for all files) recurse: toggles recursion on (default: off) prompt: toggles prompting for filenames off (default: on) mget: copies all files matching the mask from host to client machine (Information from the manpage of smbclient) Read Registry Creates a remote directory using the CIFS UNIX extensions with the given mode. Note that the server name required is NOT necessarily the IP (DNS) host name of the server ! command string is a semicolon-separated list of commands to be executed instead of prompting from stdin. If the receiving computer is running WinPopup the user will receive the message and probably a beep. Anonymous logins are oftentimes extremely helpful when accessing remote systems during a pentest, but we should make sure to squeeze as much information out of the target as we can. – EH-Net Live! or For example: smbclient -M FRED < mymessage.txt will send the message in the file -c. This is particularly useful in scripts and for printing stdin to the server, e.g. By Jeff Georgeson Your organization will get compromised! Level 1 is a reasonable level for day-to-day running - it generates a small amount of information about operations carried out. easy parseable output that allows processing with utilities such as grep and cut. For details on the use of NetBIOS scopes, see rfc1001.txt and rfc1002.txt. In Figure 3, we attempt again to connect anonymously, again using smbclient. The default configuration file name is determined at compile time. tarmode -I -R|--name-resolve is specified, the ! -m|--max-protocol protocol Note that the driver files should already exist in the directory returned by getdriverdir. The linkname file must not exist. In detailed format, command injection or shell injection are attack variants which causes arbitrary execution of commands supplied by a malicious web attacker. -L In Figure 5, we see a new value, specifically “wilhelm,” which turns out to be a username on the target system. into myshare on mypc (no password on share). Figure 2 – Lookup request to remote system. \m[blue]netbios name\m[] This includes user enumeration. This information is used only if the protocol level is high enough to support session-level passwords. -M|--message NetBIOS name In a world where security awareness is rapidly increasing and your grandmother even has a secure wireless access point, one might imagine that admins without command line experience and open, anonymous SMB shares are a thing of the past… think again! smbclient Note that all transfers in This command line parameter requires the remote server support the UNIX extensions. Only useful in an Active Directory environment. By default, the client writes messages to standard output - typically the user's tty. Since there might be some additional confusion in the general populace of the security community, I thought getting it published on The Ethical Hacker Network would be beneficial. All file names can be given as DOS path names (with '\\' as the component separator) or as UNIX path names (with '/' as the component separator). This command depends on the server supporting the CIFS UNIX extensions and will fail if the server does not. I also want to point out that there is a lot of functionality and restrictions / circumstances that would impact a pentester using these tools, and it is imperative for students to understand each flag / option / limitations of each tool or module they use. The client will request that the server attempt to delete all files matching Create a new directory on the server (user access privileges permitting) with the specified name. See also the mask command. Since this tutorial is for new students learning pentesting, I will begin our fun with SMB with enumeration and discuss some issues along the way. Execute commands remotely psexec. \m[blue]log level\m[] This can also be achieved by HTTPNotificationStrategy, but in this case, the system wanted an HTTP GET rather than the usual POST, and would not accept spaces in the URL. -L|--list So the first thing we want to do is find a system that has SMB running. This man page is correct for version 3.2 of the Samba suite. Create a tar file of the files listed in the file While that is certainly convenient for the employees, it is obviously quite devastating for the organization’s security posture. Show the currently active connection held for DFS purposes. The password required to access the specified service on the specified server. Creates a hardlink on the server using Windows CIFS semantics. The variable It should be specified in standard "a.b.c.d" notation. Anonymous logins are oftentimes extremely helpful when accessing remote systems during a pentest, but we should make sure to squeeze as much information out of the target as we can. parameter in the The terminal codes include CWsjis, CWeuc, CWjis7, CWjis8, CWjunet, CWhex, CWcap. The options are :"lmhosts", "host", "wins" and "bcast". Tries to unlock a POSIX fcntl lock on the given range. This is not a complete list, check the Samba source code for the complete list. If the domain specified is the same as the servers NetBIOS name, it causes the client to log on using the servers local SAM (as opposed to the Domain SAM). The prompt indicates that the client is ready and waiting to carry out a user command. During a pentest, I find these anonymous FTP systems quite frequently, and