ฝึกพูดภาษาอังกฤษด้วยเทคนิค Shadowing จากวิดีโอ: Linux got wrecked by backdoor attack
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Over the last few days, the open -source world has been in panic mode.
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A highly sophisticated and carefully planned attack affecting the XZ compression tool was shipped to production,
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and has compromised Linux distros like Debian, Kali, OpenSUSE, and others.
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Thank God, TempleOS is unaffected though, and it's quite possibly one of the most well -executed supply chain attacks of all time,
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and gives some random dude unfettered access to execute code on your machine via a secret backdoor.
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This is not your everyday security vulnerability.
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It's a threat -level midnight 10 .0 critical issue on the CVE Richter scale, even higher than famous bugs like Heartbleed, Log4Shell, and Shellshock.
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In today's video, you'll learn exactly how the XZ backdoor works, and the incredible story of how it was discovered by accident.
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It is April 1st, 2024, and you're watching the Code Report.
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Unfortunately, this is not an April Fool's video.
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If you happen to be using one of the Linux distros listed here, you'll want to upgrade immediately.
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Luckily, it only affects a very narrow set of distros, most of which are unstable builds, but that's only because this backdoor was discovered by pure luck early on.
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More on that in just a second, let's first take a deep dive into this backdoor.
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XZ -Utils is a tool for compressing and decompressing streams based on the Lempel -Ziv Markov Chain Algorithm, or LZMA.
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It contains a command line tool that's installed on most Linux distros by default, which you can use right now with the XZ command, but also contains an API library called lib -LZMA,
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and many other pieces of software depend on this library to implement compression, One of which is SSHD, or Secure Shell Daemon, a tool that listens to SSH connections,
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like when you connect your local machine to the terminal on a cloud server.
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Now here's where the backdoor comes in, but keep in mind, researchers are still figuring out exactly how this thing works.
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Malicious code was discovered in the tarballs of LibLZMA, which is the thing that most people actually install.
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That malicious code is not present in the source code, though.
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It uses a series of obfuscations to hide the malicious code, then at build time, it injects a pre -built object disguised as a test file that lives in the source code.
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It modifies specific parts of the LZMA code, which ultimately allows the attacker to intercept and modify data that interacts with this library.
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Researchers have also discovered that any payload sent to the backdoor must be signed by the attacker's private key.
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In other words, the attacker is the only one who can send a payload to the backdoor, making it more difficult to test and monitor.
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And the attacker went to great lengths to obfuscate the code, like it contains no ASCII characters and instead has a built -in state machine to recognize important strings.
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Now, because the vast majority of servers that power the internet are Linux -based, this backdoor could have been a major disaster.
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Luckily, though, a hero software engineer named Andres Freund was using the unstable branch of Debian to benchmark Postgres.
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He noticed something weird that most people would overlook.
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SSH logins were using up more CPU resources than normal.
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Initially, he thought it was an issue in Debian directly, but after some investigation, discovered it was actually upstream in exeutils.
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And that's really bad, because so many things depend on this tool.
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In German, his last name translates to friend, which is fitting, because he single -handedly helped the world avoid a multi -billion dollar disaster. But whodunit?
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Who's the bad guy here?
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At this point, it's unclear.
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The LibLZMA project is maintained by Lassie Collin.
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However, the malicious tarballs are signed by Gia Tan, a contributor to the project.
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This individual has been a trusted contributor for the last few years, but clearly, they've been playing the long game.
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They spent years building up trust before trying the backdoor, and nobody even noticed when they made their move.
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I say they because we don't know if this is an individual or a penetration attempt from a rogue state like Russia, North Korea, or the United States.
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Here's a non -technical analogy.
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Imagine there's a landlord, we'll call him Lassie Collin, who manages a popular apartment building.
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It's a lot of work, but this young, enthusiastic guy has been super helpful over the last couple years, adding all sorts of upgrades and renovations.
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Let's call him Gia Tan.
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He does great work, but he's also been secretly installing cameras in the bathrooms, which only he can access from the internet with his password.
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Now, he would have gotten away with it too if it weren't for a pesky tenant named Andres, who happened to notice that his electricity bill was just a little bit higher than usual.
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He started looking behind the walls and found some unexpected wires that led right to the unauthorized cameras.
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At this point, we don't know the true identity of the hacker, but whoever did this was looking to cast a very wide net, and because it's protected by a secret key, can only be exploited by one party.
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XZ was a sitting duck because it's extremely popular, while also being very boring with a single maintainer.
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Whoever's behind this is either an extremely intelligent psychopath, or more likely, a group of state -sponsored dimension -hopping lizard people hellbent on world domination.
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And that's why the only distro you should use is TempleOS.
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This has been The Code Report, thanks for watching, and I will see you in the next one.
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คำศัพท์และข้อสังเกตด้านการพูดสำหรับบทเรียนนี้
วิดีโอนี้มี 51 ประโยค และ 944 คำ สำหรับฝึกพูดตาม ช่วงที่มีเสียงพูดยาว 4:32 ผู้พูดพูดเร็ว ประมาณ 209 คำต่อนาที จึงมีการเชื่อมเสียงและลดเสียงค่อนข้างมาก มีเพียง 76% ของคำที่อยู่ใน 3,000 คำที่ใช้บ่อยที่สุดในภาษาอังกฤษ คำศัพท์จึงค่อนข้างยาก
คำศัพท์สำคัญในวิดีโอนี้
คำที่พบไม่บ่อย 15 คำจากวิดีโอ พร้อมคำอ่านและความหมาย:
- discover /dɪˈskʌvə/ (คำกริยา) — ค้นพบ. To find or learn something for the first time.
