{"id":4638,"date":"2017-08-17T18:31:19","date_gmt":"2017-08-17T10:31:19","guid":{"rendered":"https:\/\/www.darknet.org.uk\/?p=4638"},"modified":"2017-10-03T19:26:47","modified_gmt":"2017-10-03T11:26:47","slug":"need-know-server-side-request-forgery-ssrf","status":"publish","type":"post","link":"https:\/\/www.darknet.org.uk\/2017\/08\/need-know-server-side-request-forgery-ssrf\/","title":{"rendered":"What You Need To Know About Server Side Request Forgery (SSRF)"},"content":{"rendered":"<p>SSRF or Server Side Request Forgery is an attack vector that has been around for a long time, but do you actually know what it is?<\/p>\n<blockquote><p>Server Side Request Forgery (SSRF) refers to an attack where in an attacker is able to send a crafted request from a vulnerable web application. SSRF is usually used to target internal systems behind firewalls that are normally inaccessible to an attacker from the external network.<\/p><\/blockquote>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.darknet.org.uk\/wp-content\/uploads\/2017\/08\/What-You-Need-To-Know-About-SSRF-Server-Side-Request-Forgery-640x266.png\" alt=\"What You Need To Know About SSRF - Server Side Request Forgery\" width=\"640\" height=\"266\" class=\"aligncenter size-medium wp-image-4639\" srcset=\"https:\/\/www.darknet.org.uk\/wp-content\/uploads\/2017\/08\/What-You-Need-To-Know-About-SSRF-Server-Side-Request-Forgery-640x266.png 640w, https:\/\/www.darknet.org.uk\/wp-content\/uploads\/2017\/08\/What-You-Need-To-Know-About-SSRF-Server-Side-Request-Forgery.png 910w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/p>\n<blockquote><p>Typically Server Side Request Forgery (SSRF) occurs when a web application is making a request, where an attacker has full or partial control of the request that is being sent. A common example is when an attacker can control all or part of the URL to which the web application makes a request to some third-party service.<\/p><\/blockquote>\n<p>There are various things you can use SSRF for such as:<\/p>\n<ul>\n<li>Scanning other machines within the private network of the vulnerable server that aren&#8217;t externally accessible<\/li>\n<li>Performing Remote File Inclusion (RFI) attacks<\/li>\n<li>Bypassing firewalls and use the vulnerable server to carry out malicious attacks<\/li>\n<li>Retrieving server files (including <code>\/etc\/passwd<\/code> etc)<\/li>\n<\/ul>\n<p>This is example code in PHP that is vulnerable to SSRF:<\/p>\n<pre><?php\r\n\r\n\/**\r\n* Check if the 'url' GET variable is set\r\n* Example - http:\/\/localhost\/?url=http:\/\/testphp.vulnweb.com\/images\/logo.gif\r\n*\/\r\nif (isset($_GET['url'])){\r\n$url = $_GET['url'];\r\n\r\n\/**\r\n* Send a request vulnerable to SSRF since\r\n* no validation is being done on $url\r\n* before sending the request\r\n*\/\r\n$image = fopen($url, 'rb');\r\n\r\n\/**\r\n* Send the correct response headers\r\n*\/\r\nheader(\"Content-Type: image\/png\");\r\n\r\n\/**\r\n* Dump the contents of the image\r\n*\/\r\nfpassthru($image);\r\n}<\/pre>\n<p>You can read more from Acunetix here:<\/p>\n<p><a href=\"https:\/\/www.acunetix.com\/blog\/articles\/server-side-request-forgery-vulnerability\/\">What is Server Side Request Forgery (SSRF)?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>SSRF or Server Side Request Forgery is an attack vector that has been around for a long time, but do you actually know what it is? Server Side Request Forgery (SSRF) refers to an attack where in an attacker is able to send a crafted request from a vulnerable web application. SSRF is usually used [&hellip;]<\/p>\n","protected":false},"author":25,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"SSRF or Server Side Request Forgery is an attack vector that has been around for a long time, but do you actually know what it is?","_seopress_robots_index":"","_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[10],"tags":[100,10635,10634,376],"featured_image_src":null,"featured_image_src_square":null,"author_info":{"display_name":"Darknet","author_link":"https:\/\/www.darknet.org.uk\/author\/darknet\/"},"_links":{"self":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/posts\/4638"}],"collection":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/users\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/comments?post=4638"}],"version-history":[{"count":0,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/posts\/4638\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/media?parent=4638"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/categories?post=4638"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darknet.org.uk\/wp-json\/wp\/v2\/tags?post=4638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}