in some cases they serve up useful information. Blocksize. The client will request that the server return the "alternate" name (the 8.3 name) for a file or directory. Note that using the "-" option with tar x may not work - use the command line option instead. The target IP address along with the sharename is sent, along with who we want to log in as (again, administrator). file. mask This functionality is primarily intended as a development aid, and works best when using a LMHOSTS file. more map – The value of this property is a command to execute when the client connects to the share. See also the lowercase command. This command depends on the server supporting the CIFS UNIX extensions and will fail if the server does not. Fetch a remote file and view it with the contents of your PAGER environment variable. This is enforced by the Samba server. Since we currently don’t know any usernames on the system, using “administrator” works in a pinch. Then play with them to fully understand the subtle differences and consequences of each. getfacl Using either the command “ls” or “dir” we are presented with the current working directory and files / folders present within the share. * This is unfortunate, because if the path is specified incorrectly, and the cd fails, -P Used for internal Samba testing purposes. Negotiates SMB encryption using GSSAPI. Sets the SMB username or username and password. See the rmdir command. Hi. put [remote file name] compatible backups of all the files on an SMB/CIFS share. Unfortunately, this did not help the student, because their hands-on experience on Windows file sharing was all done using GUI. The default is 20. smbclient //mypc/myshare "" -N -TcF backup.tar tarlist. Because I need to execute in batch this copy, I have to use -c 'mput foo-*', how can I avoid the request of 'y' that I receive from the prompt of smbclient? from the current working directory on the server. servicename -O|--socket-options socket options Change to initial directory before starting. smb.conf(5) is a client that can 'talk' to an SMB/CIFS server. The format of the file is. -c|--comand command string level It could be possible that “wilhelm” had a password that we could attempt to brute force, which smb_client would be capable of performing as well. cancel jobid0 [jobid1] ... [jobidN] Note that the server will not create a link to any path that lies outside the currently connected share. 0 means ignore the archive bit, 1 means only operate on files with this bit set, 2 means only operate on files with this bit set and reset it after operation, 3 means operate on all files and reset it after operation. Does a directory listing and then prints out the current disk useage and free space on a share. If not supplied, it will be determined automatically by the client as described above. The information in this file includes server-specific information such as what printcap file to use, as well as descriptions of all the services that the server is to provide. Toggles the setting of the flag in SMB packets that tells the server to treat filenames as case sensitive. for example). ps If shell command is specified, the ! Typically during penetration tests, scanners are used to detect vulnerabilities. In fact, sharing a single file makes it easier to maintain revisions than copying a file back and forth between an FTP server. When toggled OFF, all specified files will be transferred without prompting. command string is a semicolon-separated list of commands to be executed instead of prompting from stdin. Set to OFF by default (tells file server to treat filenames as case insensitive). in the current working directory on the server will be retrieved from the server and displayed. There is a lot that can be done against a system with shares within a pentest. google_ad_channel ="9030538898"; Let’s take a look at the output of that module against our target as seen in Figure 4. -p|--port port Otherwise, smbclient runs in interactive mode, prompting for commands such as this: smb:\> This command depends on the server supporting the CIFS UNIX extensions and will fail if the server does not. -N The higher this value, the more detail will be logged to the log files about the activities of the server. allinfo file Used for internal Samba testing purposes. where That’s really about it – there are some quirks / formatting that need attention, but playing with smbclient is the best way to learn those (more homework). how to interpret filenames coming from the remote server. To list shares that are available from the configured Samba server, execute the following command: $ smbclient -L yourhostname. mask for “Bad As You Want To Be – Adversary Emulation Basics” w/ Jake Williams from May 28. google_color_text="000000"; If not given, the command will use suitable defaults. The name required is a NetBIOS server name, which may or may not be the same as the IP hostname of the machine running the server. mkdir There are no upcoming events at this time. This command depends on the server supporting the CIFS UNIX extensions and will fail if the server does not. may contain the password of the person using the client. What I would like to do is also know of any additional users on this system. recurse If no directory name is specified, the name of the current working directory on the local machine will be