EXPLOITATION D'UNE VULNERABILITE DE TRAVERSEE DE CHEMIN (File Reader)

ÉNONCÉ  DE L’ÉPREUVE:

File Reader
Recherche et lis le fichier
http://51.91.120.156/rumble/Point: 300
Type: Web

Définition de la vulnérabilité du traversée de chemin:

        C'est la vulnérabilité que donne la technique d'attaque par traversée de chemin d'accès (path traversal) qui permet à un pirate d'accéder aux fichiers, répertoires et commandes résidant potentiellement en dehors du répertoire racine des documents internet. Un agresseur peut manipuler une URL de telle sorte que le site internet exécutera ou révélera le contenu de fichiers arbitraires situés n'importe où sur le serveur internet. Tout dispositif qui expose une interface HTTP est potentiellement vulnérable à la traversée de chemin.

 Nous sommes confronter à ce site:

En le faisant passer dans un scanner de vulnérabilité, le rapport nous indique la présence d'une vulnérabilité de Traversée de chemin

Nous apprenons ainsi l'url vulnérable:   http://51.91.120.156/rumble/index.php?file=%2Fetc%2Fpasswd

Essayons de remplacer le fichier passwd par flag.txt pour voir.

Nous avons 

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

La présence de = à la fin nous indique qu'il pourait être un encodage base64. Essayons de décoder

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


Nous voyons qu'il s'agit d'une image (présence de "data:image/png;base64" au début). 

Essayons de la récupérer avec un outils en ligne de décodage d'image base64 

https://codebeautify.org/base64-to-image-converter

 

Ainsi nous avons notre CTF