steakejjs

il y a 11 ansdiscuss

Lcamtuf notably found several ELF Parsing bugs in file, that appeared may have been exploitable.

The work he has been doing with AFL and googles big fuzz farm, focusing on utilities that are used daily without thought is insanely important, imho

steakejjs

il y a 11 ansdiscuss

The first way I did it was just read the file, parse the json, check for nulls, and print. Then I piped this to a file. That is too boring though.

The next way I did it was with Vim replaces. There might be sexier ways of doing this?

1) A big replace to get rid of all the junk.

    %s/\%Vemail.*creditcard/creditcard/g

2) A big replace to fix nulls in the credit card

    %s/\%V.*creditcard.*null.*//g

Then I could either change my code to not check for nulls or keep cleaning up this data until I have a CSV.

This Vim flow is the exact thing I do every week or two at work when building the Chrome HSTS preload list into our product. Anyone know the sexier ways to make this really really fun?

I should note to those not super familiar with vim that may try this, my vim commands are over a visual block (the json string), since this was in the same file as my code.

steakejjs

il y a 11 ansdiscuss

It might be extremely valuable for Google to prompt you, while riding in your driverless Tesla, to make a stop at a Krispie Kreme on your way home.

steakejjs

il y a 11 ansdiscuss

What if you are an experienced engineer talking to another experienced engineer ?

Seems to me if someone writes bad code when they SHOULD be writing good code, code-shaming might be in order.

I'm all for being nice and understanding. Everyone programs at a different level and I may not write code that is as good as I think, but some code is just obviously bad...and constructive criticism (if willing to be accepted) might help

steakejjs

il y a 11 ansdiscuss

Nginx and net/http has worked wonderfully for me. Nothing fancy is necessary.

steakejjs

il y a 11 ansdiscuss

After reviewing the code it looks like I was wrong. The code from the tutorial won't provide any encryption for your sessions, only integrity.

In order to encrypt the values in the session, rather than just encode you have to do a NewCookieStore([]byte("HMACKey"), []byte("CipherKey")) instead of a NewCookieStore([]byte("HMACKey")). I guess to answer your question, separate keys.

https://gist.github.com/steakejjs/6c17f07c4ca72115bfec

Here's a gist that shows a regular session, created with NewSessionStore([]byte("something-very-secret")) having the value's inside recovered easily.

The strings "foo" and "bar" are pretty easy to spot in the base64 output

steakejjs

il y a 11 ansdiscuss

I actually wrote a tool[0] to attack gorilla sessions that are mentioned at the bottom of this, and gave a talk on some security functions in Go.

The big take-aways from my talk. Go doesn't have a lot of unsafe functions.

HTMLTemplates package and exec package are very resistant to common web attacks, so much so that I had trouble writing vulnerable code to XSS and RCE

As for the tool that attacks Gorilla Sessions, I found a lot of people on github who were not initializing their session securely. Most people in the first 30 pages of github search were doing it wrong. This is most likely a pretty widespread issue. It seems they didn't realize this was an AES key...The blog post is not completely correct saying it will be used for an HMAC. It will...but it is also used as an AES key.

[0] https://github.com/steakejjs/G2B2

steakejjs

il y a 11 ansdiscuss

They are technical.

Brushing up on:

K&R - The C Programming Language

K&P - The Unix Programming Environment

K&P - The Practice of Programming

Kerrisk - The Linux Programming Interface (Not light reading)

Even though it is mostly review, reading code and seeing commands that K&R&P run has actually helped my workflow, code quality, etc.

Highly recommend re-reading if it has been a while. Even things like variable names have noticeably improved since beginning re-reading.

And, the Linux Programming Interface....is huge. There's always more to learn in there.

steakejjs

il y a 11 ansdiscuss

Google has a big fuzz-farm and Project Zero looking for this type of thing and even they did not find Heartbleed years ago. They are nabbing tons of bugs but there are many that are simply buried.

This seems to me a bit like when you do a maze starting from the finish and it is, for whatever reason, trivial to go from one end to the other.

