CVE-2020-1044 : Exploit Details and Defense Strategies

SQL Server Reporting Services (SSRS) is affected by a security feature bypass vulnerability that allows attackers to upload disallowed file types.

Understanding CVE-2020-1044

A security feature bypass vulnerability in SQL Server Reporting Services (SSRS) enables attackers to upload unauthorized files by exploiting a validation flaw in attachment uploads.

What is CVE-2020-1044?

The vulnerability arises from incorrect validation of attachments in SSRS, permitting the upload of prohibited file types.
Attackers can exploit this by sending a crafted request to a vulnerable SSRS server.

The Impact of CVE-2020-1044

Successful exploitation enables attackers to bypass security features and upload unauthorized files on the affected SSRS server.
An authenticated attacker can execute this attack by sending a specially crafted request.

Technical Details of CVE-2020-1044

SQL Server Reporting Services Security Feature Bypass Vulnerability has the following technical aspects:

Vulnerability Description

The vulnerability allows for the bypass of security features, leading to unauthorized attachment uploads in SSRS.

Affected Systems and Versions

Vendor: Microsoft
Affected Products: SQL Server 2017 Reporting Services (version 14.0.0) and SQL Server 2019 Reporting Services (version 15.0.0)
Platforms: Unknown

Exploitation Mechanism

Attackers need to be authenticated to send the specially crafted request to exploit this vulnerability.

Mitigation and Prevention

To address CVE-2020-1044, follow these steps:

Immediate Steps to Take

Apply the security update provided by Microsoft.
Regularly monitor and restrict attachments within SSRS to prevent unauthorized file uploads.

Long-Term Security Practices

Implement strict attachment upload policies and restrictions.
Conduct regular security assessments and audits of SSRS configurations.

Patching and Updates

Update to the latest version of SQL Server Reporting Services to patch the vulnerability.