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webgoat – What is happening to second response in HTTP Splitting?

Doing the webgoat HTTP splitting exercise. I feel like I’m doing something wrong or there is something that I don’t understand.

The idea is that since we can control the referer parameter, we can split the request into 2 and have the server sends us another response (This could later on be used to trick victims into caching our 2nd response with the expires parameter).

The thing is: I am not seeing anything. On the browser or on Burp suite.

I am trying the following payload (By intercepting the POST request after clicking “Search!” and replacing the sent string inside the html form box with the following):

test%0aContent-Length:%200%0a%0aHTTP/1.1%20200%20OK%0aContent-Type:%20text/html%0aContent-Length:%2017%0a<html>pwnd</html>

On Burpsuite I see the 302 and the following 200 with the payload appearing at the end of the path and that’s it. Supposedly based on what I am reading on the solution tab, I should be redirected to a site with the html I injected.

Any idea what I might be doing wrong or what’s happening?

nikon – Is this just chromatic aberration? Or is something else happening in these photos?

The primary reason both images look blurry is because in both of them the point of sharpest focus is closer than most of the scene. Shooting with a wide open aperture minimizes depth of field, so things not at the focus distance get blurrier and blurrier fairly noticeably as they are further behind or in front of the focus distance.

In the first image the sharpest area is the junction of wires at the far right center. Since the top wire, upon which the squirrel is running, appears to move away from the camera position the further left in the frame it goes, it quickly become blurry enough to be noticeable. Everything behind it will be even blurrier.

In the second image, the twigs in the foreground on the right are the most in-focus part of the photo. But even there, it seems the actual focus distance was just in front of or just behind them. Everything in the background is well behind the focus distance.

Most of the highlights in both images show vertical and horizontal diffraction spikes. These could be easily explained by shooting through a mesh screen that has wires running vertically and horizontally. It’s more noticeable in the top image because there are more highlights and they are brighter than the highlights in the second image. Diffraction affects not only the highlights, though. It also affects the darker parts of the image. Light passing very near to objects like aperture blades or wires in a mesh screen will be scattered by the obstructions. This is because of the wave nature of light’s energy.

Here’s what looking through a very fine screen at a single pinpoint of laser light looks like.

enter image description here

Now imagine that there are millions of pinpoints of light on the other side of the screen and the scattered patterns from all of them are overlapping each other. That’s what is going on in your photos.

google sheets – Getting the latest date of something happening (with conditions)

So basically, I’ve got two sheets. One (sheet_1) with every single record in the system (over 11000 rows) and the other one (sheet_2) is querying information from that sheet. The relevant information to know is that sheet_1 has 3 columns of interest to me; name of person, thing he/she did and the date he did it. Now in sheet_2, I’m attempting to create a sort of report about that person, showing all information from sheet_1 that is relevant to that person.

I’ve made sort of a statistics section in sheet_2 which shows the incident type, number of times its happened and when was the last time it did happen. What I cant figure out is how to do the “when was the last time it did happen” column.

My first thought was an if function but that didn’t work since there was no logic there, so ill give you a more clear explanation of what should happen in the cell:

Cell is supposed to first check the type of incident and the name of the person (both in sheet_2) then cross reference that with sheet_1 and get the “maximum or latest date” for that type of incident for that specific person.

Strange graphical glitches randomly started happening

I’m not sure what’s caused it. I haven’t changed any system settings. The only thing I’ve done that may have broken something is updating my software.

It was far worse before, I’m not sure how to describe exactly, but my entire screen’s UI was glitching out. So I rebooted and that stopped, but now the terminal text looks like this:

glitched terminal text

I haven’t changed any terminal settings. This seems to be occurring in the entire OS.

Not sure how to go about troubleshooting this? I don’t have the time to reinstall the OS, nor do I think I should have to because this is just ridiculous and shouldn’t happen. I’m not aware of anything I’ve done to make the system unstable.

Environment

  • Ubuntu 20.04.2 LTS
  • GNOME 3.36.8

Let me know if more details are required.

sql server – Table scan instead of index seeks happening when where clause filters across multiple tables in join using OR

Firstly, thank you for providing the actual execution plans for both cases, that is one of the best things for us to help troubleshoot performance problems.

Secondly, the issue you’re facing is due to the difference in Cardinality between the first query and second query, which in a few words is the number of records your query might return relative to how many records are in the tables themselves, for the predicates (conditions in the JOIN, WHERE, and HAVING) specified.

