Sanitize asdf GET parameter in install.php to prevent reflected XSS

[zeropath-ai-dean]

Summary

An attacker can execute arbitrary JavaScript in a user's browser due to a reflected XSS vulnerability. The install.php script directly echoes the asdf GET parameter on lines 12-13, which causes any provided HTML or JavaScript code to execute in the victim's session when they visit a specially crafted URL; because this script is accessible without authentication, attackers can target administrators and other users during the installation process, potentially leading to session hijacking or further malicious actions.

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Vulnerability Details

• Vulnerability Class: Cross Site Scripting (XSS)
• Severity: 8.0
• Affected File: install.php
• Vulnerable Lines: 12-13

Code Snippets

diff --git a/install.php b/install.php
--- a/install.php
+++ b/install.php
@@ -9,7 +9,7 @@
 //----------------------------------------------------------- include
 define('PHPWG_ROOT_PATH','./');
 
-echo $_GET['asdf'];
+echo isset($_GET['asdf']) ? htmlspecialchars($_GET['asdf'], ENT_QUOTES, 'UTF-8') : '';
 
 // @set_magic_quotes_runtime(0); // Disable magic_quotes_runtime
 //

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.

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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_77d872af

# if vscode is installed run (or use your favorite editor / IDE):
code install.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_77d872af