My C/ASM is rusty, but Matt is doing a great job at refreshing my memory as you go along. John, too, is an intuitive pair-programmer. I've always wanted to know how to turn a "buffer overflow" vulnerability into an exploit, mostly out of frustration at hearing so much about them in college but never actually being shown how one works. Such a great video!

Great watch for anyone who is new to ret2lib. On getting the address of /bin/sh string (1:07:46) Loading the libc.so.6 into Ghidra will work, but it was imported with a base address of 0x100000, which John didn’t subtract from the address of the string, (a mistake he attributes to a typo later). An easier approach would be to use strings -tx libc.so.6 | grep /bin/sh

@CMorlandBassist

3 жыл бұрын

Thanks for explaining this. I also noticed it wasn't a typo, but wasn't sure how ghidra could say it's address started at 0x2B when it was really 0x1B. Do you know why it had a base address of 0x100000?

@apjohnite1302

3 жыл бұрын

@@CMorlandBassist No idea, but it usually defaults to that for an executable with PIE set. There is an option to override the base address when you import.

@jmiguelhernandez1640

Жыл бұрын

thanks, i was wondering if string had an option for that. i found the memory map window in ghidra not only makes clear what base is used but it lets modify it as well.

Loved this John, definitely consider doing more of these please. I kept up with what was going on probably up until about 1hr 25 mins. I can feel a rewatch coming on!

I was watching this on the TV so I really appreciate that you strive to make sure everything was large enough. Thank you! Amazing video. Want to see more with Matt!!

What an incredible video. I've been meaning to watch for this for days and finally set up a time for that. Everything in detail, amazing. Thanks for the content.

Yes please do more of this! Amazing learning content, even more so than usual IMO. Great stuff!

It's been ages since I last subscribed to someone. But if you make a video this awesome, it can't be help. Thanks for making this you guys! Would love to see more

Thanks for this! I still can't do what was shown on my own, but I'm about 4 steps closer than before I watched it. Learned a ton.

Amazing content, really hope there is more like this. Would also love to see some of the more advanced stuff. As Matt said, it's very difficult to find unless you are paying for it.

I would love to see you and Matt do more colabs in the future!

@Hyuntube996

3 жыл бұрын

Yeah man 🙃

@charlesmctavish5188

2 жыл бұрын

Yeah very knowledgeable and has clear explanations. Great teacher

Ngl that was 2 hours and 12 minutes well spend. Very interesting and cool

Awesome aspect of the videos, like the format and the dialog!

This was absolutely great, thanks John and Matt !

in case anyone is wondering, the offset error for "/bin/sh" string wasn't a typo. When it was taken from ghidra, ghidra loaded the lib with a base address of 0x100000 so it was off by that much. 0x2B40FA-0x100000 = 0x1B40FA

These guys are awesome, surprisingly I understand every step!!! Great video.

I always learn or recall something. I'm "hooked" on Your videos! Thank You for sharing!

Amazing video! I learned a ton. Please, please, please make more of these!!!

Great video, Matt and John. Thanks for putting that together. Go Tigers!

There was a lot in this one. Will have to come back to this multiple times. Thanks a lot for this!

This was gold. Its always so useful seeing mistakes and debugging. I still don't understand everything that was discussed, esp stack alignment, but i know more than i did when i started watching. thanks guys! Oh one thing. Who is Matt? would be good to get a link to any content he has :)

You're the gold mine fr thank you so much for the content we all appreciate your hard work❤❤🎉😊

Really good video to start. I really wanna more of this videos, better with Matt, he explains really good.I am gonna re-see a lot of times, get notes and search throught internet all of this.

This was amazing and so informative! Please do more binary exploitation videos with Matt

Setting up the tools may often become the most interesting part of the event. Whatever, I'm ten minutes in, and I'm so excited!

You helped me through my night shift at McD, never enjoyed them more! (:❤️

I found my video for the weekend. Thanks John.

