Source: cve@mitre.org
PHPJabbers File Sharing Script 1.0 has stored XSS in the comments section.
PHPJabbers File Sharing Script 1.0 is vulnerable to a stored cross-site scripting (XSS) attack, allowing attackers to inject malicious JavaScript into the comments section. This vulnerability can lead to account compromise, session hijacking, and defacement of the affected website, potentially impacting user trust and data integrity.
Step 1: Payload Delivery: An attacker crafts a malicious HTML payload containing JavaScript (e.g., <script>alert('XSS')</script>) and submits it as a comment in the PHPJabbers File Sharing Script 1.0 comments section.
Step 2: Data Storage: The script stores the attacker's malicious comment, including the JavaScript payload, in the database without sanitization.
Step 3: User Interaction: A legitimate user visits the page containing the malicious comment.
Step 4: Payload Execution: The script retrieves the comment from the database and renders it on the webpage. Because the input was not sanitized, the browser executes the injected JavaScript payload.
Step 5: Attack Outcome: The injected JavaScript executes within the context of the user's browser, enabling the attacker to perform actions such as stealing cookies, redirecting the user, or defacing the website.
The vulnerability stems from a lack of proper input validation and output encoding in the comments section of PHPJabbers File Sharing Script 1.0. Specifically, the script fails to sanitize user-supplied input before storing it in the database and rendering it on the webpage. This allows attackers to inject arbitrary HTML and JavaScript code into the comments. When other users view the comments, their browsers execute the malicious JavaScript, leading to the XSS attack. The root cause is a missing or inadequate implementation of HTML encoding or input validation on the comment submission form and display logic.
While no specific APTs are directly linked to this CVE, the ease of exploitation makes it attractive to a wide range of attackers, including script kiddies and opportunistic attackers. The impact on a website could be used by APTs for initial access or to establish a foothold. CISA KEV status: Not Listed.
Monitor web server logs for suspicious activity, such as unusual HTTP requests containing <script> tags or other HTML entities in comment submissions.
Implement a Web Application Firewall (WAF) with rules to detect and block XSS attempts, specifically targeting the comments section.
Analyze database entries for comments containing HTML tags or JavaScript code.
Monitor user activity for unusual behavior, such as unexpected redirects or cookie theft, which could indicate a successful XSS attack.
Use a vulnerability scanner to identify the vulnerability.
Implement robust input validation to sanitize all user-supplied data before storing it in the database. This includes filtering out or encoding HTML tags and JavaScript code.
Implement output encoding (e.g., HTML encoding) to ensure that user-supplied data is properly escaped when displayed on the webpage.
Upgrade to a patched version of PHPJabbers File Sharing Script or a different file sharing solution. If no patch is available, consider removing the comments section.
Use a Content Security Policy (CSP) to restrict the sources from which the browser can load resources, mitigating the impact of XSS attacks.
Regularly scan the website for vulnerabilities.