Last Week in Security (LWiS) - 2021-12-07

Windows LPE 0day (@KLINIX5), Windows 10 URI handler "RCE" (@positive_sec), detect anomalous TLS certs with ML (@NCCGroupInfosec), USB-over-ethernet vuln (@kasifdekel), bitlocker key leak (@theluemmel), Linux TIPC LPE (@bl4sty), Tartarus' Gate (@trickster012), abusing SecLogon (@splinter_code), and more!

Last Week in Security is a summary of the interesting cybersecurity news, techniques, tools and exploits from the previous week. This post covers 2021-11-22 to 2021-12-07.



Tools and Exploits

  • InstallerFileTakeOver is a Windows LPE 0day for all supported Windows version. RIP.
  • cracken is a fast password wordlist generator, Smartlist creation and password hybrid-mask analysis tool written in pure safe Rust.
  • Exploiting CVE-2021-43267. This is a walkthrough and full exploit for Linux TIPC vulnerabilitiy that affects kernels between 5.10-rc1 and 5.15.
  • EDRSandblast is a tool written in C that weaponize a vulnerable signed driver to bypass EDR detections (Kernel callbacks and ETW TI provider) and LSASS protections. Multiple userland unhooking techniques are also implemented to evade userland monitoring.
  • SSHClient is a small SSH client written in C#. May be useful for pivoting from Windows to Linux.
  • EntitlementCheck is a Python3 script for macOS to recursively check /Applications and also check /usr/local/bin, /usr/bin, and /usr/sbin for binaries with problematic/interesting entitlements. Also checks for hardened runtime enablement.

New to Me

This section is for news, techniques, and tools that weren't released last week but are new to me. Perhaps you missed them too!

  • DetectionLabELK is a fork of DetectionLab with ELK stack instead of Splunk.
  • GoMapEnum is a user enumeration (Linkedin) and password bruteforcer for Azure, ADFS, OWA, O365, and Teams.
  • redherd-framework is a collaborative and serverless framework for orchestrating a geographically distributed group of assets capable of simulating complex offensive cyberspace operations.
  • ThePhish is an automated phishing email analysis tool based on TheHive, Cortex and MISP. It is a web application written in Python 3 and based on Flask that automates the entire analysis process starting from the extraction of the observables from the header and the body of an email to the elaboration of a verdict which is final in most cases.
  • BOF2shellcode is a POC tool to convert CobaltStrike BOF files to raw shellcode.

Techniques, tools, and exploits linked in this post are not reviewed for quality or safety. Do your own research and testing. This post is cross-posted on SIXGEN's blog.