Intel CrossWalk project does not validate SSL certificates after first acceptance

Overview

The Intel Crosswalk project is a framework for developing hybrid apps for Android and iOS. The Crosswalk project does not properly handle SSL certificate validation when a user accepts an invalid certificate, preventing the app for validating any future SSL certificates.

Description

CWE-356**: Product UI does not Warn User of Unsafe Actions**** -**CVE-2016-5672

When a user makes a network request, an app using the Crosswalk project shows an initial error message if an invalid SSL certificate is found. If the user selects “OK”, the app then accepts all future SSL certificates without validation. The app does not make it clear that the dialog grants permanent permission to accept invalid certificates; the user is never prompted again.

The researcher has released a security advisory with more information. Intel has also released a blog post about this issue.

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Impact

A victim user that is enticed to accept an invalid SSL certificate actually accepted invalid SSL certificates indefinitely from any source, allowing possible man-in-the-middle attacks in the future from other sources.

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Solution

Apply an update

The issue has been resolved in Crosswalk stable 19.49.514.5. Affected users are encouraged to upgrade as soon as possible. Developers should ensure their apps are rebuilt using the latest Crosswalk update.

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Vendor Information

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Intel Corporation Affected

Notified: June 03, 2016 Updated: July 29, 2016

Statement Date: July 27, 2016

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	5.8	AV:N/AC:M/Au:N/C:P/I:P/A:N
Temporal	4.5	E:POC/RL:OF/RC:C
Environmental	3.4	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• <https://wwws.nightwatchcybersecurity.com/2016/07/29/advisory-intel-crosswalk-ssl-prompt-issue&gt;
• <https://blogs.intel.com/evangelists/2016/07/28/crosswalk-security-vulnerability/&gt;

Acknowledgements

Thanks to Nightwatch Cybersecurity Research for reporting this vulnerability.

This document was written by Garret Wassermann.

Other Information

CVE IDs:	CVE-2016-5672
Date Public:	2016-07-29 Date First Published: