SourceCodester Book Borrower System add-book.php cross site scripting

The XSS vulnerability in Book Borrower System allows an attacker to inject arbitrary JavaScript code into the application. This code can then be executed in the context of a user's browser when they visit a page containing the injected script. An attacker could leverage this to steal session cookies, redirect users to malicious websites, or deface the application's interface. The impact is amplified if the application is used by a large number of users or handles sensitive data, as the attacker could potentially compromise a significant number of accounts. This vulnerability is similar to other XSS flaws where user-supplied input is not properly sanitized before being displayed in a web page.

Organizations and individuals using the SourceCodester Book Borrower System, particularly those running version 1.0, are at risk. Shared hosting environments where multiple users share the same server instance are especially vulnerable, as an attacker could potentially compromise other users' accounts through this vulnerability.

• php: Examine the /add-book.php file for unsanitized input handling of Book Title and Book Author parameters. Search for instances where these parameters are directly outputted to the page without proper encoding.

// Example of vulnerable code
<?php
echo $_GET['book_title'];
?>

• generic web: Monitor access logs for requests to /add-book.php with unusual or suspicious characters in the Book Title or Book Author parameters. Look for patterns indicative of XSS payloads (e.g., <script>, javascript:, onerror=).

grep 'book_title=[^a-zA-Z0-9 ]+' access.log

• generic web: Check response headers for the presence of X-XSS-Protection or Content-Security-Policy headers. These headers can help mitigate XSS attacks, but are not a substitute for proper input validation and output encoding.

1. 2023-11-30Disclosure

   disclosure

1. 已保留2023-11-30
2. 发布日期2023-11-30
3. 修改日期2024-08-02
4. EPSS 更新日期2026-04-02

The primary mitigation for CVE-2023-6440 is to upgrade to version 1.0.1 of the Book Borrower System. If upgrading is not immediately feasible, consider implementing input validation and output encoding on the /add-book.php endpoint to sanitize user-supplied data. Web Application Firewalls (WAFs) can be configured to detect and block malicious requests containing XSS payloads. Regularly review and update the application's codebase to address potential security vulnerabilities. After upgrading, confirm the fix by attempting to add a book with a specially crafted title or author containing JavaScript code; the code should not execute.