mimipenguin - A Tool To Dump The Login Password From The Current Linux User



Thursday, May 4, 2017


A tool to dump the login password from the current linux desktop user. Adapted from the idea behind the popular Windows tool mimikatz.

Details
Takes advantage of cleartext credentials in memory by dumping the process and extracting lines that have a high probability of containing cleartext passwords. Will attempt to calculate each word's probability by checking hashes in /etc/shadow, hashes in memory, and regex searches.

Requires
  • root permissions

Supported/Tested Systems
  • Kali 4.3.0 (rolling) x64 (gdm3)
  • Ubuntu Desktop 12.04 LTS x64 (Gnome Keyring 3.18.3-0ubuntu2)
  • Ubuntu Desktop 16.04 LTS x64 (Gnome Keyring 3.18.3-0ubuntu2)
  • XUbuntu Desktop 16.04 x64 (Gnome Keyring 3.18.3-0ubuntu2)
  • Archlinux x64 Gnome 3 (Gnome Keyring 3.20)
  • VSFTPd 3.0.3-8+b1 (Active FTP client connections)
  • Apache2 2.4.25-3 (Active/Old HTTP BASIC AUTH Sessions) [Gcore dependency]
  • openssh-server 1:7.3p1-1 (Active SSH connections - sudo usage)

Notes
  • Password moves in memory - still honing in on 100% effectiveness
  • Plan on expanding support and other credential locations
  • Working on expanding to non-desktop environments
  • Known bug - sometimes gcore hangs the script, this is a problem with gcore
  • Open to pull requests and community research
  • LDAP research (nscld winbind etc) planned for future

Development Roadmap
MimiPenguin is slowly being ported to multiple languages to support all possible post-exploit scenarios. The roadmap below was suggested by KINGSABRI to track the various versions and features. An "X" denotes full support while a "~" denotes a feature with known bugs.

Feature .sh .py
GDM password (Kali Desktop, Debian Desktop) ~ X
Gnome Keyring (Ubuntu Desktop, ArchLinux Desktop) X X
VSFTPd (Active FTP Connections) X X
Apache2 (Active HTTP Basic Auth Sessions) ~ ~
OpenSSH (Active SSH Sessions - Sudo Usage) ~ ~





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