{"id":2992,"date":"2025-01-22T17:26:55","date_gmt":"2025-01-22T17:26:55","guid":{"rendered":"https:\/\/elusivedata.io\/?p=2992"},"modified":"2025-07-18T18:04:33","modified_gmt":"2025-07-18T18:04:33","slug":"pages-de-debordement","status":"publish","type":"post","link":"https:\/\/elusivedata.io\/fr\/overflow-pages\/","title":{"rendered":"Pages de d\u00e9bordement SQLite : Comment la criminalistique num\u00e9rique r\u00e9cup\u00e8re les donn\u00e9es cach\u00e9es"},"content":{"rendered":"
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Introduction : Le casse-t\u00eate des pages de d\u00e9bordement<\/h2>

Imaginez que vous achetiez une affiche trop grande pour les cadres dont vous disposez chez vous. Pour l'afficher correctement, vous devez le d\u00e9couper en sections afin qu'il tienne dans les cadres disponibles. Le m\u00eame principe s'applique aux bases de donn\u00e9es SQLite lorsqu'elles traitent des enregistrements volumineux : elles les d\u00e9coupent en parties et les stockent sur plusieurs pages. C'est l\u00e0 que pages de d\u00e9bordement<\/strong> viennent.<\/p>

Les pages de d\u00e9bordement stockent des donn\u00e9es qui ne tiennent pas dans une seule page de la base de donn\u00e9es SQLite (typiquement 4 096 octets<\/strong>). Ces pages sont li\u00e9s les uns aux autres<\/strong>Les donn\u00e9es de l'analyseur doivent \u00eatre r\u00e9cup\u00e9r\u00e9es dans leur int\u00e9gralit\u00e9, formant ainsi une cha\u00eene que l'analyste doit reconstituer. Si les analystes ne respectent pas la structure de d\u00e9bordement, ils risquent de retrouver des preuves incompl\u00e8tes ou corrompues<\/strong>.<\/p>

Dans cet article, nous verrons comment fonctionnent les pages de d\u00e9bordement, pourquoi elles sont importantes dans les enqu\u00eates judiciaires et comment extraire des donn\u00e9es fragment\u00e9es, \u00e9tape par \u00e9tape.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Que sont les pages de d\u00e9bordement dans SQLite ?<\/h2>

Les bases de donn\u00e9es SQLite allouent une taille de page fixe (par exemple, 4 096 octets<\/strong>). Toutefois, lorsqu'un enregistrement - tel qu'une image stock\u00e9e sous forme de BLOB (Binary Large Object)<\/strong>-d\u00e9passe cette taille, les donn\u00e9es exc\u00e9dentaires se d\u00e9versent dans des pages de d\u00e9bordement<\/strong>.<\/p>

Principaux enseignements :<\/strong><\/h3>

\u2705 Pages de d\u00e9bordement \u00e9viter les enregistrements volumineux<\/strong> de monopoliser une seule page.
\u2705 Ils sont en cha\u00eene<\/strong>\u00e0 partir de la page principale.
\u2705 Analystes m\u00e9dico-l\u00e9gaux<\/strong> doit reconstruire ces cha\u00eenes pour r\u00e9cup\u00e9rer des donn\u00e9es compl\u00e8tes.<\/p>

Il est essentiel de comprendre le fonctionnement des pages de d\u00e9bordement pour les enqu\u00eates judiciaires.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Vue d'ensemble : Fonctionnement des pages de d\u00e9bordement<\/h3>

