The ASP.NET ViewState contains a property called ViewStateUserKey [16] that can be used to mitigate risks of cross-site request forgery (CSRF) attacks [4]. Decode a Base64-encoded string; Convert a date and time to a different time zone; Parse a Teredo IPv6 address; Convert data from a hexdump, then decompress . Can you trust ViewState to handle program control? Install $ pip install viewstate Usage. Web1Viwestate . even when the viewStateEncryptionMode property has been set to Never. ASP.NETViewstate. This project is made for educational and ethical testing purposes only. of viewstate MAC failed). Fixed some issues with ViewState in the existing Burp suite. Some examples for .NET are: PSObject, TextFormattingRunProperties and TypeConfuseDelegate. In order to enable ViewState MAC for a specific page we need to make following changes on a specific aspx file: We can also do it for overall application by setting it on the web.config file as shown below: Now, lets say MAC has been enabled for ViewState and due to vulnerabilities like local file reads, XXE etc we get access to the web.config file with configurations like validation key and algorithm as shown above, we can make use of ysoserial.net and generate payloads by providing the validation key and algorithm as parameters. The viewstate for this app seems to be encrypted however -- I can't decode with UTF-8 because it encounters invalid characters (see gibberish characters below), but if I decode with Latin-1 I get something along the lines of this: . to use Codespaces. application. This leads to believe that even if it's not encrypted per se it. What's the difference between Pro and Enterprise Edition? Disconnect between goals and daily tasksIs it me, or the industry? length that limits the type of gadgets that can be used here. Please try enabling it if you encounter problems. This might result in bypassing the anti-CSRF protection Not the answer you're looking for? URLENCODED data is okay ''' # URL Encoding: urldelim = "%" # Check to see if the viewstate data has urlencoded characters in it and remove: if re. Note that the value of __VIEWSTATEGENERATOR is 75BBA7D6 at the moment. Informacin detallada del sitio web y la empresa: g-trapper.com G-Trapper & Partners - Eventi Pellegrinaggi e Allestimenti a BinaryFormatter serializes and deserializes an object, or an entire graph of connected objects, in binary format. Before December 2013 when most of us did not know about the danger of remote code execution via deserialisation issues in ViewState, the main impacts of disabling the MAC validation were as follows (see [8]): At the time of writing this blog post, the following well [1] https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.losformatter, [2] https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.objectstateformatter, [3] https://devblogs.microsoft.com/aspnet/farewell-enableviewstatemac/, [4] https://www.owasp.org/index.php/Anti_CSRF_Tokens_ASP.NET, [5] https://docs.microsoft.com/en-us/previous-versions/aspnet/hh975440(v=vs.120), [6] https://github.com/Microsoft/referencesource/blob/master/System.Web/Util/AppSettings.cs#L59, [7] https://github.com/Microsoft/referencesource/blob/master/System.Web/UI/Page.cs#L4034, [8] https://www.troyhunt.com/understanding-and-testing-for-view/, [9] https://portswigger.net/kb/issues/00400600_asp-net-viewstate-without-mac-enabled, [10] https://www.netsparker.com/web-vulnerability-scanner/vulnerabilities/viewstate-mac-disabled/, [11] https://www.acunetix.com/vulnerabilities/web/view-state-mac-disabled/, [12] https://github.com/pwntester/ysoserial.net/, [13] https://docs.microsoft.com/en-us/dotnet/api/system.web.configuration.machinekeysection, [14] https://docs.microsoft.com/en-us/dotnet/api/system.web.configuration.machinekeysection.compatibilitymode, [15] https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.control.templatesourcedirectory, [16] https://docs.microsoft.com/en-us/previous-versions/dotnet/articles/ms972969(v=msdn.10), [17] https://software-security.sans.org/developer-how-to/developer-guide-csrf, [18] https://github.com/pwntester/ysoserial.net/tree/master/ysoserial/Plugins/ViewStatePlugin.cs, [19] https://github.com/pwntester/ysoserial.net/tree/v2/ysoserial/Plugins/ViewStatePlugin.cs, [20] https://docs.microsoft.com/en-us/iis/get-started/planning-your-iis-architecture/understanding-sites-applications-and-virtual-directories-on-iis, [21] https://github.com/nccgroup/VulnerableDotNetHTTPRemoting/tree/master/ysoserial.net-v2, [22] https://www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2019/march/finding-and-exploiting-.net-remoting-over-http-using-deserialisation/, [23] https://www.slideshare.net/ASF-WS/asfws-2014-slides-why-net-needs-macs-and-other-serialization-talesv20, [24] https://media.blackhat.com/bh-us-12/Briefings/Forshaw/BH_US_12_Forshaw_Are_You_My_Type_Slides.pdf, [25] https://docs.microsoft.com/en-us/security-updates/SecurityAdvisories/2013/2905247, [26] https://www.blackhat.com/docs/us-17/thursday/us-17-Munoz-Friday-The-13th-JSON-Attacks-wp.pdf, [27] https://www.slideshare.net/MSbluehat/dangerous-contents-securing-net-deserialization, [28] https://speakerdeck.com/pwntester/dot-net-serialization-detecting-and-defending-vulnerable-endpoints?slide=54, [29] https://vimeopro.com/user18478112/canvas/video/260982761, [30] https://web.archive.org/web/20190803165724/https://pwnies.com/nominations/, Danger