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    Hackthebox: Driver Machine Walkthrough: Produced by

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    kasparov tovar
    This document provides a walkthrough of hacking the Driver machine on HackTheBox. It involves scanning the target, accessing a web page, uploading a file to dump hashes, cracking hashes to gain initial access as a user, then exploiting CVE-2021-1675 to create a new administrator user and fully compromise the system.

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    Download as PDF, TXT or read online from Scribd

    Hackthebox: Driver Machine Walkthrough: Produced by

    Uploaded by

    kasparov tovar
    56 views11 pages
    This document provides a walkthrough of hacking the Driver machine on HackTheBox. It involves scanning the target, accessing a web page, uploading a file to dump hashes, cracking hashes to gain initial access as a user, then exploiting CVE-2021-1675 to create a new administrator user and fully compromise the system.

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    Original Title

    Driver Machine

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    This document provides a walkthrough of hacking the Driver machine on HackTheBox. It involves scanning the target, accessing a web page, uploading a file to dump hashes, cracking hashes to gain initial access as a user, then exploiting CVE-2021-1675 to create a new administrator user and fully compromise the system.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    56 views11 pages

    Hackthebox: Driver Machine Walkthrough: Produced by

    Uploaded by

    kasparov tovar
    This document provides a walkthrough of hacking the Driver machine on HackTheBox. It involves scanning the target, accessing a web page, uploading a file to dump hashes, cracking hashes to gain initial access as a user, then exploiting CVE-2021-1675 to create a new administrator user and fully compromise the system.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 11

    HackTheBox: Driver Machine

    Walkthrough

    Produced by

    P a g e 1 | 11
    Table of Contents:
    Section 1: Scanning: ...............................................................................3
    Section 2: Accessing the Web page:.......................................................4
    Section 3: SCF file attacks: .....................................................................5
    What is SCF File? ................................................................................5
    Why have we used it? ..........................................................................5
    How to use it? ......................................................................................5
    The file we used to upload it on our target machine: ............................5
    Section 4: Dumping the hashes with responder: .....................................6
    Startup Responder: ..............................................................................6
    Upload the file to our target: .................................................................6
    Dumping the hashes: ...........................................................................6
    Section 5: Crack the hash: ......................................................................7
    Save the hash: .....................................................................................7
    Crack with Hashcat: .............................................................................7
    Section 6: Gain Access: ..........................................................................8
    Gain Access with the user credentials:.................................................8
    PrintNightmare (CVE-2021-1675): .......................................................9
    Download, Upload & Exploit (CVE-2021-1675) on the target machine: 9
    Gain Access with the newUser credentials:........................................10
    Section7: References:...........................................................................11

    P a g e 2 | 11
    Section 1: Scanning:
    o scanning the target
    o Sudo nmap -sV -A -O 10.10.11.106

    o We found that there are 3 open ports

    • We will add the IP in the domain hosts


    o Sudo nano /etc/hosts
    o Add 10.10.11.106

    P a g e 3 | 11
    Section 2: Accessing the Web page:
    • Open driver.htb in your browser

    o Username: admin & Passwd: admin

    o Now we will think about uploading a file in the Firmware


    update page to dump the hashes saved on this machine.
    P a g e 4 | 11
    Section 3: SCF file attacks:
    What is SCF File?
    o SCF (Shell Command Files) can be used to perform a limited set
    of operations such as showing the Windows desktop or opening a
    Windows explorer.
    Why have we used it?
    o SCF file can be used to access a specific UNC path which allows
    the penetration tester to build an attack.
    How to use it?
    o The code below can be placed inside a text file which then needs
    to be planted into a network share.

    o Saving the file as SCF file will make the file to be executed when
    the user will browse the file.
    o Adding the @ symbol in front of the filename will place the
    pentestlab.scf on the top of the share drive.
    o Replace your target IP with the X.X.X.X.
    The file we used to upload it on our target machine:

    P a g e 5 | 11
    Section 4: Dumping the hashes with responder:
    Startup Responder:
    o Sudo responder -I tun0

    Upload the file to our target:

    Dumping the hashes:

    P a g e 6 | 11
    Section 5: Crack the hash:
    Save the hash:
    o Save the NTLMv2 hash into a txt file.
    Crack with Hashcat:
    o we try to crack the NTLMv2 captured hash via Hashcat

    o Now we have a username: tony & Passwd: liltony

    P a g e 7 | 11
    Section 6: Gain Access:
    Gain Access with the user credentials:
    o we will use the Evil-winrm tool to gain access on the machine.

    o Searching for the user hash

    P a g e 8 | 11
    PrintNightmare (CVE-2021-1675):
    o This machine is talking about drivers for printer. So, we will think
    about printer vulnerabilities.
    o We will look for CVE 2021-1675.
    o CVE 2021-1675: A vulnerability that allows an attacker with low
    access privileges to use a malicious DLL file to escalate privilege.
    Threat actors can only take advantage of the vulnerability if they
    have direct access to the vulnerable system, so Microsoft
    categorized it as low risk.
    o We will use this CVE to create a user with the administrator
    privilege.
    o Github link: https://github.com/calebstewart/CVE-2021-1675

    Download, Upload & Exploit (CVE-2021-1675) on the target


    machine:
    o Download the file from the Github link.

    o We will use evil-winrm again with tony user to upload the CVE and
    exploit it.
    o We will use python to create a http server in the folder which
    contain the file.

    o From the Evil-winrm terminal we will download the CVE file and
    create a new user with new passwd:
    ✓ Username: newUser
    ✓ Passwd: SuperSecure

    o ‘http://your-ip:8080/CVE-2021-1675.ps1’

    P a g e 9 | 11
    Gain Access with the newUser credentials:
    o Login with the newUser from Evil-Winrm

    o search for the root hash

    o Cat the root.txt file

    Pwned

    P a g e 10 | 11
    Section7: References:
    o https://pentestlab.blog/2017/12/13/smb-share-scf-file-
    attacks/
    o https://www.ired.team/offensive-security/initial-
    access/t1187-forced-authentication
    o https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-
    2021-1675
    o https://www.blumira.com/cve-2021-1675/

    P a g e 11 | 11

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