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.

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 adequately 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

• Twitter: @huntergregal
• Website: huntergregal.com
• Github: huntergregal

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
• space-r7 and bcoles for work on the Metasploit MimiPenguin module port