Pour illustrer le concept de pages de d\u00e9bordement, examinons les exemples suivants :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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1. Repr\u00e9sentation d'images fragment\u00e9es<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Illustration du stockage de donn\u00e9es fragment\u00e9es dans SQLite : Une grande image est divis\u00e9e en plusieurs images, repr\u00e9sentant la fa\u00e7on dont les pages de d\u00e9bordement g\u00e8rent les grands BLOB.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Cette visualisation repr\u00e9sente la mani\u00e8re dont les grands BLOB, tels que les images, sont stock\u00e9s dans SQLite. L'image est divis\u00e9e en plusieurs sections, tout comme une page de d\u00e9bordement stocke des donn\u00e9es fragment\u00e9es.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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2. Donn\u00e9es stock\u00e9es sur une seule page<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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L'image d'un avion \u00e0 r\u00e9action F-16 est enti\u00e8rement stock\u00e9e dans une seule page SQLite, ce qui constitue un cas id\u00e9al o\u00f9 les pages de d\u00e9bordement ne sont pas n\u00e9cessaires.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Ici, une image tient enti\u00e8rement dans une page de la base de donn\u00e9es, ce qui \u00e9limine le besoin de pages de d\u00e9bordement.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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3. Donn\u00e9es r\u00e9parties sur plusieurs pages<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Repr\u00e9sentation hexagonale d'une image stock\u00e9e de mani\u00e8re non contigu\u00eb sur les pages 7, 3 et 5 de SQLite, n\u00e9cessitant une reconstruction m\u00e9dico-l\u00e9gale.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Cet exemple illustre la fa\u00e7on dont les donn\u00e9es sont stock\u00e9es de mani\u00e8re non contigu\u00eb, ce qui n\u00e9cessite une analyse m\u00e9dico-l\u00e9gale pour les reconstituer correctement.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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4. Reconstruction des donn\u00e9es \u00e0 partir des pages de d\u00e9bordement<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Image reconstruite avec succ\u00e8s \u00e0 partir de pages SQLite fragment\u00e9es, illustrant le processus judiciaire de r\u00e9cup\u00e9ration des pages de d\u00e9bordement.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Le suivi des pointeurs de page de d\u00e9bordement permet aux analystes judiciaires de r\u00e9assembler les donn\u00e9es fragment\u00e9es.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Importance m\u00e9dico-l\u00e9gale des pages de d\u00e9bordement<\/h3>

Nombreux les applications de messagerie, les applications mobiles et les bases de donn\u00e9es<\/strong> stocker les images du profil de l'utilisateur, les journaux de discussion et les pi\u00e8ces jointes dans SQLite. Lorsque les images et les documents s'\u00e9tendent sur plusieurs pages, les enqu\u00eateurs doivent comprendre les structures de d\u00e9bordement pour extraire correctement les donn\u00e9es.<\/p>

D\u00e9fis m\u00e9dico-l\u00e9gaux :<\/h3>
  • Donn\u00e9es fragment\u00e9es :<\/strong> Les BLOB (tels que les images) sont souvent r\u00e9partis sur plusieurs pages.<\/li>
  • R\u00e9cup\u00e9ration bas\u00e9e sur les pointeurs :<\/strong> Les analystes doivent suivre les pointeurs de page de d\u00e9bordement de SQLite pour reconstruire l'image ou le fichier complet.<\/li>
  • Questions relatives \u00e0 la sculpture :<\/strong> La simple recherche d'un en-t\u00eate (FFD8FF) et d'un pied de page (FFD9) JPEG peut \u00e9chouer parce qu'ils peuvent exister sur des pages distinctes.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Exemple concret : Extraction d'une image de profil \u00e0 partir de pages de d\u00e9bordement<\/h3>

    Voyons maintenant comment r\u00e9cup\u00e9rer, \u00e9tape par \u00e9tape, une image stock\u00e9e dans une base de donn\u00e9es SQLite.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Localiser le BLOB dans la base de donn\u00e9es<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    DB Browser for SQLite montre une table de contacts avec des photos de profil stock\u00e9es sous forme de BLOB, une \u00e9tape essentielle dans l'extraction m\u00e9dico-l\u00e9gale.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Utilisation DB Browser pour SQLite<\/strong>Les analystes de la police scientifique identifient l'enregistrement contenant la photo de profil dans la base de donn\u00e9es de l'OMPI. contacts<\/code> table.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Identifier la longueur du BLOB en hexad\u00e9cimales<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    La valeur 0xB135 correspond \u00e0 une longueur de cellule de 6 325 octets (sans compter la valeur elle-m\u00eame ou l'ID de la ligne).<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Utilisation HxD<\/strong>En utilisant un \u00e9diteur hexagonal, ils localisent l'en-t\u00eate de l'enregistrement, qui contient un VARINT<\/strong> qui d\u00e9termine la longueur du BLOB.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Confirmer la taille de l'image<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    VARINT surlign\u00e9 en HxD montrant la taille totale de l'image (6 325 octets), confirmant qu'elle d\u00e9passe la taille standard d'une page SQLite.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Le deuxi\u00e8me VARINT de l'en-t\u00eate de l'enregistrement sp\u00e9cifie la taille de l'image. Dans ce cas, la taille totale est de 6 325 octets<\/strong>, d\u00e9passant la limite de pages.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Suivre le pointeur de d\u00e9bordement<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Pointeur de d\u00e9bordement SQLite au bas de la page, dirigeant la suite des donn\u00e9es vers la page 4 pour une r\u00e9cup\u00e9ration ult\u00e9rieure.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Au bas de la page principale, un pointeur de quatre octets<\/strong> conduit \u00e0 page 4<\/strong>qui contient la partie suivante de l'image.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Examiner la page de d\u00e9bordement<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Vue hexagonale d'une image fragment\u00e9e enti\u00e8rement mise en \u00e9vidence, pr\u00eate pour l'extraction manuelle et la reconstruction m\u00e9dico-l\u00e9gale.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Les quatre premiers octets de la page 4 indiquent si une autre page de d\u00e9bordement suit. Comme la valeur est 0x00000000<\/code>, il s'agit de la derni\u00e8re page de d\u00e9bordement<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Extraire et reconstruire l'image<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Vue hexagonale d'une image fragment\u00e9e enti\u00e8rement mise en \u00e9vidence, pr\u00eate pour l'extraction manuelle et la reconstruction m\u00e9dico-l\u00e9gale.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Les analystes judiciaires extraient les 6 292 octets<\/strong> de l'image des deux pages et la reconstruire manuellement.<\/p>

