{"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":"Obtenir le compte administrateur avec Ruby - S\u00e9curiser votre site","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"wJlVz6aOd3\"><a href=\"https:\/\/www.searchevolution.com\/security\/2021\/08\/03\/obtenir-le-compte-administrateur-avec-ruby\/\">Obtenir le compte administrateur avec Ruby<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.searchevolution.com\/security\/2021\/08\/03\/obtenir-le-compte-administrateur-avec-ruby\/embed\/#?secret=wJlVz6aOd3\" width=\"600\" height=\"338\" title=\"&laquo; Obtenir le compte administrateur avec Ruby &raquo; &#8212; S\u00e9curiser votre site\" data-secret=\"wJlVz6aOd3\" 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":"On se rend compte avec linPEAS que Ruby a les capabilities setuid On peut facilement obtenir le compte de l&#8217;administrateur. Si Ruby a \u00e9t\u00e9 prot\u00e9g\u00e9 avec apparmor pour ne pouvoir ex\u00e9cuter que quelques utilitaires et avoir acc\u00e8s qu&#8217;\u00e0 certains fichiers #include &lt;tunables\/global&gt; \/usr\/bin\/ruby2.5 { &nbsp;&nbsp;#include &lt;abstractions\/base&gt; &nbsp;&nbsp;capability setuid, &nbsp;&nbsp;deny owner \/etc\/nsswitch.conf r, &nbsp;&nbsp;deny \/root\/* rwx, &nbsp;&nbsp;deny \/etc\/shadow rwx, &nbsp;&nbsp;\/etc\/passwd r, &nbsp;&nbsp;\/bin\/cat mrix, &nbsp;&nbsp;\/bin\/cp mrix, &nbsp;&nbsp;\/bin\/ls mrix, &nbsp;&nbsp;\/usr\/bin\/whoami mrix, &nbsp;&nbsp;\/tmp\/.X*-lock rw, &nbsp;&nbsp;\/lib\/x86_64-linux-gnu\/ld-*.so mr, &nbsp;&nbsp;\/usr\/bin\/ruby2.5 mr, &nbsp;&nbsp;\/usr\/share\/rubygems-integration\/all\/specifications\/ r, &nbsp;&nbsp;\/usr\/share\/rubygems-integration\/all\/specifications\/did_you_mean-1.2.0.gemspec r, &nbsp;&nbsp;\/{usr\/,}lib{,32,64}\/** mr, } Nous avons acc\u00e8s aux commandes cat, cp et ls comme administrateur et au fichier \/tmp\/.X1-lock, \/tmp\/.X2-lock, etc&#8230; cp \/bin\/bash"}