Linux Archives - Page 4 of 20

5 Jul, 2025

Hack The Box: Cat Machine Walkthrough – Medium Diffculity

Medium Machine BurpSuite, Challenges, command injection, Cross Site Scripting, git-dumper, Gitea, gobuster, HackTheBox, hashcat, Linux, Penetration Testing, port forwarding, source code review, SQL, SQL Injection, sqlite3, ssh

Hack The Box Success: Cat Machine Write-Up Published!

I’ve just published my personal write-up for the Cat machine on Hack The Box. In this challenge, I gained the user flag by exploiting a Stored XSS vulnerability to capture the admin session cookie, followed by an SQL Injection to extract credentials and gain SSH access. For the root flag, I took advantage of a vulnerable image processing script owned by root, crafting a payload to gain a root shell and retrieve the flag. The full write-up dives into each step, the logic behind the attacks, and key takeaways.

#CyberSecurity #HackTheBox #PenetrationTesting #EthicalHacking #CTF #WriteUp #XSS #SQLi #PrivilegeEscalation #InfoSec #CTFWriteup …

Learn MoreHack The Box: Cat Machine Walkthrough – Medium Diffculity

28 Jun, 2025

Hack The Box: Haze Machine Walkthrough – Hard Difficulty

Hard Machine Active Directory, Bloodhound, bloodyAD, Certipy, Challenges, CVE-2024-36991, evil-winrm, HackTheBox, Linux, Local File Inclusion (LFI), NetExec, Penetration Testing, pywhisker, Splunk, splunksecrets, SweetPotato

New Write-Up Published: Haze [Medium | Windows | Active Directory] – Hack The Box

Just released a walkthrough for Haze, a medium-difficulty Windows machine on Hack The Box. Initial access was obtained by exploiting CVE-2024-36991, a local file inclusion vulnerability in Splunk, to extract LDAP credentials. This enabled a Shadow Credentials attack using PyWhisker and Certipy, allowing lateral movement to a high-privileged domain user. For privilege escalation, I utilized Splunk admin access to deploy a reverse shell via a crafted app package. Upon gaining shell access, I escalated privileges to NT SYSTEM by abusing SeImpersonatePrivilege with SweetPotato. This box offers great insight into chained Active Directory abuse and Splunk misconfigurations.

#HackTheBox #RedTeam #ActiveDirectory #Splunk #CVE202436991 #ShadowCredentials #PrivilegeEscalation #SweetPotato #CTF #InfoSec #WriteUp #CyberSecurity …

Learn MoreHack The Box: Haze Machine Walkthrough – Hard Difficulty

21 Jun, 2025

Hack The Box: Titanic Machine Walkthrough – Easy Difficulty

Easy Machine BurpSuite, Challenges, CVE-2024-41817, directory traversal, HackTheBox, ImageMagick, Linux, Penetration Testing, python3, ssh

Just wrapped up a detailed walkthrough of the Hack The Box Titanic machine — an easy-rated challenge packed with valuable learning opportunities!

The journey started with exploiting a directory traversal vulnerability to access sensitive Gitea configuration files and extract user credentials. From there, I gained SSH access as the developer user and retrieved the user flag.

Privilege escalation was achieved by exploiting a critical ImageMagick vulnerability (CVE-2024-41817) in a writable directory, allowing arbitrary code execution via a crafted shared library. I also discovered the developer user had unrestricted sudo privileges, providing a straightforward path to root.

#HackTheBox #CyberSecurity #Pentesting #CTF #PrivilegeEscalation #LinuxSecurity #ImageMagick #CVE202441817 #EthicalHacking #DirectoryTraversal

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Learn MoreHack The Box: Titanic Machine Walkthrough – Easy Difficulty

7 Jun, 2025

Hack The Box: Backfire Machine Walkthrough – Medium Difficulty

Medium Machine Challenges, CVE-2024-41570, HackTheBox, Havoc C2, iptables, iptables-save, jwt, Linux, Penetration Testing, port forwarding, python3, ssh

Successfully rooted another Hack The Box machine by chaining multiple vulnerabilities across custom C2 frameworks. For the user flag, we exploited an SSRF vulnerability (CVE-2024-41570) in the Havoc C2 framework to access internal services, which we then chained with an authenticated RCE to execute arbitrary commands and gain a reverse shell as the ilya user. To maintain stable access, SSH keys were added for persistence, allowing us to retrieve the user.txt flag. For the root flag, we targeted the Hardhat C2 service by forging a valid JWT with a Python script to create an admin user, which provided shell access as sergej. Upon privilege escalation analysis, we found that sergej had sudo access to the iptables-save binary. This was abused to overwrite the /etc/sudoers file and escalate to root, ultimately retrieving the root.txt flag. Another great learning experience on the path to mastering offensive security!

