Sanitize 'asdf' GET parameter to prevent reflected XSS in index.php

[zeropath-ai]

Summary

A reflected Cross-Site Scripting (XSS) vulnerability exists in index.php due to unsanitized output, which allows an attacker to execute arbitrary JavaScript in a user's browser, potentially leading to session hijacking or defacement. Specifically, the application directly echoes the HTTP GET parameter 'asdf' on line 23 without proper encoding. This lack of sanitization allows injection of malicious HTML or JavaScript code.

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Vulnerability Details

• Vulnerability Class: Cross Site Scripting (XSS)
• Severity: 9.0
• Affected File: index.php
• Vulnerable Lines: 23-23

Code Snippets

diff --git a/index.php b/index.php
--- a/index.php
+++ b/index.php
@@ -19,9 +19,9 @@
 
 
 
-echo $_GET['asdf'];
-echo $_GET['asdf'];
-echo $_GET['asdf'];
+echo isset($_GET['asdf']) ? htmlspecialchars($_GET['asdf'], ENT_QUOTES, 'UTF-8') : '';
+echo isset($_GET['asdf']) ? htmlspecialchars($_GET['asdf'], ENT_QUOTES, 'UTF-8') : '';
+echo isset($_GET['asdf']) ? htmlspecialchars($_GET['asdf'], ENT_QUOTES, 'UTF-8') : '';
 
 // access authorization check
 if (isset($page['category']))

How to Modify the Patch

You can modify this patch by using one of the two methods outlined below. We recommend using the @zeropath-ai bot for updating the code. If you encounter any bugs or issues with the patch, please report them here.

Ask @zeropath-ai!

To request modifications, please post a comment beginning with @zeropath-ai and specify the changes required.

@zeropath-ai will then implement the requested adjustments and commit them to the specified branch in this pull request. Our bot is capable of managing changes across multiple files and various development-related requests.

Manually Modify the Files

# Checkout created branch:
git checkout zvuln_fix_26e4475c

# if vscode is installed run (or use your favorite editor / IDE):
code index.php

# Add, commit, and push changes:
git add -A
git commit -m "Update generated patch with x, y, and z changes."
git push zvuln_fix_26e4475c