CVE-2021-29106 Explained : Impact and Mitigation

A reflected Cross Site Scripting (XSS) vulnerability has been identified in Esri ArcGIS Server version 10.8.1 and below. This could potentially allow a remote attacker to execute arbitrary JavaScript code in the user's browser by convincing them to click on a malicious link.

Understanding CVE-2021-29106

This section will provide insights into the nature of the vulnerability and its impact.

What is CVE-2021-29106?

The CVE-2021-29106 is a reflected Cross Site Scripting (XSS) vulnerability in Esri ArcGIS Server version 10.8.1 and earlier. The vulnerability may enable a remote attacker to execute arbitrary JavaScript code in a user's browser through a crafted link.

The Impact of CVE-2021-29106

The impact of this vulnerability is rated as MEDIUM with a CVSS base score of 4.7. While the availability impact is none, the confidentiality and integrity impacts are low. Successful exploitation requires user interaction.

Technical Details of CVE-2021-29106

In this section, we will delve into the specific technical details related to CVE-2021-29106.

Vulnerability Description

The vulnerability identified in Esri ArcGIS Server version 10.8.1 and below allows a remote attacker to conduct reflected Cross Site Scripting (XSS) attacks, potentially leading to the execution of arbitrary JavaScript code in the victim's browser.

Affected Systems and Versions

The affected platform is x64, and the impacted product is ArcGIS Server by Esri. Versions below 10.9.0 are susceptible to this vulnerability.

Exploitation Mechanism

To exploit this vulnerability, an attacker would need to convince a user to click on a specially crafted link. Upon clicking, the attacker could execute malicious JavaScript code in the victim's browser.

Mitigation and Prevention

This section outlines the necessary steps to mitigate and prevent the exploitation of CVE-2021-29106.

Immediate Steps to Take

Users are advised to update their Esri ArcGIS Server to version 10.9.0 or above to mitigate the risk of exploitation. Additionally, exercise caution while clicking on unknown or suspicious links.

Long-Term Security Practices

In the long term, organizations are encouraged to implement security best practices, conduct regular security assessments, and provide ongoing security awareness training to users to prevent similar vulnerabilities.

Patching and Updates

Esri has released an update addressing this vulnerability. Users should apply the patch provided by Esri to secure their ArcGIS Server installations.