#HackTheBox #CyberSecurity #InfoSec #RedTeam #CTF #PrivilegeEscalation #RCE #SSRF #Linux #HTB #EthicalHacking #PenetrationTesting #HavocC2 #HardhatC2 #JWT #SudoExploit #OSCP #BugBounty …

Learn MoreHack The Box: Backfire Machine Walkthrough – Medium Difficulty

31 May, 2025

Hack The Box: Checker Machine Walkthrough – Hard Difficulty

Hard Machine BookStack, BurpSuite, Challenges, CVE-2023-1545, CVE-2023-6199, gobuster, HackTheBox, Linux, OTP, Penetration Testing, python3, ssh, Teampass

Successfully exploited CVE-2023-1545 in Teampass to extract user credentials and leveraged CVE-2023-6199 in BookStack to obtain an OTP, gaining user-level access on the Checker machine. Privilege escalation was achieved by exploiting a sudo script interacting with shared memory, setting the SUID bit on /bin/bash to capture the root flag. A great example of combining application vulnerabilities with creative privilege escalation techniques!

#Cybersecurity #EthicalHacking #HackTheBox #PenetrationTesting #InfoSec #VulnerabilityResearch #PrivilegeEscalation #CTF #SecurityResearch …

Learn MoreHack The Box: Checker Machine Walkthrough – Hard Difficulty

17 May, 2025

Hack The Box: Heal Machine Walkthrough – Medium Difficulty

Medium Machine BurpSuite, Challenges, consul, HackTheBox, hashcat, jwt, LimeSurvey, Linux, Path Traversal, Penetration Testing, port forwarding, rails, ruby, sqlite3, ssh

Writeup Summary: Heal (Hack The Box)

This box involved thorough enumeration that uncovered multiple subdomains, including a Ruby on Rails API. Initial access was gained by chaining a Local File Inclusion vulnerability with password cracking and exploiting a LimeSurvey plugin upload vulnerability. Privilege escalation was achieved by identifying and exploiting an exposed Consul service accessible through SSH port forwarding.

This challenge showcased key red teaming skills: web application exploitation, misconfiguration abuse, credential harvesting, and lateral movement.

#HackTheBox #CyberSecurity #RedTeam #PrivilegeEscalation #BugBounty #WebSecurity #Infosec #CTF #HTB #OffensiveSecurity #LinuxExploitation …

Learn MoreHack The Box: Heal Machine Walkthrough – Medium Difficulty

10 May, 2025

Hack The Box: Underpass Machine Walkthrough – Easy Difficulty

Easy Machine apache2, Challenges, Daloradius, gobuster, HackTheBox, hashcat, Linux, mosh-server, Penetration Testing, snmp

Successfully completed the “Underpass” machine on Hack The Box! For the user flag, I enumerated SNMP to discover a Daloradius instance, logged in with default credentials, cracked an MD5-hashed password for the svcMosh account, and used SSH to access the user flag in its home directory. To capture the root flag, I escalated privileges by exploiting sudo permissions on mosh-server, obtaining a session key and port to establish a root session and retrieve the flag from /root/root.txt.

