Hacking IIS Applications

Resources

https://youtu.be/XlmeSFm3RT4?si=hfhzGF9ymG6Igt5j

https://www.youtube.com/watch?v=cqM-MdPkaWo

https://www.youtube.com/watch?v=yyD8Z5Qar5I

https://www.youtube.com/watch?v=_4W0WXUatiw

Soroush Dalili (@irsdl) Blog | A web application security ninja 🥷, a semicolon enthusiast!

Exploiting Deserialisation in ASP.NET via ViewStateSoroush Dalili (@irsdl) Blog

Microsoft IIS Server Shortnames & Tilde Magic 🪄Medium

ASP.NET Microsoft IIS PentestingMedium

https://book.hacktricks.xyz/network-services-pentesting/pentesting-web/iis-internet-information-book.hacktricks.xyz

HTTPAPI 2.0 Assets

• Got HTTPAPI ERROR 404

• It is IP but you can get the subdomain from the certificate common name

• Edit the Host Header

  

VHost Hopping

• Came across subdomain that running IIS Server apply.company.com

• VHost Enumeration using ffuf or burp intruder

• Found mssql.company.com

• Running MSSQL Explorer/Manager

Local FIle Disclosure to DLLs

• DownloadCategoryExcel?fileName=../../web.config

• DownloadCategoryExcel?fileName=../../glopal.asax

• <add namespace="Company.Web.Api.dell/>

• DownloadCategoryExcel?fileName=../../bin/Company.Web.Api.dll

LFD -> RCE

• https://bit.ly/2MzJ1qI
• Optain machinekey from web.config file (validation key and decryption keyy)

• VIEWSTATE -> Insecure Deserialization -> RCE

• https://github.com/0xacb/viewgen

RCE with Local

Exploiting XXE with local DTD files

ASP.NET XSS

All is XSS that comes to the .NETisec_pl

• Try in login pages, redirects, forms & dynamic URL construction (~/images/). Payload: /(A(%22onerror='alert%60123%60'test))/

DNSpy

• Found Leaked zip files contains DLL Files?

• https://github.com/dnSpy/dnSpy
• Use DNSpy to reverse them to source code

• or https://www.jetbrains.com/decompiler/

IIS Discovery Bruteforce

• iisfinal.txt
• https://github.com/orwagodfather/WordList/blob/main/iis.txt
• https://raw.githubusercontent.com/danielmiessler/SecLists/master/Discovery/Web-Content/IIS.fuzz.txt
• http://itdrafts.blogspot.com/2013/02/aspnetclient-folder-enumeration-and.html
• https://github.com/digination/dirbuster-ng/blob/master/wordlists/vulns/iis.txt
• https://raw.githubusercontent.com/danielmiessler/SecLists/master/Discovery/Web-Content/SVNDigger/cat/Language/aspx.txt
• https://raw.githubusercontent.com/danielmiessler/SecLists/master/Discovery/Web-Content/SVNDigger/cat/Language/asp.txt
• https://raw.githubusercontent.com/xmendez/wfuzz/master/wordlist/vulns/iis.txt
• ffuf -w iis.txt -u https://example.com/FUZZ
• ffuf -w iis.txt -u https://example.com/shortnameFUZZ

Partial Fuzzing

• shortscan https://apply.company.com/

• IIS Short Name Scanner

  • Explore the latest version on GitHub.
• Got a part of file names not the full name ? let's fuzz the rest

• LIDSDI -> LIDFUZZ | EASYFI -> EASYFUZZ

• ffuf -w wordlist.txt -D -e asp,aspx,ashx,asmx -t 100 -c -u https://apply.company.com/lidsFUZZ

• You can make your own wro=dlist using wordlist generator https://sourceforge.net/projects/crunch-wordlist/ https://github.com/jim3ma/crunch
• ./crunch 0 3 abcdefghijklmnopqrstuvwxyz0123456789 -o 3char.txt

• Fuzzing doesn't work? try search in Github or use https://github.com/retkoussa/gsnw

Nuclei

Check out the Nuclei templates for fuzzing techniques.

Fingerprinting with Shodan

Utilize Shodan to identify IIS instances with specific characteristics:

• http.title:"IIS"

• Ssl:"Company Inc." http.title:"IIS"

• Ssl.cert.subject.CN:"company.in" http.title:"IIS"

Fingerprinting Techniques

Cookies

• ASP.NET_Sessionid

• ASPSESSION

Headers Regex

• X-AspNet-Version: (.*)\\;version:\\1

• X-Powered-By:^ASP\\.NET

HTML Regex

• <input[^>]+name\"_VIEWSTATE

URL Regex

• \\.aspx?(?.$|\\?)

Ignoring Directories from Scanning

Exclude these directories from your scans:

• ASPNET~1

• DEFAULT~1.ASP

• DEFAULT~1.CSS

• GLOBAL.ASA

• GLOBAL.ASP

• GLOBAL.CS

• MASTER.CS

• WEB.CON

Extensions to Bruteforce

Bruteforce file extensions to uncover vulnerabilities:

• .aspx (Legacy active server pages)

• .aspx (Modern Active server pages)

• .ashx (APIs/AJAX)

• .wsdl (Web Services Description Language)

• .wadl (Web Application Description Languages)

• .asmx (XML Web Services)

• .xml

• .zip

• .txt

Port Scanning

• naabu -host iis.target.com