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What's the best way to defend against a path traversal attack?

By : user3851346
Date : October 17 2020, 11:12 AM
With these it helps The following may help. It compares the canonical and absolute paths, and if they differ, then it'll fail. Only tested on a mac/linux system (ie no windows).
This is for the case where you want to allow the user to supply a relative path, not an absolute path, and you don't allow any parent directory references.
code :

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Javascript code snippet to defend against Input stealing attack

By : user2822426
Date : March 29 2020, 07:55 AM
it fixes the issue You are asking for a JavaScript code that would intercept keystrokes in such a way that no other JavaScript code could intercept keystrokes, which unfortunately is impossible because your code would have to be privileged over other code and this is not how JavaScript works.
Keyloggers is a serious problem that cannot be solved at the application layer, especially using JavaScript if the attacker that you are trying to protect from already controls the JavaScript in the first place. Even if you could do it, then you presumably still have to send those keystrokes somewhere and other malicious JavaScript code can intercept it in the transit. There is no easy way to protect against keyloggers. Read the Anti-Keylogger Myths paper by Trusteer for a good start.

defend dos attack

By : user3391317
Date : March 29 2020, 07:55 AM
I hope this helps . my website is crippled due to simple request from many ranges of ips, tens of thousands or more request per second. , Yes.
code :
apt-get install mod-dosevasive

How should one defend against an off-line brute force password attack?

By : user3765685
Date : March 29 2020, 07:55 AM
seems to work fine Encrypt the password file with something strong, then it doesn't matter how the passwords are stored inside the file.
Ie. use something like PGP for transport.

PHP: Recommended way to escape slashes in path (e.g. to prevent directory traversal attack)

By : Georges Moubarak
Date : March 29 2020, 07:55 AM

Python library or technique to defend against timing side channel attack

By : Luiz Oliveira
Date : March 29 2020, 07:55 AM
may help you . I understand what are you really worrying about. You don't want others to know if a user exists or not.
Under single thread structure, it doesn't seem easy to implement. But if you can accept using multiple threads, that could be possible.
code :
async def constant_time_verify_user(time, session, username, password):
    start_time = _time.time()
        ans = await asyncio.wait_for(verify_user(session, username, password), timeout=time)
        await asyncio.sleep(time + start_time - _time.time())
        return ans
    except (asyncio.TimeoutError, asyncio.CancelledError):
        return "Exceed maximum execute time!"
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