CVE-2021-40822 : Vulnerability Insights and Analysis

GeoServer through 2.18.5 and 2.19.x through 2.19.2 allows SSRF via the option for setting a proxy host.

Understanding CVE-2021-40822

GeoServer versions through 2.18.5 and 2.19.2 have a vulnerability that can lead to SSRF through a proxy host setting.

What is CVE-2021-40822?

CVE-2021-40822 is a vulnerability found in GeoServer versions 2.18.5 and 2.19.x up to 2.19.2, enabling Server-Side Request Forgery (SSRF) via a specific proxy host configuration.

The Impact of CVE-2021-40822

This vulnerability allows an attacker to manipulate the proxy host setting, potentially leading to unauthorized access to internal systems or services via SSRF.

Technical Details of CVE-2021-40822

GeoServer's vulnerability includes the following technical details:

Vulnerability Description

The issue arises from the improper handling of proxy host configurations within GeoServer.

Affected Systems and Versions

GeoServer versions through 2.18.5
GeoServer versions through 2.19.2

Exploitation Mechanism

The vulnerability is exploited by configuring a malicious proxy host, tricking GeoServer into making unintentional requests to internal resources.

Mitigation and Prevention

It is crucial to take immediate and long-term actions to mitigate the risks associated with CVE-2021-40822.

Immediate Steps to Take

Update GeoServer to version 2.19.3 or later to patch the SSRF vulnerability.
Review and restrict proxy host configurations to trusted sources.

Long-Term Security Practices

Regularly monitor and audit proxy configurations within GeoServer.
Educate users on the risks of SSRF attacks and best security practices.

Patching and Updates

GeoServer has released version 2.19.3 containing the necessary fixes to address the SSRF vulnerability.