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Padraignix's InfoSec Blog

Overview and walkthrough of the IBM 4th anniversary Quantum Challenge excercises and my solutions.

HTB Registry machine walkthrough. Working with insecure Docker credentials we manage to extract a SSH key and corresponding password crumbs for an initial user foothold. Following that access we find a sqlite file containing Bolt CMS admin credentials. Logging into the CMS we quickly modify the config file to allow a PHP shell of our choosing to access the host as www-data. Finally once we have www-data access we are able to abuse a restic sudo rule to expose the root flag.

HTB Sniper machine walkthrough. From an initial LFI/RFI foothold within the company website, to abusing malicious Windows help files, Sniper presents the story of a disgruntled developer and their middle finger to the Administrator/CEO on their way out. Sniper was a fun machine with a new angle on the RFI approach I had not used before and allowed me an opportunity to work with CHM files, something I previously also had not done.

HTB Forest machine walkthrough. Forest started with Windows enumeration using SMB and LDAP queries that lead to leveraging a lingering service account with PRE_AUTH disabled for user access. Once on the machine, we were able to abuse the existing Active Directory entitlements to create a malicious user entry with the rights to perform a DCSync using Mimikatz to acquire the Administrator's hash, finally using it to execute a pass-the-hash escalation to Administrator.

HTB Postman machine walkthrough. Postman was a quick, simple machine from HTB. We start off with a redis exploit for initial foothold, then pivot to user by using JTR to crack a backup SSH key before finally using an authenticated Webmin exploit to escalate ourselves to root.

Starting with a client side XSS exploit to get admin app credentials, then chaining it with a localhost code execution bypass we get a user priviledged shell. A suspicious app running locally as System then presented a ... delicate ... buffer overflow opporunity to pivot into System priviledges.