CVE-2021-29116 Explained : Impact and Mitigation

A stored Cross Site Scripting (XSS) vulnerability in Esri ArcGIS Server feature services versions 10.8.1 and 10.9 (only) may allow a remote, unauthenticated attacker to execute arbitrary JavaScript code.

Understanding CVE-2021-29116

This CVE identifies a stored XSS vulnerability in ArcGIS Server feature services, potentially leading to the execution of malicious code in a user's browser.

What is CVE-2021-29116?

CVE-2021-29116 highlights a stored Cross Site Scripting (XSS) vulnerability in specific versions of Esri ArcGIS Server feature services, enabling attackers to store and execute malicious scripts through crafted queries.

The Impact of CVE-2021-29116

The vulnerability poses a medium severity threat, allowing remote, unauthenticated attackers to manipulate and execute arbitrary JavaScript code in the browser, impacting the confidentiality and integrity of user data.

Technical Details of CVE-2021-29116

The technical details of CVE-2021-29116 include vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability lies in ArcGIS Server feature services versions 10.8.1 and 10.9, permitting the storage of malicious scripts in the server which can be executed to compromise user systems.

Affected Systems and Versions

Esri's ArcGIS Server versions 10.8.1 and 10.9 (only) are impacted, specifically on the x64 platform.

Exploitation Mechanism

Attackers can exploit this vulnerability by passing and storing malicious strings through specially crafted queries, eventually executing arbitrary JavaScript code in the user's browser.

Mitigation and Prevention

Understanding the steps to mitigate the risk and prevent future vulnerabilities is crucial.

Immediate Steps to Take

Securing the feature services can help mitigate the risk associated with CVE-2021-29116. Regular monitoring and updates are recommended.

Long-Term Security Practices

Implementing robust security measures, conducting regular security audits, and educating users about safe browsing practices can enhance long-term security.

Patching and Updates

Esri has released an update patch that addresses the vulnerability. It is essential to apply the patch promptly to secure ArcGIS Server feature services.