It is neat that it is 2015 and fuzzers are cool again, though.

steakejjs

il y a 11 ansdiscuss

The new stuff happening in the PHP space is really really awesome.

HHVM + HACK + XHP is an entirely different experience compared to writing PHP. Code can actually be very clean and lots of bugs can be found that may have previously gone unnoticed + performance benefits.

Just wanted to say FB is doing an exceptional job with these projects.

steakejjs

il y a 11 ansdiscuss

Sounds like we were always on the same page...

I never said an attacker can't do this. I'm saying an attacker can't do a s/https/http and have a user end up at an HTTP login page, where the attacker can sniff credentials.

steakejjs

il y a 11 ansdiscuss

Relay what credentials from the HTTP connection ? There are none...

It sounds like you are talking about creating a phishing page and injecting it, hoping the user enters their credentials, and stealing them. I already said this was possible.

steakejjs

il y a 11 ansdiscuss

Not all traffic. Amazon has a separate SecureOnly cookie for access to their trusted pages that isn't sent over HTTP. Without that cookie not all traffic can be proxied.

steakejjs

il y a 11 ansdiscuss

Right, but you get a redirect to the https login page with an http login URL.

An attacker can attempt phishing with HTML/JS injection on a HTTP page but an attacker cannot get a user to be looking at Amazon's real login page over http.

I think the problem here is the term ``SSL stripping'' was used and it may be kind unclear what MITM attacks is actually encompassed by it.

The OP wrote ``An attacker can easily steal passwords with SSL Stripping''. If OP meant he can easily steal passwords by basically a s/https/http on all urls on the page, OP's wrong. The attacker needs to create their own fake login page, present it to the victim, and hope the victim falls for it

steakejjs

il y a 11 ansdiscuss

No. SSL stripping is an attack where you prevent a user from upgrading to an HTTPS connection. That isn't possible here.

Many sites have multiple tiers of authentication. For example viewing items to purchase is over HTTP but to actually checkout or manage your account requires you to go to HTTPS and reauthenticate on an HTTPS login page. Always. After this you are kept on HTTPS for the trusted actions. Amazon only does shopping over http but trusted actions are all HTTPS.

This has been amazons authentication scheme for years and it is actually the same as googles (where Google does have http assets, they force a reauth before going to https only stuff).

The most an attacker could do is inject code on http pages, annoyingly add things to cart, purchase items with 1 click purchase (inject javascript that clicks the button) and eavesdrop on all items purchased (quite serious).

BUT they cannot perform SSL stripping if Amazon doesn't do any auth over HTTP. An attacker could do some phishing like attacks to try to convince the user to put their password in at the wrong time, though.

steakejjs

il y a 11 ansdiscuss

What's wrong with being more than one thing. They are shaking up A LOT about how we currently think about the ``energy'' models. I think batteries are going to do wonder for countries that don't have a ``grid''.

The coolest thing to me about Tesla is the car is becoming decoupled from what powers the car. It's still electricity but if my power provider was to switch to nuclear, solar, people on bicycles, or coal It would be transparent to me.

steakejjs

il y a 11 ansdiscuss

I think it would be hilarious to see fictional "failed" historic YC apps, especially those that made it big in their time.

steakejjs

il y a 11 ansdiscuss

I don't understand your issue with hardcoded salts. It essentially works the same way as an HMAC. It is some secret material that further complicates the attackers job...It doesn't mean they react to a successful attack in a different way.

After hashing the password he is storing the hash along with the users random salt, not retroactively applying the salt a second time.

steakejjs

il y a 11 ansdiscuss

I actually think Terry could provide a lot of value if he was able to provide training in system engineering. The experience he has is invaluable. I'm not sure what his plan is, though....

steakejjs

il y a 11 ansdiscuss

In case you're thinking this is THE BUG that should have been released today, I don't think it is. While serious, I saw this on github several days ago. I've also seen two others this week.

This also isn't internet shattering, or whatever. Maybe it's just me but I expect a little more from all the talk about this bug.

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