CVE-2019-13948 : Security Advisory and Response

SyGuestBook A5 Version 1.2 has a vulnerability that could lead to stored XSS attacks due to inadequate blocking of XSS payloads in the isValidData function.

Understanding CVE-2019-13948

This CVE involves a stored XSS vulnerability in SyGuestBook A5 Version 1.2, allowing attackers to exploit the isValidData function in include/functions.php.

What is CVE-2019-13948?

The vulnerability in SyGuestBook A5 Version 1.2 enables attackers to execute stored XSS attacks by utilizing a crafted onerror attribute in an IMG element.

The Impact of CVE-2019-13948

The vulnerability could result in unauthorized access to sensitive data, manipulation of content, and potential security breaches on affected systems.

Technical Details of CVE-2019-13948

SyGuestBook A5 Version 1.2 vulnerability details and exploitation mechanisms.

Vulnerability Description

The isValidData function in include/functions.php fails to adequately block XSS payloads, allowing attackers to inject malicious scripts.

Affected Systems and Versions

Product: SyGuestBook A5 Version 1.2
Vendor: Not applicable
Version: Not applicable

Exploitation Mechanism

Attackers can exploit this vulnerability by inserting a crafted onerror attribute in an IMG element to execute malicious scripts.

Mitigation and Prevention

Steps to mitigate and prevent the exploitation of CVE-2019-13948.

Immediate Steps to Take

Disable the SyGuestBook A5 Version 1.2 application until a patch is available.
Implement input validation to sanitize user inputs and prevent XSS attacks.
Regularly monitor and audit the application for any suspicious activities.

Long-Term Security Practices

Keep software and applications up to date with the latest security patches.
Educate developers and users on secure coding practices to prevent similar vulnerabilities.

Patching and Updates

Apply patches or updates provided by the software vendor to address the XSS vulnerability in SyGuestBook A5 Version 1.2.