NorthSec CTF 2020

Configure Kali Linux to use VPN on IPv6 with OpenVPN configuration file

apt install network-manager-openvpn-gnome
sudo nmcli connection import type openvpn file /path/to/<vpn name>.ovpn
sudo nmcli connection modify <vpn name> ipv4.never-default true ipv6.never-default true

Activate the VPN

  • Click on the upper right corner of the screen on the Network icon (ethernet or wifi) -> VPN Connections
  • Select the checkbox for the <vpn name>

Install system-wide certificate

mkdir /usr/share/ca-certificates/extra

# Move certificates ca.crt
mv ca.crt /usr/share/ca-certificates/extra/ca.crt

# Press space to select the certificate, then Enter
dpkg-reconfigure ca-certificates
update-ca-certificates

Submit a flag

Install & config

cd /usr/bin
wget https://dl.nsec/askgod/linux/askgod
chmod u+x askgod
# Submit the flag
askgod submit FLAG-742044716bbe0a9ebf74ea12814b3369

CTF

Poetry essaY

Failing Revenge

Last minute homework

Crossword

Flag 1

exiftool acrossword.pdf

ExifTool Version Number         : 11.98
File Name                       : acrossword.pdf
Directory                       : .
File Size                       : 129 kB
File Modification Date/Time     : 2020:05:17 15:53:32-04:00
File Access Date/Time           : 2020:05:17 15:53:50-04:00
File Inode Change Date/Time     : 2020:05:17 15:53:47-04:00
File Permissions                : rw-r--r--
File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.5
Linearized                      : Yes
Author                          : 
Create Date                     : 2020:05:16 19:33:10Z
Creator                         : LaTeX with hyperref
Keywords                        : acrossword, northsec, nsec
Modify Date                     : 2020:05:16 19:33:10Z
PTEX Fullbanner                 : This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019) kpathsea version 6.3.1
Producer                        : RkxBRy00NWI5Y2Q5OTNkODM1MWNhNTM4YjA4MGFkNGUxYmIwZA==
Subject                         : 
Title                           : Acrossword - Northsec 2020
Trapped                         : False
Page Mode                       : UseOutlines
Page Count                      : 1

# We find a base 64 string in Producer
Producer: RkxBRy00NWI5Y2Q5OTNkODM1MWNhNTM4YjA4MGFkNGUxYmIwZA==

echo "RkxBRy00NWI5Y2Q5OTNkODM1MWNhNTM4YjA4MGFkNGUxYmIwZA==" | base64 -d
FLAG-45b9cd993d8351ca538b080ad4e1bb0d

Flag 2

1 - ClifFordstoll
2- MollyMiLlions
3- SnowcrAsh
G
4- Forty-Two
5- JewsBury
6- DoCtorow
7- overtheRhine
8- HeNdrix
9-EXtro
10- LamarcK Logic
11- VoighT-Kampff
12-  nOr 
13- 1.75Gippers

askgod submit FLAG-BCRNXKTO7
Congratulations, you score your team 3 points!
Message: My grade is saved, thank you! No need to copy off Susan anymore.

