$allowed_pages = ['header', 'footer', 'navbar']; $page = $_GET['page']; if (in_array($page, $allowed_pages)) include('/includes/' . $page . '.shtml'); else die('Invalid request.');
When a user requests a standard .html page, the web server simply delivers the file to the browser. However, when an .shtml file is requested, the web server parses the document first. It looks for specific directives formatted like HTML comments: Use code with caution.
Restrict access to trusted local networks or use a VPN.
http://example.com/view.shtml?page=../../../../etc/passwd view shtml patched
Spawning reverse shells to gain persistent access to the infrastructure. Example of an Exploitation Scenario
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This was revolutionary in the mid-1990s for static sites. However, SSI’s power comes with a dangerous feature: the ability to execute system commands using <!--#exec cmd="..." --> . However, when an
Both vulnerabilities have been patched—a fact explicitly noted in the CNVD entry, which states: "The vulnerability was observed as successfully patched by the user who reported the sighting". This reaffirms the active lifecycle: discover, disclose, patch, and communicate.
: Select "Patch Compliance" or "Security Vulnerability" as your primary metric.
System administrators check if their web servers (such as Apache or Nginx) are safely handling SSI directives. A "patched" status means the server either: Disallows the dangerous #exec directive entirely. http://example
The problem? SSI directives can also execute system commands if the configuration is insecure.
If successfully parsed, the server would execute the id command and embed the output into the HTML response. This gives the attacker a direct shell gateway.
$page = param('page'); $page =~ s/\.\.//g; # Remove parent dirs $page =~ s/[^a-zA-Z0-9_\-\.]//g; # Alphanumeric only $page = "includes/$page.html"; # Prepend safe path print "<!--#include virtual=\"$page\" -->";