> For the complete documentation index, see [llms.txt](https://sec88.0x88.online/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sec88.0x88.online/web-appsec/asp.net-security-testing.md). # ASP.NET Security Testing ### Reference {% embed url="" %} ### ASP Fuzzing * Extensions. ```textile Xml Txt Zip 7z Dll Ashx Asmx Svc HTML HTM JS JSON ``` * Headers. ```http Cookie: User-Agent: Accept: */* ``` * Example Findings ``` Api.zip Wwwroot.zip Bin.7z Web.dll Login.htm Accesses.txt appsettings.json UploadHandler.ashx File_Manager.asmx Service1.svc ``` * Tools * FFUF ```bash ffuf -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -u https://target.example/FUZZ -D -e .php,.html,.bak -t 40 ``` * [**fuzzuli**](https://github.com/musana/fuzzuli)
``` go install -v github.com/musana/fuzzuli@latest echo https://fuzzuli.musana.net fuzzuli -p echo https://fuzzuli.musana.net|fuzzuli -mt shuffle echo https://fuzzuli.musana.net|fuzzuli -mt regular echo https://fuzzuli.musana.net|fuzzuli -mt withoutdots echo https://fuzzuli.musana.net|fuzzuli -mt withoutvowels echo https://fuzzuli.musana.net|fuzzuli -mt withoutdv echo https://fuzzuli.musana.net|fuzzuli -mt reverse echo https://fuzzuli.musana.net|fuzzuli -mt all ``` ### Critical ASP Paths Often Overlooked by Pentesters. ``` /OBJ/Debug intitle:"index of /obj“ APPname.dll, APPNAME.FUZZ.dll Web.dll, WebConfig.txt, Web.xml *.DLL *.TXT *.XML /XML/ FUZZService.EXT|AppNameService.EXT|AppName.EXT Login.asmx, admin.asmx, FileTransferService.svc FUZZ /XML/ with XSL EXT /xml/SupportAuth.xsl *.XML *.XSL *.ZIP /WebServices/ Config.xml, Export.zip, Login.XSL SUPPORTTOKENINTERNAL on SupportAuth.aspx *.ASMX *.SVC ``` ### Abusing ASP.NET\_SessionId for Unauthorized Access. ```bash /Backup/ 403 Web.config =anonymous UnAuth ASP.NET_SessionId=X ≠ anonymous /backup/ 200 -------------------- /UsersInfo.ashx 302 if (Request.Cookies[".ASPXAUTH"] = null UnAuth .ASPXPath=X if (Request.Cookies[".ASPXAUTH"] != null /UsersInfo.ashx 200 --------------------- # Scenario 1. /Hdownload.ashx -> 302 2. /Login.aspx -> .ASPXPATH= (cookie parameter) 3. /Hdownload.ashx + .ASPXPATH= (cookie parameter) -> Bypassed ``` ### Bypassing WAFs with ASP.NET Cookieless Sessions. * Bypass WAF-Blocked Endpoints Using (S(x)) ```bash 1. GET /admin/login.ASPX 2. The WAF only allows internal IPs to access the endpoint. 3. GET /admin/S(X))/login.ASPX --> 200 OK ```
### Uncovering Secrets in ASP.NET JS Files. * Fuzzing For JS On ASP.NET ``` / /js /Javascript /include ``` * Critical JavaScript Filenames On ASP.NET ``` appsettings.js Config.js debug.js service-worker-assets.js ``` ### Breaking Auth with Unique Path Manipulation.
--- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://sec88.0x88.online/web-appsec/asp.net-security-testing.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.