I am actually grateful that you didn't capture audio at the beginning because the setup of tools isn't so important and we could still enjoy it in a sped up version.

Thank you guys. That was great.

yes sir more video like this and you just do a fab work again! thanks is all i just got for you sir. Thank You !!!.

Lads: this. was. AWESOME! Matt's a natural-born, superb teacher; John you asked great questions and dropped in very useful clarity points and made me feel like I was Matt's student sitting right there as this lesson developed. 2 hours absolutely flew by and I have so much more nuts&bolts knowledge thanks to you two. 👏

Great video. So much foundational stuff, please bring this guy back!

Thanks to both of you legends

Yes! more of this please John!

So good! Thanks very much!

Really great! A+ I would definitely watch more like this

Very educational, amazing video!!

This was an incredible video. VERY educational. More of these, please :) Now I want to be Matt when I grow up..

@marcovalentinoalvarado3290

3 жыл бұрын

Also I recommend you another hacker with a youtube channel called "Kindred Security" he teaches as well how to bypass security measures for binary exploitation

That was the best tutorial on rop and ret2libc I have ever seen. By far!

Such a morale boost to see better people than me screws up and have to hunt down bugs, great video ! :)

That was awesome! I learned a lot, thank you. Very helpful how you went through the full debugging process and also prompted some really great questions. Nice work.

Greate video John very big fan hope to see more videos like this soon.

Hey John rbx here, glad you are taking the journey with binary exploitation quick tip for finding that "/bin/sh" address using strings itself strings -a -t x path2libc | grep "/bin/sh"

Awesome video as always. Just wanted to note that the /bin/sh address bug came from the fact that you copied the address offset from ghidra which, by default, will not load in binaries with a default base address of 0x00000000. You didn't typo! :p

Matt is one of the most brilliant person I have ever heard in computer science field yet x)

you have to keep going with this, AMAZING video learned so much and i solved this ctf by my own yesterday tho lol.. STILL learned a lot !!

Awesome video guys !

Thank you matt and john!!!

Very interesting, please do more!

I honestly didn't understand a shit but I loved the amount of structural content I learned, and how the channel works in general, thanks for the information! Im learning a lot :D

This saved my day, and could be a few more days reading into more confusions

This is a gem John!

How did I miss this goldmine of a video before? Got here from the new vid of Binary Exploits :3

Awesome work guys !!

Holy crap that was a ride for a noob like me. Thanks so much!

Thank you for sharing.

This guys really good at breaking stuff down! It was still a little advanced for me but still really enjoyed it

Had been waiting for this

Any good reading material on the why I need to use pop_rdi and specifics? Replicating the success of this but Im kind of wondering about the why. Only have done shell code ones on windows(ecppt).

Yes, more of these!

wow amazing content learned a lot

John Hammond is one of the most likeable people on the internet. Great work man.

Awesome video!! Please do more RE

This is such a cool video! Could you just make a video tutorial on every section of the ShellCoder’s Handbook? 😂

Hi John, im just getting into Binary Exploitation and I would like to ask about the terminologies and how they work. For now what does the off-set do? I have seen it beeing used multiple times in different avenues of the video. Awesome educational video! Cheers

ret2libc ctfs is where i struggle so thank you so much for this. I will be using this for practise so i would be so happy if you could catogorize the video so i could jump places that would be AWESOME

This was hell of a good video. Do that again with a more complex binary exploitation!

Great video! You and Matt make a great pair of teachers. I wanted to join your discord server but I don't think the link is working. The rest of your website works though :)

1:48:37 its the "relative path vs absolute path. this is that move back path. Sort a like when your properly referencing folders in your program, like a header file.

Amazing explanation !!!

That first 10 minutes had my head spinning 😵‍💫 I got completely lost

I loved this. Btw readelf -W won't truncate the symbol names.

please when you do one of this videos make both persons voice equal i had to keep my hand on the volumes key entire time and add subtitles other than that thank you so much

Well done John and Matt. Although I've been doing these for a while, I still managed to learn new things. For next time, try to add one gadgets ;)

13 months later, still amazing. It's funny that when this released none of it made sense to me but it's been a crazy year. Matt and John thanks for taking the time to explain in such awesome detail.

