CVE-2021-3374 : Exploit Details and Defense Strategies

A directory traversal vulnerability in RStudio Shiny Server before version 1.5.16 can allow attackers to read the application source code due to an encoded slash.

Understanding CVE-2021-3374

This section dives into the details of the CVE-2021-3374 vulnerability.

What is CVE-2021-3374?

CVE-2021-3374 is a directory traversal vulnerability in RStudio Shiny Server that enables malicious actors to access and read the application source code by exploiting an encoded slash.

The Impact of CVE-2021-3374

This vulnerability could lead to unauthorized disclosure of sensitive information stored in the application source code, potentially compromising the confidentiality of the data and intellectual property.

Technical Details of CVE-2021-3374

Explore the technical aspects related to CVE-2021-3374 vulnerability.

Vulnerability Description

The vulnerability arises from a lack of proper input validation, allowing attackers to traverse directories and access files beyond the intended scope, exposing the application source code.

Affected Systems and Versions

RStudio Shiny Server versions before 1.5.16 are susceptible to this directory traversal issue, impacting the security of the server and the confidentiality of the hosted applications.

Exploitation Mechanism

By manipulating certain parameters in the server requests, threat actors can input malicious path values that exploit the directory traversal vulnerability and retrieve sensitive files.

Mitigation and Prevention

Discover the necessary steps to mitigate the risks posed by CVE-2021-3374.

Immediate Steps to Take

Users are advised to update RStudio Shiny Server to version 1.5.16 or later to eliminate the directory traversal vulnerability and enhance the security posture of the server.

Long-Term Security Practices

Implement strict input validation mechanisms and access controls to prevent directory traversal attacks and ensure the integrity of the application source code.

Patching and Updates

Regularly monitor security advisories from RStudio and apply patches promptly to address any newly discovered vulnerabilities and bolster the overall security of the server and the hosted applications.