When SQL Server analyzes your query, its Cardinality Estimator uses statistics the server stores about the tables involved to try to make a reasonable estimate on how many rows will be returned from each table in your query. Then it the execution plan is generated based on this information, as different operations are more efficient in different situations with different amounts of rows to be returned.

For example, if your query results in a high Cardinality (lot of records being returned), generally an index scan is a more performant operation than an index seek because there is a higher likelihood the index scan will encounter a majority of your records sooner than it would’ve trying to seek out each one individually.

Sometimes the Cardinality Estimator gets confused based on the conditions in your predicates causing it to misestimate the cardinality resulting in performance issues. One way to very you have a cardinality estimate issue is by comparing the Estimated Number of Rows to the Actual Number of Rows in the actual execution plan. If they are off by a significant amount (e.g. a magnitude or more) then likely there’s a cardinality estimate issue.

Finally, sorry to get your hopes up, but your execution plans don’t seem to be indicative of a cardinality estimate issue. It does seem to be your second execution plan is estimating the cardinality correctly, and it truly is a case where the conditions of your WHERE clause truly result in enough rows for SQL Server’s engine to think an index scan operation will be more performant here than an index seek. As you’ll notice both your Estimated Number of Rows and Actual Number of Rows in your second execution plan are now about 1.5 million rows.

That being said, even with accurate statistics and cardinality estimates sometimes the engine is just plain wrong. You can test this by using the FORCESEEK index hint which in your query’s case would be appended after the table like FROM T1617 WITH (FORCE SEEK), for example. Fair warning, index hints are only recommended for use in production code with extended testing, as when used incorrectly can lead to worse performance. But FORCESEEK is a relatively benign one when appropriately used, and can help correct some uncommon cases where the engine is wrong about which operation will be faster.

sql server 2012 – I can’t identify what is happening in this table with a PDF on it

I have a table with this config:

enter image description here

Now if you look at COLUMN_11, it is a varchar -1.

But as far as I know, to insert a PDF file into a table, you need filestream, and the column should be VARBINARY(max) right?

so, how is this working? why is there a PDF in a VARCHAR column?

the DocumentBody is this:

enter image description here

Obviously theres millions of this one.

❕NEWS – There is a major increase in bitcoin purchases happening over the counter | Proxies-free

At the current price that bitcoin is at, one would expect that the number of people that buying bitcoin will be quite low, as the high prices may deter people from investing. In fact it is always best to wait for a price reduction before buying crypto. However, this does not seem to be the case. A recent article that was published on Coindesk has shown that the number of purchases of bitcoin over the counter has risen steeply. The possible reason for this purchase of bitcoin over the counter is to try and reduce the impact that this has on the crypto exchanges and the market for the bitcoin currency. According to the CIO at coindesk this shows that there are new investors that are trying to buy into the crypto investment market and are doing so consistently.

unity – Why Sorting process not happening?

I created 10000 array and assign value 1 and 0 to it, then using gizmos to generate 10000cubes, paint it with black and white depend on the assigned value. After that I using the bubble sort algorithm to sort the cubes, expecting all black cubes pilled on the bottom but as I run it, the sorting does not happen and I couldn’t spot where my mistake.

using UnityEngine;

public class NewBehaviourScript : MonoBehaviour
{
int x;
int y;
int z;

int(,) array1 = new int(100, 100);
int temp;
// Start is called before the first frame update
void Start()
{



    for (x = 0; x < 100; x++)

    {
        for (y = 0; y < 100; y++)
        {
            array1(x, y) = Random.Range(0, 2);

            Debug.Log(string.Format("{0},{1},{2}", x, y, array1(x, y)));

        }
    }
    OnDrawGizmos();


}
void OnDrawGizmos()
{
    
    for (x = 0; x < 100; x++)
    {
        for (y = 0; y < 100; y++)
        {
            Vector2 pos1 = new Vector2(0 + x, 0 + y);
            Gizmos.DrawCube(pos1, transform.position);
            Gizmos.color = (array1(x, y) == 1) ? Color.black : Color.white;
        }
    }
}

void update()
{
    for (z = 0; z < 100; z++)
    {
        for (x = 0; x < 100; x++)
        {
            for (y = 0; y < 100 - z; y++)
            {
                if (array1(x, y) > array1(x, y + 1))
                    temp = array1(x, y);
                array1(x + 1, y) = array1(x, y);
                array1(x, y) = temp;

            }
        }
    }
    OnDrawGizmos();
}

}