reported. smb.conf to prompt for a password and type it in directly. name resolve order I install new Ubuntu 18.04 to and integred Nextcloud 16.0.5. Smbclient. link target linkname smbclient file the name resolution methods will be attempted in this order. Used for internal Samba testing purposes. Parameters shown in square brackets (e.g., "[parameter]") are optional. While that is certainly convenient for the employees, it is obviously quite devastating for the organization’s security posture. Only files that match the mask specified using the mask command will be retrieved. If no password is supplied on the command line (either by using this parameter or adding a password to the for a description of how to handle incoming WinPopup messages in Samba. altname file from the machine running the client to the server. Used for internal Samba testing purposes. The original Samba software and related utilities were created by Andrew Tridgell. Change to initial directory before starting. The client should All commands are case-insensitive. In Figure 1, we see the results of an Nmap scan against a target within the Dojo’s lab. altname file This option is used by the programs in the Samba suite to determine what naming services and in what order to resolve host names to IP addresses. In full mode, tar will back up everything regardless of the archive bit setting (this is the default mode). Used for internal Samba testing purposes. Show the current connections held for DFS purposes. for more details. This may be addressed in future versions of the CIFS UNIX extensions. dir When tar command executes, it hit the checkpoint and execute the given command. The following are thus suggestions only. At level 0, only critical errors and serious warnings will be logged. smbclient may be used to create Now, if we compare FTP with system shares, we find that employees are quicker to allow anonymous access to their own files – all it takes is someone wanting access to some document another employee has on their system. //smbserver/printer. smb.conf All that said, those that have taken my class have heard the following mantra of mine numerous times, so I repeat it here: “Always be cynical – never trust your tools – always use more than one tool for each task…” and that saying works here as well. NetBIOS scopes are -U or using the name resolve order parameter in the Establishes a new vuid for this session by logging on again. Copy all files matching The conversion to DocBook for Samba 2.2 was done by Gerald Carter. Thank you for your comprehension. Actual results: Getting the Segmentation fault, no files are listed. I hope that those that are not familiar with smb take this lesson and delve deeper into the subject. Terminate the connection with the server and exit from the program. //server/service However, a command line setting will take precedence over settings in If no command is specified, a list of available commands will be displayed. get [local file name] This option allows you to override the NetBIOS name that Samba uses for itself. Setting this parameter will let A list of the files matching Once you are logged in, type help for a list of commands. SJIS Causes tar file to be written out in Simply typing "help" should show us all the commands we can use to 'put' and 'get' files. message command So your task is to study each and every option of the tools we tried in this tutorial. June – Video & Deck Available Now! Print the specified file from the local machine through a printable service on the server. One useful trick is to pipe the message through is specified, the current working directory on the local machine will be changed to the directory specified. from the current working directory on the server. SMBCLIENT(1) User Commands SMBCLIENT(1) NAME smbclient - ftp-like client to access SMB/CIFS resources on servers SYNOPSIS smbclient [-b ] [-d debuglevel] [-e] [-L ] [-U username] [-I destinationIP] [-M ] [-m maxprotocol] [-A authfile] [-N] [-C] [-g] [-i scope] [-O ] [-p port] [-R ] [-s ] [-t ] [-k] [-P] [-c ] smbclient … Without an argument prints out the current vuid being used. NOT I would simply map the drives at the command line as a system / network administrator. A third option is to use a credentials file which contains the plaintext of the username and password. The client will request that the server return all known information about a file or directory (including streams). Changes tar's behavior with regard to archive bits. LOGNAME -V|--version is the NetBIOS name of the SMB/CIFS server offering the desired service and this will return a list of 'service' names - that is, names of drives or printers that it can share with you. In Figure 3, we attempt again to connect anonymously, again using smbclient. If you have problems, set the debug level to 3 and peruse the log files. The prompt indicates that the client is ready and waiting to carry out a user command. Probably only of any use with the tar -T option. queue -s|--configfile option is not specified, the client will prompt for a password, even if the desired service does not require one. Also, when a tar archive is created, for “TryHackMe – Behind the Curtain” w/ Ben Spring and Ashu Savani from Aug 27. It allows Linux to work with the Windows operating system, as both a server and a client. option (suppress password prompt) is assumed. Does