CVE-2020-11767 : Vulnerability Insights and Analysis

Istio through 1.5.1 and Envoy through 1.14.1 have a data-leak issue related to TCP connections and SNI over HTTPS. This vulnerability can lead to sensitive data leakage between domains.

Understanding CVE-2020-11767

This CVE involves a data-leak issue in Istio and Envoy versions up to 1.5.1 and 1.14.1, respectively.

What is CVE-2020-11767?

The vulnerability allows for a misdirected request scenario where sensitive data can be sent to the wrong server due to connection reuse.

The Impact of CVE-2020-11767

The issue can compromise data security by allowing sensitive information to be sent to unintended servers, bypassing domain security models.

Technical Details of CVE-2020-11767

This section covers the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises from the reuse of TCP connections in scenarios involving shared caching forward proxies.

Affected Systems and Versions

Istio versions up to 1.5.1
Envoy versions up to 1.14.1

Exploitation Mechanism

TCP connections negotiated with SNI over HTTPS
Misdirected requests due to connection reuse

Mitigation and Prevention

Protecting systems from CVE-2020-11767 requires specific actions.

Immediate Steps to Take

Update Istio and Envoy to patched versions
Implement network segmentation to limit data exposure

Long-Term Security Practices

Regularly review and update network security policies
Conduct security audits to identify vulnerabilities

Patching and Updates

Apply patches provided by Istio and Envoy to address the data-leak issue