@biblemansings

Жыл бұрын

Did you learn at school?

@biblemansings

Жыл бұрын

I’m just starting my Cyber Security courses

@cXedis

Жыл бұрын

@@biblemansings not exactly? 20 years in IT, also BHIS has "Pay What You Can" classes you take for free. I have no formal edjumication in the field beyond those classes. I make my way by googlfu and a head that's sturdy enough to eventually break thru most walls...eventually.

@andresjoelrodgers

Жыл бұрын

@@biblemansings ❤

@andresjoelrodgers

Жыл бұрын

🎉

Very cool video thank you! Although if you don’t mind, could you please edit the audio a little. You were really load while the speaker is almost indistinguishable. So when he talks I increase my volume, but then your comment comes in and my ears start bleeding. Otherwise very cool content!!

A very nice video, but you guys made some comments that I didn't really understand. Why do null bites spook you, for example?

i really liking you stoff btw so i can learn more

Really enjoyed the video and picked up some good notes, however if that was "basic", I think I need to search for the "ba" lessons :)

That was very insightful and interesting. Too bad the sound levels were very uneven. Still, thanks for sharing!

thanks bro

Thank you bro

What is your OS of choice John?

Super interested in binary exploitation and the lower-level hacking that's more closely related to hardware elements of hacking. I'm happy this exists.

That was great but I feel like Matt was too quiet compared to you, and when I heard you loud and clear sometimes I had problems with Matt. But overall love the vid. I feel like I'm going to return to it frequently

thanks fot your hard work! this videos are gold! just hope to technology used for the good of humanity...

Wow. Mindblown

Friday night in lockdown…. COVID is getting me into hacking. Your videos are amazing!

This is gold mate

does Matt also have a channel? I would love to check his channel to if he does youtube videos ;) this is gold for someone who just has basic knowladge and is trying to learn more :)

Wow this was fun, reminds me of stepping through softIce in 1990's to crack hobbled programs, sitting down with reems of printer print out and a pen, working through by hand. Oh things were so much simpler back then.. And ida pro was freeware.. The only Advantage now is you don't have to go to library or wait an eternity to download a program

Really really cool

6:39 This is like chroot jail? 10:08 wasn't configuring the chroot jail to work with dynamic linker reverse engineering and exploiting the vulnerability. Or like if any other script would have been the demo but since scope was vulnerable script is said differently? Cause that config make was rather epic. 12:12 Again very good information. That is pretty much the whole show - isn't it? Can libc be used to create a static chat history for interacting with generative ai? like how its stateless could pointer be created and just redirected to libc iteratively?

Super hype!

Do more videos with him!!

Where are the time stamps?

he knows everything about that he's smart on revers engineering I like it wooow

Morning all.

congrats on 420k

why do we need to use /bin/sh that's inside libc? and why _is there_ that string inside it?

@robertsteffler5155

2 жыл бұрын

Basically the whole goal here is to get the binary *itself* to give us shell (that's what /bin/sh) is, and the binary, being an ELF file written in C comes prepackaged with a collection of built-in functions called libc (basically the library of all *c* in-built functions, hence *libc*). Inside of libc is at least one /bin/sh call, because that's what the *system* library uses to actually perform system operations. All we're doing is stealing that functionality and calling it without any other arguments to tell the vuln executable, essentially "Hey, once you're done doing what you're doing right now, I want you to use the system function from libc, and have it just dump us into a shell". The reason we do this at all is because once we have a shell.. we're in. We're jumping around on their system.

@jaopredoramires

2 жыл бұрын

wow, thank you so much for the explanation

1:55:30 ~ish, what terminal emulator is Matt using? My pleb brain needs to know.

@kitsugi3020

3 жыл бұрын

looks like default gnome term with zsh