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MimiPenguin 2.0

A tool to dump the login password from the current linux desktop user. Adapted from the idea behind the popular Windows tool mimikatz. This was assigned CVE-2018-20781 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20781). Fun fact it's still not fixed after GNOME Keyring 3.27.2 and still works as of 3.28.0.2-1ubuntu1.18.04.1.

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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. 2.0 introduces a clean C port that aims to increase the speed of execution and portability

Known Issues

  • The 32bit variant of mimipenguin (C build) may fail in a 64bit userspace as it currently does not adequatley handle searching a 64bit address space

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 14.04.1 LTS x64 (Gnome Keyring 3.10.1-1ubuntu4.3, LightDM 1.10.6-0ubuntu1)
  • Ubuntu Desktop 16.04 LTS x64 (Gnome Keyring 3.18.3-0ubuntu2)
  • Ubuntu Desktop 16.04.4 LTS x64 (Gnome Keyring 3.18.3-0ubuntu2, LightDM 1.18.3-0ubuntu1.1)
  • Ubuntu 18
  • XUbuntu Desktop 16.04 x64 (Gnome Keyring 3.18.3-0ubuntu2)
  • Archlinux x64 Gnome 3 (Gnome Keyring 3.20)
  • OpenSUSE Leap 42.2 x64 (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)

Building

  • To Build the C variant release simply run make in the root directory of the project
  • To build a debug binary with debug prints run make debug
  • To build a static linked binaries run make static

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

  • Implement needles in C port (speed up)
  • Add optional arg to target specific users only (speed up)

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
LightDM (Ubuntu Desktop) X X
VSFTPd (Active FTP Connections) X X
Apache2 (Active HTTP Basic Auth Sessions) ~ ~
OpenSSH (Active SSH Sessions - Sudo Usage) ~ ~

Contact

Licence

CC BY 4.0 licence - https://creativecommons.org/licenses/by/4.0/

Special Thanks

  • the-useless-one for remove Gcore as a dependency, cleaning up tabs, adding output option, and a full python3 port
  • gentilkiwi for Mimikatz, the inspiration and the twitter shoutout
  • pugilist for cleaning up PID extraction and testing
  • ianmiell for cleaning up some of my messy code
  • w0rm for identifying printf error when special chars are involved
  • benichmt1 for identifying multiple authenticate users issue
  • ChaitanyaHaritash for identifying special char edge case issues
  • ImAWizardLizard for cleaning up the pattern matches with a for loop
  • coreb1t for python3 checks, arch support, other fixes
  • n1nj4sec for a python2 port and support
  • KINGSABRI for the Roadmap proposal
  • bourgouinadrien for linking https://github.com/koalaman/shellcheck
  • bcoles for adding more needles and work on a metasploit module ruby port
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