of Stealing Auto Generated .NET Machine Keys, IIS Application vs. Folder Detection During Blackbox Testing, https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.losformatter, https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.objectstateformatter, https://devblogs.microsoft.com/aspnet/farewell-enableviewstatemac/, https://www.owasp.org/index.php/Anti_CSRF_Tokens_ASP.NET, https://docs.microsoft.com/en-us/previous-versions/aspnet/hh975440(v=vs.120), https://github.com/Microsoft/referencesource/blob/master/System.Web/Util/AppSettings.cs#L59, https://github.com/Microsoft/referencesource/blob/master/System.Web/UI/Page.cs#L4034, https://www.troyhunt.com/understanding-and-testing-for-view/, https://portswigger.net/kb/issues/00400600_asp-net-viewstate-without-mac-enabled, https://www.netsparker.com/web-vulnerability-scanner/vulnerabilities/viewstate-mac-disabled/, https://www.acunetix.com/vulnerabilities/web/view-state-mac-disabled/, https://github.com/pwntester/ysoserial.net/, https://docs.microsoft.com/en-us/dotnet/api/system.web.configuration.machinekeysection, https://docs.microsoft.com/en-us/dotnet/api/system.web.configuration.machinekeysection.compatibilitymode, https://docs.microsoft.com/en-us/dotnet/api/system.web.ui.control.templatesourcedirectory, https://docs.microsoft.com/en-us/previous-versions/dotnet/articles/ms972969(v=msdn.10), https://software-security.sans.org/developer-how-to/developer-guide-csrf, https://github.com/pwntester/ysoserial.net/tree/master/ysoserial/Plugins/ViewStatePlugin.cs, https://github.com/pwntester/ysoserial.net/tree/v2/ysoserial/Plugins/ViewStatePlugin.cs, https://docs.microsoft.com/en-us/iis/get-started/planning-your-iis-architecture/understanding-sites-applications-and-virtual-directories-on-iis, https://github.com/nccgroup/VulnerableDotNetHTTPRemoting/tree/master/ysoserial.net-v2, https://www.nccgroup.trust/uk/about-us/newsroom-and-events/blogs/2019/march/finding-and-exploiting-.net-remoting-over-http-using-deserialisation/, https://www.slideshare.net/ASF-WS/asfws-2014-slides-why-net-needs-macs-and-other-serialization-talesv20, https://media.blackhat.com/bh-us-12/Briefings/Forshaw/BH_US_12_Forshaw_Are_You_My_Type_Slides.pdf, https://docs.microsoft.com/en-us/security-updates/SecurityAdvisories/2013/2905247, https://www.blackhat.com/docs/us-17/thursday/us-17-Munoz-Friday-The-13th-JSON-Attacks-wp.pdf, https://www.slideshare.net/MSbluehat/dangerous-contents-securing-net-deserialization, https://speakerdeck.com/pwntester/dot-net-serialization-detecting-and-defending-vulnerable-endpoints?slide=54, https://vimeopro.com/user18478112/canvas/video/260982761, https://web.archive.org/web/20190803165724/https://pwnies.com/nominations/. We will enter the value 'I Love' and 'Dotnetcurry.com' respectively in the two textboxes. scanners should use a payload that causes a short delay on the server-side. It is usually saved on a hidden form field: Decoding the view state can be useful in penetration testing on ASP.NET applications, as well as revealing more information that can be used to efficiently scrape web pages. Since version 4.5 however, it uses the Purpose strings in order to create the hash. Donate today! Its purpose is to persist the state of server controls . + ClientID + __hidden, P3 in P1|P2|P3|P4 in The ObjectStateFormatter class [2] performs the signing, encryption, and verification tasks. This was identified by reviewing the .NET Framework source code [6]. As a result, knowing the targeted applications framework version is important to create a valid payload. If the __VIEWSTATE parameter exists, you can select the ViewState from the "select extension" button in the Message Tab of History. There are two main ways to use this package. and enforce ViewState encryption can still accept a signed ViewState without encryption. Though it is not difficult to decode is and read the view state information. In the case . ASP.NET View State Decoder. The Burp Suite Extender can be loaded by following the steps below. Catch critical bugs; ship more secure software, more quickly. