TRY2HACK wargame level 7
Introduction
Level 5 and Level 6 in TRY2HACK requires the system library in the older version of Window operating systyem. While I'm using a Window 10 is not convenient to execute those two program, I skipped those two levels. (A solution for the incompatible version of operating system is using virtual machine.) These two levels mainly require the correct decompiler and DoDi's Visual Basic 4 Decompiler is quite a good choice.
Level 7
First, the browser check may be the checking of user agent in the HTTP header. There are various tools can be used including OWASP.
If you are using a Google Chrome, search for "chrome user agent" and User-Agent Switcher for Chrome - Chrome Web Store - Google will appear.
After installation, right click on the icon of this extension, select option, and modify the version from 7 to 7.66.
After modifying the version for Internet Explorer, click on the icon of the extension and change to Internet Explorer 7.
Oh! There goes another OS check!
Returning the user agent editting panel, you can see there is a portion of the string containing the information of operating system. Change Windows NT * ti Linux.
Link check can be seen as a check in the field named referer of the HTTP header.
Search for "chrome referer control".
After installation of this extension, right click on the page, select "create referer fliter to the site" and "open option", paste the url of level 7, and select custom to add a referer host.
Success! There comes the link to the next level.
If you are using a Google Chrome, search for "chrome user agent" and User-Agent Switcher for Chrome - Chrome Web Store - Google will appear.
After installation, right click on the icon of this extension, select option, and modify the version from 7 to 7.66.
After modifying the version for Internet Explorer, click on the icon of the extension and change to Internet Explorer 7.
Oh! There goes another OS check!
Returning the user agent editting panel, you can see there is a portion of the string containing the information of operating system. Change Windows NT * ti Linux.
Link check can be seen as a check in the field named referer of the HTTP header.
Search for "chrome referer control".
After installation of this extension, right click on the page, select "create referer fliter to the site" and "open option", paste the url of level 7, and select custom to add a referer host.
Success! There comes the link to the next level.
Conclusion
The techniques needed in this level are
- HTTP header fields
- User-Agent
- Referer