#Cybersecurity #HackTheBox #CaptureTheFlag #PenetrationTesting #LinuxSecurity #PrivilegeEscalation #SNMP #Daloradius #EthicalHacking #InformationSecurity …

Learn MoreHack The Box: Underpass Machine Walkthrough – Easy Difficulty

3 May, 2025

HackTheBox – BigBang Machine Walkthrough (Hard Difficulty)

Hard Machine Android, BuddyForms, BurpSuite, Challenges, chisel, CVE-2023-26326, CVE-2024-2961, file upload, gobuster, grafana, grafana2hashcat, HackTheBox, hashcat, Linux, Local File Inclusion (LFI), MySQL, Penetration Testing, port forwarding, python3, Remote Code Execution (RCE) in WordPress, Server Misconfigurations, Wordpress

Chained exploitation through misconfigured web app and internal services. We started by exploiting a WordPress plugin vulnerability (CVE-2023-26326) to upload files, followed by a file read vulnerability (CVE-2024-2961) for remote code execution. From there, we cracked the database credentials, gained SSH access as the shawking user, and leveraged a vulnerable API endpoint to escalate to root. This highlights how overlooked configurations and service misconfigurations can lead to a full server compromise.

#CTF #PrivilegeEscalation #WebSecurity #CommandInjection #SSH #WordPress #LinuxPentesting #BugBounty #HackTheBox #RedTeam #CyberSecurity …

Learn MoreHackTheBox – BigBang Machine Walkthrough (Hard Difficulty)

12 Apr, 2025

Hack The Box: LinkVortex Machine Walkthrough Easy Difficulty

Easy Machine BurpSuite, Challenges, CVE-2023-40028, GhostCMS, GitDumper, HackTheBox, Linux, Local File Inclusion, Penetration Testing, ssh, SudoMisconfiguration

Successfully demonstrated advanced cybersecurity skills by exploiting a Ghost CMS vulnerability (CVE-2023-40028) to access sensitive credentials and secure the user flag. Identified and leveraged a sudo misconfiguration with the CHECK_CONTENT variable to escalate privileges and retrieve the root flag from /root/root.txt. Thrived in this hands-on challenge, sharpening penetration testing expertise! #HackTheBox #Cybersecurity #EthicalHacking #PenetrationTesting #CTF …

Learn MoreHack The Box: LinkVortex Machine Walkthrough Easy Difficulty

5 Apr, 2025

Hack The Box: Ghost Machine Walkthrough – Insane Difficulty

Insane Machine adfs abuse attack, ADFSDump, ADFSSpoof, Bloodhound, BloodHoundCE, BurpSuite, Challenges, command injection, docker, efspotatoo, evil-winrm, Gitea, HackTheBox, hashcat, JokerShell, kerberos, LFI, Linux, mimkatz, Penetration Testing, responder, rubeus.exe, SQL, ssh

The initial foothold was gained by exploiting command injection on intranet.ghost.htb:8008/api-dev/scan/, which provided a reverse shell inside a Docker container. From there, I enumerated the environment and discovered credentials that allowed SSH access as Florence Ramirez. By extracting and converting a Kerberos ticket, I authenticated as a legitimate user, escalating access within the system. With access to the Windows environment, I retrieved NTLM hashes for the adfs_gmsa account and leveraged evil-winrm for lateral movement. A reverse shell was established using JokerShell, and privileges were escalated by enabling xp_cmdshell through a debug interface. After uploading EfsPotato.cs and disabling antivirus, I used Mimikatz and Rubeus.exe to dump credentials, ultimately achieving SYSTEM access. This led to the extraction of domain admin credentials and the retrieval of the root flag. Another Insane box down! 💀💻

#HackTheBox #RedTeam #CyberSecurity #PenTesting #PrivilegeEscalation #EthicalHacking …

Learn MoreHack The Box: Ghost Machine Walkthrough – Insane Difficulty

Threatninja.net

Threatninja.net

Hack The Box: Cat Machine Walkthrough – Medium Diffculity

Hack The Box: Haze Machine Walkthrough – Hard Difficulty

Hack The Box: Titanic Machine Walkthrough – Easy Difficulty

Hack The Box: Backfire Machine Walkthrough – Medium Difficulty

Hack The Box: Checker Machine Walkthrough – Hard Difficulty

Hack The Box: Heal Machine Walkthrough – Medium Difficulty

Hack The Box: Underpass Machine Walkthrough – Easy Difficulty

HackTheBox – BigBang Machine Walkthrough (Hard Difficulty)

Hack The Box: LinkVortex Machine Walkthrough Easy Difficulty

Hack The Box: Ghost Machine Walkthrough – Insane Difficulty

Threatninja.net

Threatninja.net

Tag Archives: Linux