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Note that for uploading a new package version, a valid PyPI auth token should be defined in ~/.pypirc. Free, lightweight web application security scanning for CI/CD. parameter can be empty in the request when exploiting the __EVENTVALIDATION parameter but it needs to exist. As mentioned previously, So encoding and hashing is done before the request reaches server. Making statements based on opinion; back them up with references or personal experience. Invalid ViewState The enterprise-enabled dynamic web vulnerability scanner. See [13] for more details. I hope to see further You are correct. Generate a payload with ysoserial that will ping my host, and the known good ViewState with that in the script. Fixed some issues with ViewState in the existing Burp suite. PortSwigger Dastardly-Github-Action: Runs a scan using Dastardly by Burp Suite against a target site and creates a JUnit XML report for the scan on completion. or docker pull 0xacb/viewgen. ASP.NET decides Developers assume no liability and are not responsible for any misuse or damage caused by this tool. ViewState Editor is an extension that allows you to view and edit the structure and contents of V1.1 and V2.0 ASP view state data. You can install BApps directly within Burp, via the BApp Store feature in the Burp Extender tool. base64 string in the __VIEWSTATE parameter. Download FREE Trial Even if the web.config file is compromised by any other vulnerability e.g. mechanism that has been implemented by setting the Page.ViewStateUserKey Ensure that custom error pages are in use and users cannot see Cisco Bug IDs: CSCvc76634. For instance, the xaml_payload variable in the TextFormattingRunProperties Contact Us, Latest Changes A tag already exists with the provided branch name. Since there is no publically available specification of how .NET viewstate is encoded, reverse engineering was based on prior work: Any official documents would be gladly accepted to help improve the parsing logic. viewstate - ASP.NET View State Decoder. previously, this is the default configuration for all .NET Framework versions yuvadm/viewstate. An example. Thanks for contributing an answer to Stack Overflow! Here is the source code for a ViewState visualizer from Scott Mitchell's article on ViewState (25 pages), And here's a simple page to read the viewstate from a textbox and graph it using the above code. be all in lowercase or uppercase automatically. Once the generated value of the __VIEWSTATEGENERATOR matches the one present in the web applications request, we can conclude that we have the correct values. property has been set to Always. Expand the selected tree. search (urldelim, data): d1 = urllib2. Microsoft .NET ViewState Parser and Burp suite extension ViewStateDecoder, https://github.com/raise-isayan/BurpExtensionCommons, https://github.com/google/gson/blob/master/LICENSE. It is normally possible to run code on a web server where a It is intended for use with Burp suite v2020.x or later. We wrote a sample code to create a serialized input using LOSFormatter when the application loads. section of the configuration files (web.config or machine.config) been provided. property has been used, the page would not ignore the errors, and without ASP.NET ViewState Decoder Decode the ASP.NET ViewState strings and display in treeview format. The following tools were also released coincidentally at the same time as I was about to publish my work which was quite surprising: I think these tools currently do not differentiate between In case there are any remaining bytes after parsing, they are assumed to be HMAC signatures, with the types estimated according to signature length. Additionally, they do not use the ViewStateUserKey The __VIEWSTATE parameter can be encrypted in order to Build a script that can encrypt the known good ViewState and submit it. I have created the ViewState YSoSerial.Net plugin in order to create ViewState payloads when the MAC validation is enabled and we know the secrets. This worked on an input on which the Ignatu decoder failed with "The serialized data is invalid" (although it leaves the BinaryFormatter-serialized data undecoded, showing only its length). unquote (data). The following shows the machineKey sections format in a configuration file of an ASP.NET application that uses .NET Framework version 2.0 or above: In the past, it was possible to disable the MAC validation simply by setting the enableViewStateMac property to False. Decrypt the ViewState variable to show my encryption key works. In case there are any remaining bytes after parsing, they are assumed to be HMAC signatures, with the types estimated according to signature length. I answered a similar question recently, Getting values from viewstate using JQuery?. at the time of writing this blog post. This extension is a tool that allows you to display ViewState of ASP.NET. This means that in the latest .NET Framework versions the decryption key and It does look like you have an old version; the serialisation methods changed in ASP.NET 2.0, so grab the 2.0 version.
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