Веб сайт
Веб сайт Веб сайт - это базовая единица информации в Интернете.

Веб сайт - это отдельный источник информации в Интернете. Обычно, он представляет собой набор веб страниц, посвященных определенной тематике. Страницы пишутся на специальных языках разметки и могут содежрать разлычные типы данных - приложения, аудио и видео файлы, изображения и т.д. Сайт размещен на физическом сервере и может быть найден в Интернете по уникальному имени благодаря DNS. Доступ к сайту, обычно, происходит по протоколу HTTP (hyper text transfer protocol), или же его защищенной версии - HTTPS. Этот протокол позволяет передавать информацию от севрера клиенту, который обычно просматривает страницы с помощью специальной программы - браузера.

  • CM.Glossary.Uptime
  • CM.Glossary.Website Hosting
  • CM.Glossary.DNS
  • CM.Glossary.HTTP
  • CM.Glossary.WebsiteMonitoring
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Shellshock vulnerability check

Considering the recently discovered Shellshock vulnerability, HostTracker has created a tool for testing it.

How does it work?

It is developed for a Linux server with a web server installed on it. The algorithm is very simple. We consequently generate 4 http requests:

  • 1. Ordinary request
  • 2. The request tries, using vulneratility, post a "harmful" cookie which causes 2-seconds delay in respond to our special http request.
  • 3. The request tries, using vulneratility, post a "harmful" cookie which causes 4-seconds delay in respond to our special http request.
  • 4. Same as #3


How to understand the result?

We compare response time for all 4 requests. Three situation are possible:

  • 1. Vulnerability found. We may affirm that if the difference in responses is about 2 seconds for requests without cookie and with 2-second-delay cookie, as well as for requests with 2 and 4-second delay cookie. It means that our request was able to use the vulnerability and set these cookies.
  • 2. Vulnerability not found. All the requests have about the same response time. The cookies, likely, were not installed because there is no vulnerability.
  • 3. Uncertain situation. If the response time differs widely, without coincidence with preset by cookies delay, we can not say for sure. It could be if the server is under high load. To check this, we use two requests with same cookies (#3 and #4). If the response time for two same checks varies, we make a conclusion that the response time is not affected by cookies. At least, not only by them. So in this case our method can not detect vulnerability

 

Safety of checks

 

Our test can not damage your server. The risk consists of appearance of one extra-cookie, which is used only for our requests and can not affect normal work-flow of your site.

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