CVE-2019-9845 : What You Need to Know

Miniblog.Core until 2019-01-16 allows remote attackers to run unauthorized ASPX code through a vulnerability in the BlogController.cs file.

Understanding CVE-2019-9845

In Miniblog.Core until 2019-01-16, a specific vulnerability exists that enables remote attackers to execute unauthorized ASPX code.

What is CVE-2019-9845?

The vulnerability in Miniblog.Core allows attackers to run unauthorized ASPX code by utilizing an IMG element with a data: URL, exploiting the SaveFilesToDisk function in the BlogController.cs file.

The Impact of CVE-2019-9845

This vulnerability can be exploited by remote attackers to execute arbitrary ASPX code, potentially leading to unauthorized access and manipulation of the system.

Technical Details of CVE-2019-9845

Miniblog.Core until 2019-01-16 is susceptible to remote code execution due to improper validation in the BlogController.cs file.

Vulnerability Description

The issue arises from the failure to validate file extensions before writing a decoded base64 string to a file, allowing attackers to execute unauthorized ASPX code.

Affected Systems and Versions

Product: Miniblog.Core
Vendor: N/A
Versions: All versions until 2019-01-16

Exploitation Mechanism

Attackers can exploit this vulnerability by using an IMG element with a data: URL to execute unauthorized ASPX code.

Mitigation and Prevention

To address CVE-2019-9845, follow these steps:

Immediate Steps to Take

Implement input validation to ensure files are properly sanitized.
Regularly monitor and update the Miniblog.Core application to the latest secure version.

Long-Term Security Practices

Conduct regular security audits and code reviews to identify and address vulnerabilities.
Educate developers on secure coding practices to prevent similar issues in the future.

Patching and Updates

Apply patches and updates provided by Miniblog.Core to fix the vulnerability and enhance system security.