CVE-2021-23345 : What You Need to Know

A Server-side Request Forgery (SSRF) vulnerability has been identified in all versions of the package github.com/thecodingmachine/gotenberg. This vulnerability is exploited through the /convert/html endpoint when referencing internal system files in HTML elements, potentially leading to unauthorized access.

Understanding CVE-2021-23345

This section provides insights into the nature of the vulnerability and its implications.

What is CVE-2021-23345?

CVE-2021-23345, also known as a Server-side Request Forgery (SSRF) vulnerability, affects the github.com/thecodingmachine/gotenberg package. The flaw allows attackers to manipulate the src attribute of an HTML element to trigger requests to internal system files, compromising security.

The Impact of CVE-2021-23345

The vulnerability poses a medium risk, with a CVSS base score of 5.3. It can be exploited remotely without authentication. This could result in unauthorized access to sensitive files and data stored on the server.

Technical Details of CVE-2021-23345

Explore the specific technical aspects of the vulnerability.

Vulnerability Description

The SSRF vulnerability in github.com/thecodingmachine/gotenberg enables attackers to perform unauthorized requests to internal system files through the /convert/html endpoint, potentially leading to data exfiltration or server compromise.

Affected Systems and Versions

All versions of github.com/thecodingmachine/gotenberg are impacted by this vulnerability.

Exploitation Mechanism

By crafting a malicious request to the /convert/html endpoint with an HTML element containing a src attribute pointing to an internal system file (e.g., file:///etc/passwd), an attacker can trigger the SSRF flaw.

Mitigation and Prevention

Learn how to protect your systems from potential exploitation and mitigate risks associated with CVE-2021-23345.

Immediate Steps to Take

To address this vulnerability, developers are advised to update the affected package to a patched version as soon as possible. Additionally, ensure that untrusted sources are not allowed to reference internal system files.

Long-Term Security Practices

Implement strict input validation and filtering to prevent unauthorized requests to internal resources. Regularly monitor and audit network traffic for suspicious activities.

Patching and Updates

Stay informed about security updates and patches released by the package maintainers. Timely application of patches can help safeguard systems against known vulnerabilities.