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Date: Mon, 1 Jan 2018 11:05:14 -0500
From: Nightwatch Cybersecurity Research <research@...htwatchcybersecurity.com>
To: fulldisclosure@...lists.org
Subject: [FD] ChromeOS Doesn’t Always Use SSL During Startup [CVE-2017-15397]

[Original at: https://wwws.nightwatchcybersecurity.com/2018/01/01/chromeos-doesnt-always-use-ssl-during-startup-cve-2017-15397/]

SUMMARY

ChromeOS did not use SSL in all network calls originating from the
ChromeVox component during startup. This could potentially have
allowed an MITM attacker to inject content into ChromeOS or crash the
device. The vendor (Google) fixed this issue in Chrome M62. Google has
assigned CVE-2017-15397 to track this issue.

DETAILS

ChromeOS is the operating system developed by Google that runs on
ChromeBook devices. It is build on top of Linux and around the Chrome
browser.

By monitoring network traffic using a proxy we noticed that some
network calls originating from the ChromeVox component did not use
SSL. These calls occured during the startup process before a user
logged in. Because these calls did not use SSL, it would be possible
for an MITM attacker, in theory, to either inject their own content
into ChromeOS, or crash the device by sending a very large packet. We
did not conduct any follow-up testing to confirm either of these two
possibilities.

To reproduce:
1. Setup a proxy with WiFi.
2. Switch ChromeOS device to use proxy.
3. Restart the device and on the login screen enable ChromeVox.
4. Observe calls to HTTP without SSL.

All testing was done on an Acer ChromeBook, running Chrome version
51.0.2704.106 *stable) and ChromeOS version 8172.62.0 (stable).

VENDOR RESPONSE

This issue was responsibly reported to the vendor via the Chromium bug
tracker. The vendor fixed this issue in ChromeOS release M62 and
assigned CVE-2017-15397 to track it.

REFERENCES

CVE ID: CVE-2017-15397 -
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15397
Chromium Bug # 627300 -
https://bugs.chromium.org/p/chromium/issues/detail?id=627300

Bounty Information

This bug qualified for a bounty under the terms of the Google Chrome
Rewardsbounty program, and a bounty payment has been received.

Credits

Advisory written by Yakov Shafranovich.

Timeline

2016-07-12: Initial report to the vendor
2017-09-18: Issue patched by the vendor
2017-10-26: CVE assigned by the vendor
2018-01-01: Public disclosure

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