an SMBecho request to ping the server. Print a summary of command line options. Because of this, I decided to put together a quick tutorial for my students. instead of echo This is identical to setting the When toggled ON, the user will be prompted to confirm the transfer of each file during these commands. stat file google_ad_format = "336x280_as"; Used for internal Samba testing purposes. Deletes a remote file using the CIFS UNIX extensions. They cause names to be resolved as follows: The default order is lmhosts, host, wins, bcast and without this parameter or any entry in the So let’s take a look at SMB shares and how we can take advantage of them. be setuid or setgid! symlink target linkname //-->, smbclient [-b ] [-d debuglevel] [-e] [-L ] [-U username] [-I destinationIP] [-M ] [-m maxprotocol] [-A authfile] [-N] [-g] [-i scope] [-O ] [-p port] [-R ] [-s ] [-k] [-P] [-c ]. Toggle lowercasing of filenames for the get and mget commands. parameter in the -E|--stderr If %password is not specified, the user will be prompted. Aug – Video & Deck Available Now! From here we can navigate around using similar commands as those found in FTP applications. Make certain that the permissions on the file restrict access from unwanted users. users/docs. Remove the specified directory (user access privileges permitting) from the server. For example, all of the Metasploit tools I used in this example can generate a significant amount of noise. google_ad_height = 280; Changes the currently used vuid in the protocol to the given arbitrary number. This information is used only if the protocol level is high enough to support session-level passwords. In incremental mode, tar will only back up files with the archive bit set. in the current working directory on the local machine to the current working directory on the server. Note that It seems pertinent during this time of year, as I finish off the last batch of left over Christmas... You made it to part 4! Note there is currently no way to remotely look up the UNIX uid and gid values for a given name. ? Parameters shown in angle brackets (e.g., "") are required. It offers an interface similar to that of the ftp program (see Once the client is running, the user is presented with a prompt : The backslash ("\\") indicates the current working directory on the server, and will change if the current working directory is changed. If specified, name the local copy smb.conf However, if systems in a network are configured with anonymous shares, what we covered is pretty much all you need to know. %h – Server host name. This section/article is being written and is therefore not complete. If no directory name is specified, the current working directory on the server will be reported. In reset mode, tar will reset the archive bit on all files it backs up (implies read/write share). This flaw makes it possible to read any file from the victim system (any file that the user running links has read access), or to upload any file to the victim system Toggle prompting for filenames during operation of the mget and mput commands. So your task is to study each and every option of the tools we tried in this tutorial. Thoughts, suggestions, issues? command will execute a shell locally and run the specified shell command. options useful, as they allow you to control the FROM and TO parts of the message. command. But using the SMB, we can execute commands remotely on the server. Sending SMS via an external command. This includes the size, blocks used on disk, file type, permissions, inode number, number of links and finally the three timestamps (access, modify and change). Only currently affects Samba 3.0.5 and above file servers with the case sensitive parameter set to auto in the smb.conf. mask will be appended (e.g. Expected results: 1. (If no password is required, simply press ENTER to provide a null password.). Base directory name for log/debug files. 2. manual page for the list of valid options. There is a lot that can be done against a system with shares within a pentest. mask If the -U switch is not used, the username of the current user is passed to the Samba server. Note that all commands operating on the server are actually performed by issuing a request to the server. A tool often cited in tutorials regarding smb exploitation is Metasploit (which we will use next), and the smb_login module. posix This operation will fail if for any reason the specified directory is inaccessible. Registry database Regshell Figure 2 is the output from a request using smbclient to identify shares on the target system (the “-L” option asks for a lookup, and the “-U” option provides the username to the remote system). Incoming TCP connections allowed on port 445. This is often useful when copying (say) MSDOS files from a server, because lowercase filenames are the norm on UNIX systems. -T If tar [IXbgNa] case_sensitive smb.conf from the server to the machine running the client. If a password is specified on the command line and this option is also defined the password on the command line will be silently ingnored and no password will be used. Restore from tar file -U|--user=username[%password] md This command depends on the server supporting the CIFS UNIX extensions and will fail if the server does not. The See the mkdir command. INCOMPLETE SECTION OR ARTICLE. I also want to point