggering leader, who thought to make his fortune by taxing Linux, filed for personal bankruptcy in 2020."' -- source: https://linux.slashdot.org/story/23/03/04/0359236 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Will AMD's 'openSIL' Library Enable Open-Source Silicon Initialization With Coreboot?
by Peter Reutemann 07 Mar '23

07 Mar '23

'Formerly known as LinuxBIOS, coreboot is defined by Wikipedia as "a software project aimed at replacing proprietary firmware (BIOS or UEFI) found in most computers with a lightweight firmware." Phoronix is wondering if there's about to be a big announcement from AMD: AMD dropped a juicy tid-bit of information to be announced next month with "openSIL" [an open-source AMD x86 silicon initialization library], complete with AMD Coreboot support.... While about a decade ago AMD was big into Coreboot and at the time committed to it for future hardware platforms (2011: AMD To Support Coreboot On All Future CPUs) [and] open-source AGESA at the time did a lot of enabling around it, that work had died off. In more recent years, AMD's Coreboot contributions have largely been limited to select consumer APU/SoC platforms for Google Chromebook use. But issues around closing up the AGESA as well as concerns with the AMD Platform Security Processor (PSP) have diminished open-source firmware hopes in recent years.... For the Open Compute Project Regional Summit in Prague, there is a new entry added with a title of OSF on AMD — Enabled by openSIL (yes, folks, OSF as in "Open-Source Firmware").... [H]opefully this will prove to be a monumental shift for open-source firmware in the HPC server space. >From the talk's description: openSIL (AMD open-source x86 Silicon Initialization Library) offers the versatility, scalability, and light weight interface to allow for ease of integration with open-source and/or proprietary host boot solutions such as coreboot, UEFI and others and adds major flexibility to the overall platform design. In other words, this library-based solution simply allows a platform integrator to scale from feature rich solutions such as UEFI to slim, lightweight, and secure solutions such as coreboot. The description promises the talk will include demonstrations "highlighting system bring-up using openSIL integrated with coreboot and UEFI Host Firmware stacks on AMD's Genoa based platforms."' -- source: https://news.slashdot.org/story/23/03/06/0253208 Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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AGM minutes
by Peter Reutemann 01 Mar '23

01 Mar '23

Hi everyone The second attempt at running our AGM took place successfully on Monday night and the minutes are now available: http://wiki.wlug.org.nz/MeetingTopics.2023-02-27 Due to no one stepping forward to take up the president's office, we've decided to wind up the society. Thanks everyone for supporting WLUG over the years. We will keep this mailing list open as a place for exchanging news and knowledge around Linux and open source software. Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, Hamilton, NZ Mobile +64 22 190 2375 https://www.cs.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

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Quote Of The Week
by Lawrence D'Oliveiro 28 Feb '23

28 Feb '23

>From a reader comment to an article <https://www.theregister.com/2023/02/27/microsoft_ai_gpt3_data/> wherein Microsoft suggests that, since these machine-learning models are so good at generating fake and even nonsensical responses, why not use them to deliberately generate fictional sample data for testing purposes: For decades, we've written hundreds of sci-fi stories where you have an evil out-of-control AI, and that AI is hyperintelligent but can only reason along strict logical lines, and is ultimately defeated by exploiting its lack of imagination. And then, suddenly, it turns out that the AIs we can actually make have way too much imagination, and are utterly incapable of logical thought. I find this hilarious.

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