CVE-2017-7678 : Security Advisory and Response

Apache Spark XSS Web UI MHTML Vulnerability

Understanding CVE-2017-7678

This CVE describes a vulnerability in Apache Spark that allows an attacker to exploit a user's trust in the server to execute malicious scripts on Windows-based clients.

What is CVE-2017-7678?

Prior to version 2.2.0 of Apache Spark, this vulnerability enables attackers to deceive users into submitting data, such as MHTML, to Spark servers via a shared cluster, leading to script execution on client machines.

The Impact of CVE-2017-7678

Attackers can trick users into executing malicious scripts by reflecting submitted data back to them through Spark web UI elements.

Technical Details of CVE-2017-7678

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

In Apache Spark before version 2.2.0, attackers can exploit user trust to execute scripts on Windows clients by deceiving them into submitting data to Spark servers.

Affected Systems and Versions

Apache Spark versions prior to 2.2.0 are vulnerable to this exploit.

Exploitation Mechanism

Attackers deceive users into clicking on a hyperlink that directs them to a shared Spark cluster, submitting data that may contain a script, which is then reflected back to the user for potential execution.

Mitigation and Prevention

Protecting systems from CVE-2017-7678 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Apache Spark to version 2.2.0 or newer to mitigate this vulnerability.
Educate users to avoid clicking on suspicious links or submitting data to untrusted sources.

Long-Term Security Practices

Implement strict security policies and user training to prevent social engineering attacks.
Regularly monitor and audit user activities on Spark clusters to detect any suspicious behavior.

Patching and Updates

Stay informed about security updates and patches released by Apache Spark to address vulnerabilities like CVE-2017-7678.