out that there is a lot of functionality and restrictions / circumstances that would impact a pentester using these tools, and it is imperative for students to understand each flag / option / limitations of each tool or module they use. Be cautious about including passwords in scripts. for “CISO Underrepresented” w/ Mark Arnold and Steph Ihezukwu from June 30. to the machine FRED. I would simply map the drives at the command line as a system / network administrator. And yes… that also includes researching all of the command line options for interacting with SMB shares (Hint: type net in your Windows cmd). [command] are binary. Adding it to the original post. may contain the username of the person using the client. The message is also automatically truncated if the message is over 1600 bytes, as this is the limit of the protocol. google_color_url="000000"; Note: Some servers (including OS/2 and Windows for Workgroups) insist on an uppercase password. Deletes a remote directory using the CIFS UNIX extensions. Note that Parameters to commands may or may not be case sensitive, depending on the command. Note that all transfers in Once a connection is established you then type your message, pressing ^D (control-D) to end. volume Sept – Video & Deck Available Now! Just like the FTP application, there is a tool that makes it easy to connect remotely to file shares on other systems – smbclient. ".progname" The masks specified to the mget and mput commands act as filters for directories rather than files when recursion is toggled ON. blocksize*TBLOCK (usually 512 byte) blocks. Try to authenticate with kerberos. -c 'print -'. For example, if the mask specified in an mget command is "source*" and the mask specified with the mask command is "*.c" and recursion is toggled ON, the mget command will retrieve all files matching "*.c" in all directories below and including all directories matching "source*" in the current working directory. Then play with them to fully understand the subtle differences and consequences of each. The client requests the UNIX basic info level and prints out the same info that the Linux stat command would about the file. I had a question the other day from a student at the Hacking Dojo who was interested in accessing a Windows system remotely through SMB. Sets the archive level when operating on files. Send us an email, and we'll get back to you. Setting this value smaller (to 1200 bytes) has been observed to speed up file transfers to and from a Win9x server. smbclient //mypc/myshare "" -N -Tc backup.tar *. The option takes a space-separated string of different name resolution options. Nmap discovered NetBioS, the computer name (HACKINGDOJO-01), and the name of the workgroup in which the system is assigned (WORKGROUP). Since there might be some additional confusion in the general populace of the security community, I thought getting it published on The Ethical Hacker Network would be beneficial. smbclient's tar option places all files in the archive with relative names, not absolute names. iosize When toggled ON, these commands will process all directories in the source directory (i.e., the directory they are copying from ) and will recurse into any that match the mask specified to the command. To avoid unexpected results it would be wise to change the value of mask back to "*" after using the mget or mput commands. The client log files should be put in a directory readable and writeable only by the user. The location of the client program is a matter for individual system administrators. All commands are case-insensitive. That’s really about it – there are some quirks / formatting that need attention, but playing with smbclient is the best way to learn those (more homework). This option changes the transmit/send buffer size when getting or putting a file from/to the server. The log file name is specified at compile time, but may be overridden on the command line. The conversion to DocBook XML 4.2 for Samba 3.0 was done by Alexander Bokovoy. Pa… variable and if either exists, the string is uppercased. Using g (incremental) and N (newer) will affect tarmode settings. It has undergone several stages of development and stability. It is often necessary to use the -n option when connecting to some types of servers. Another example was to create an external command that takes some inputs, and then use that command to call a web service. However, there are other tools available to us in Metasploit that target smb. Copy the file called ftp(1)). Being an instructor as well as a full time pentester, I’m always looking for opportunities to assign more homework. However, if systems in a network are configured with anonymous shares, what we covered is pretty much all you need to know. A service name takes the form All that said, those that have taken my class have heard the following mantra of mine numerous times, so I repeat it here: “Always be cynical – never trust your tools – always use more than one tool for each task…” and that saying works here as well. Used for internal Samba testing purposes. parameter of the command line option above. -N is implied by -c. To install the basic Samba packages, execute the following command: # yum install samba If you require the smbclient on the server, then execute the following command:
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