    \ud83d\udcccLes pointeurs de quatre octets ne font PAS partie des donn\u00e9es \u00e0 inclure dans l'image sculpt\u00e9e.<\/em><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    V\u00e9rifier l'image r\u00e9cup\u00e9r\u00e9e<\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Image extraiteL'image de profil r\u00e9cup\u00e9r\u00e9e \u00e0 partir des pages de d\u00e9bordement SQLite a \u00e9t\u00e9 grav\u00e9e et affich\u00e9e dans la visionneuse de photos de Windows.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    L'image extraite est maintenant enti\u00e8rement restaur\u00e9e et visible.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

    \n\t\t\t\t\t
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    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t

    Derni\u00e8res r\u00e9flexions : L'importance de l'analyse des pages de d\u00e9bordement<\/h3>

    Dans les enqu\u00eates judiciaires, le fait de n\u00e9gliger les pages de d\u00e9bordement peut conduire \u00e0 perte de preuves critiques<\/strong>. La compr\u00e9hension du m\u00e9canisme de stockage de SQLite est cruciale pour l'extraction et la reconstitution pr\u00e9cises des donn\u00e9es<\/strong>.<\/p>

    Principales informations m\u00e9dico-l\u00e9gales :<\/h3>

    \u2714\ufe0f Toujours v\u00e9rifier les pages de d\u00e9bordement<\/strong>lors de l'analyse d'enregistrements volumineux.<\/p>

    \u2714\ufe0f Suivre les r\u00e8gles de SQLite pointeurs de d\u00e9bordement<\/strong>avec soin.<\/p>

    \u2714\ufe0f Simple techniques de sculpture \u00e0 la lime<\/strong> peut ne pas fonctionner en raison d'un stockage non contigu.<\/p>

    Qu'il s'agisse d'analyser les bases de donn\u00e9es de chat, les listes de contacts ou les journaux d'application<\/strong>Les professionnels de la criminalistique doivent \u00eatre comp\u00e9tents pour r\u00e9cup\u00e9rer les donn\u00e9es fragment\u00e9es.<\/p>

    \ud83d\udca1 Avez-vous rencontr\u00e9 des donn\u00e9es fragment\u00e9es lors d'analyses forensiques de SQLite ? Comment abordez-vous l'analyse des pages de d\u00e9bordement ? Faites-nous part de vos observations ci-dessous !<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

    Les pages de d\u00e9bordement SQLite stockent des donn\u00e9es fragment\u00e9es qui ne tiennent pas dans une seule page de base de donn\u00e9es, ce qui oblige les analystes \u00e0 les reconstruire pour r\u00e9cup\u00e9rer l'int\u00e9gralit\u00e9 des preuves.<\/p>","protected":false},"author":1,"featured_media":2993,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[21],"tags":[],"class_list":["post-2992","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobile-forensics"],"acf":[],"yoast_head":"\nSQLite Overflow Pages: Hidden Data Recovery in Forensics<\/title>\n<meta name=\"description\" content=\"Learn how SQLite overflow pages impact forensic analysis and what tools and methods are used to recover hidden or lost data.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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