- server /ˈsɝvɚ/ (คำนาม) — เซิร์ฟเวอร์. A program that provides services to other programs or devices, either in the same computer or over a computer network.
- disaster /dɪˈzɑːs.təː/ (คำนาม) — ภัยพิบัติ. An unexpected natural or man-made catastrophe of substantial extent causing significant physical damage or destruction, loss of life or sometimes permanent…
- depend /dɪˈpɛnd/ (คำกริยา) — พึ่ง. To be contingent or conditioned; to have something as a necessary condition
- execute /ˈɛksɪˌkjuːt/ (คำกริยา) — ประหาร. To kill, especially as punishment for a capital crime.
- researcher /ˈɹiˌsɝ.t͡ʃɚ/ (คำนาม) — นักวิจัย. One who researches.
- vast /væst/ (คำคุณศัพท์) — ว้างเวิ้ง, ไพศาล. Very large or wide (literally or figuratively).
- cloud /ˈklaʊ̯d/ (คำนาม) — เมฆ. A visible mass of water droplets suspended in the air.
- wire /ˈwaɪɚ/ (คำนาม) — ลวด, สาย. Metal formed into a thin, even thread, now usually by being drawn through a hole in a steel die.
- hop /hɒp/ (คำนาม) — ดอกฮ็อพ. A plant of species Humulus lupulus, native to northern Europe, female flowers of which are used to flavour many types of beer during brewing.
- string /stɹɪŋ/ (คำนาม) — ด้าย, เชือก. A long, thin and flexible structure made from threads twisted together.
- narrow /ˈnæɹəʊ/ (คำคุณศัพท์) — แคบ. Having a small width; not wide; having opposite edges or sides that are close, especially by comparison to length or depth.
- resource /ɹɪˈzɔːs/ (คำนาม) — ทรัพยากร. Something that one uses to achieve an objective, e.g. raw materials or personnel.
- connect /kəˈnɛkt/ (คำกริยา) — เชื่อม, ต่อ. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
- monitor /ˈmɑ.nɪ.tɚ/ (คำนาม) — จอภาพ, หน้าจอ. Someone who watches over something; a person in charge of something or someone.
การออกเสียงที่ควรระวัง
ผู้พูดใช้รูปย่อและรูปลดเสียง 8 ครั้ง เช่น don't, you'll, they've ให้พูดแบบสั้นตามที่ได้ยิน
- เสียง “th”: enthusiastic /ɪnˌθjuːzɪˈæstɪk/, psychopath /ˈsaɪkəʊpæθ/
- เสียง “sh” และ “zh”: malicious /məˈlɪʃəs/, compression /kəmˈpɹɛʃ.ən/, dimension /daɪˈmɛn.ʃən/, renovation /ɹɛnəˈveɪʃən/, penetration /pɛ.nəˈtɹeɪ.ʃən/
- คำยาว — ลงเสียงหนักให้ถูกพยางค์: contributor /kənˈtɹɪb.jə.tɚ/, electricity /ɪˌlɛkˈtɹɪsɪti/, intelligent /ɪnˈtɛlɪd͡ʒənt/, unexpected /ʌnɪkˈspɛktɪd/, enthusiastic /ɪnˌθjuːzɪˈæstɪk/
วิธีฝึกกับวิดีโอนี้
- ฟังวิดีโอให้จบหนึ่งรอบโดยยังไม่ต้องพูด แล้วจดคำที่ยังไม่รู้จัก
- เริ่มที่ความเร็ว 0.75× พูดตามทีละประโยค แล้วกลับไปใช้ความเร็วปกติเมื่อเริ่มคล่อง
- อัดเสียงตัวเองแล้วเทียบกับต้นฉบับ โดยสังเกตคำอย่าง discover, server, disaster เป็นพิเศษ
ไวยากรณ์ในวิดีโอนี้
โครงสร้างที่ผู้พูดใช้บ่อยที่สุด พร้อมคำพูดจริงจากวิดีโอ:
| โครงสร้าง | ในวิดีโอ |
|---|---|
| Passive voice be + กริยาช่อง 3 — เน้นสิ่งที่เกิดขึ้น ไม่ใช่ผู้กระทำ | was shipped · is unaffected · was discovered |
| Present perfect have/has + กริยาช่อง 3 — เหตุการณ์ในอดีตที่ยังเกี่ยวข้องกับปัจจุบัน | has been · has compromised · have also discovered |
| Relative clauses who / which + อนุประโยค — ข้อมูลเพิ่มเติมเกี่ยวกับคนหรือสิ่งของ | LibLZMA, which is · one who can · friend, which is |
เทคนิค Shadowing คืออะไร?
Shadowing เป็นเทคนิคการเรียนรู้ภาษาที่ได้รับการรับรองทางวิทยาศาสตร์ พัฒนาขึ้นสำหรับการฝึกนักแปลมืออาชีพ วิธีการนี้เรียบง่ายแต่ทรงพลัง: คุณฟังเสียงภาษาอังกฤษจากเจ้าของภาษาและพูดตามทันที — เหมือนเงาที่ตามผู้พูดด้วยช่วงเวลาห่าง 1-2 วินาที การวิจัยแสดงว่าเทคนิคนี้ปรับปรุงความแม่นยำในการออกเสียง ทำนองเสียง จังหวะ การเชื่อมเสียง การฟังเข้าใจ และความคล่องแคล่วในการพูดได้อย่างมีนัยสำคัญ