Final Score

               TEAM               | POINTS |   LAST SUBMIT     
----------------------------------+--------+-------------------
  <CA> HubrETS Hackin''           |    155 | 2020/05/17 14:58  
  <CA> Les Gentils Pirates        |    133 | 2020/05/17 14:42  
  <CA> CLICKESTI                  |    129 | 2020/05/17 14:07  
  <US> Skiddies as a Service      |    125 | 2020/05/17 14:44  
  <CA> cold_root                  |    116 | 2020/05/17 14:38  
  <CA> Panique Au Village         |     94 | 2020/05/17 14:47  
  <CA> Shopify                    |     84 | 2020/05/17 14:47  
  <CA> segfaults                  |     77 | 2020/05/17 14:55  
  <DE> KernelSpaceInvaders & WoD  |     74 | 2020/05/17 14:40  
  <CA> BSoD                       |     70 | 2020/05/17 14:48  
  <CA> SharedSec                  |     68 | 2020/05/17 14:52  
  <CA> 0K10K                      |     67 | 2020/05/17 14:08  
  <CA> Gliderous Tigers           |     65 | 2020/05/17 14:55  
  <CA> Maple Bacon                |     62 | 2020/05/17 14:57  
  <CA> MafiaBoyToy                |     62 | 2020/05/17 14:50  
  <CA> X-Men                      |     59 | 2020/05/17 13:59  
  <CA> Bring Back The Minitel     |     55 | 2020/05/17 13:06  
  <CA> x90x90x90                  |     54 | 2020/05/17 13:51  
  <CA> dc604                      |     54 | 2020/05/17 14:02  
  <CA> DCI                        |     49 | 2020/05/17 14:59  
  <CA>  25anHawaienDoneurDorgane  |     46 | 2020/05/17 13:45  
  <CA> H4TT                       |     45 | 2020/05/17 14:15  
  <CA> Lan ETS                    |     44 | 2020/05/17 13:41  
  <CA> Razmok3t.exe               |     41 | 2020/05/17 14:51  
  <CA> DreamTeamVM                |     41 | 2020/05/17 15:00  
  <CA> DC902                      |     41 | 2020/05/17 00:48  
  <CA> Tsarserveur                |     40 | 2020/05/17 14:41  
  <CA> nete@m_2020                |     40 | 2020/05/17 13:53  
  <CA> PolyHx                     |     39 | 2020/05/17 11:30  
  <CA> omegazulsec                |     38 | 2020/05/17 11:54  
  <CH> duks                       |     37 | 2020/05/17 13:06  
  <CA> Ex-Ray Troupe              |     37 | 2020/05/17 14:45  
  <CA> German Pron Dungeon        |     36 | 2020/05/17 13:54  
  <CA> R4mp1v4                    |     34 | 2020/05/17 13:26  
  <NL> Simba                      |     34 | 2020/05/17 14:19  
  <CA> Susan from Accounting      |     34 | 2020/05/17 14:53  
  <CA> TobysSupermalware          |     33 | 2020/05/17 12:04  
  <KP> ngan                       |     31 | 2020/05/17 13:34  
  <FR> Th3 Cu5t0c1n3s             |     31 | 2020/05/17 10:44  
  <CA> CSICSTJEAN                 |     31 | 2020/05/17 14:30  
  <CA> BdeB                       |     31 | 2020/05/17 13:44  
  <CA> The_Nancys                 |     30 | 2020/05/17 14:01  
  <CA> MissingNo.                 |     30 | 2020/05/17 09:57  
  <CA> LesBluePassePusDansPorte   |     29 | 2020/05/17 13:59  
  <CA> WTSec                      |     28 | 2020/05/17 14:55  
  <CA> Unicorn As A Service       |     27 | 2020/05/17 09:49  
  <KP> 0xmatamate                 |     26 | 2020/05/17 14:19  
  <CA> chaox_crew                 |     25 | 2020/05/17 10:18  
  <CA> Kangur00t                  |     25 | 2020/05/17 13:48  
  <CA> pwnpatrol                  |     23 | 2020/05/17 00:27  
  <CA> HackerKnights              |     23 | 2020/05/17 14:58  
  <CA> Let Me In                  |     23 | 2020/05/17 11:48  
  <CA> Wrecking Crew              |     22 | 2020/05/17 01:30  
  <CA> Coveo                      |     22 | 2020/05/16 22:25  
  <CA> AGEEI                      |     22 | 2020/05/17 02:19  
  <CA> Licornes a Clavier         |     21 | 2020/05/17 14:59  
  <IM> 202020202020 TEAM 20       |     20 | 2020/05/17 14:17  
  <CA> Morgan and Friends         |     20 | 2020/05/16 22:35  
  <CA> Mercid'avoirvoyageaveclaS  |     19 | 2020/05/17 13:42  
  <CA> Null2Ten                   |     19 | 2020/05/16 23:35  
  <CA> The Fearsome Foursome      |     19 | 2020/05/17 14:22  
  <CA> ForbiddenTask              |     19 | 2020/05/17 13:42  
  <CA> EtherBray                  |     17 | 2020/05/17 14:04  
  <CA> CRTC                       |     16 | 2020/05/16 23:13  
  <CA> M07H3R5H1P                 |     16 | 2020/05/17 11:12  
  <CA> lowprivshighghopes         |     15 | 2020/05/17 14:53  
  <CA> Here4beer                  |     14 | 2020/05/17 01:04  
  <CA> Freelancer-6               |     13 | 2020/05/17 10:09  
  <CA> Sherbreach                 |     13 | 2020/05/17 11:39  
  <CA> ECHO                       |     13 | 2020/05/16 23:51  
  <CA> team18                     |     10 | 2020/05/17 13:39  
  <CA> NorthSec - admins          |      9 | 2020/05/17 13:53  
  <CA> sudoheirs                  |      8 | 2020/05/17 01:19  
  <CA> team-079                   |      6 | 2020/05/17 14:11  
  <US> TheKraken                  |      5 | 2020/05/17 09:57  
  <CA> HubrETS Hackin''           |      5 | 2020/05/15 22:42  
  <CA> Freelancer                 |      3 | 2020/05/15 22:24  
  <CA> Team24                     |      1 | 2020/05/16 08:52  
  <CA> team-015                   |      0 | 2020/05/16 22:00