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Google Online Security Blog: October 2016
Security Blog
The latest news and insights from Google on security and safety on the Internet
Distrusting WoSign and StartCom Certificates
October 31, 2016
Posted by Andrew Whalley, Chrome Security
Certificate Authorities (CAs) play a key role in web security by issuing digital certificates to website operators. These certificates are trusted by browsers to authenticate secure connections to websites. CAs who issue certificates outside the policies required by browsers and industry bodies can put the security and privacy of every web user at risk.
Google has determined that two CAs, WoSign and StartCom, have not maintained the high standards expected of CAs and will no longer be trusted by Google Chrome, in accordance with our
Root Certificate Policy
. This view is similar to the recent announcements by the root certificate programs of both
Apple
and
Mozilla
. The rest of this post provides background to that decision and how we plan to minimize disruption while still protecting users.
Background
On August 17, 2016, Google was notified by GitHub's security team that WoSign had issued a certificate for one of GitHub's domains without their authorization. This prompted an investigation, conducted in public as a collaboration with Mozilla and the security community, which found a number of other cases of
WoSign misissuance
.
The investigation concluded that WoSign knowingly and intentionally misissued certificates in order to circumvent browser restrictions and CA requirements. Further, it determined that StartCom, another CA, had been purchased by WoSign, and had replaced infrastructure, staff, policies, and issuance systems with WoSign's. When presented with this evidence, WoSign and StartCom management actively attempted to mislead the browser community about the acquisition and the relationship of these two companies. For both CAs, we have concluded there is a pattern of issues and incidents that indicate an approach to security that is not in concordance with the responsibilities of a publicly trusted CA.
Action
Beginning with Chrome 56, certificates issued by WoSign and StartCom after October 21, 2016 00:00:00 UTC will not be trusted. Certificates issued before this date may continue to be trusted, for a time, if they comply with the
Certificate Transparency in Chrome
policy or are issued to a limited set of domains known to be customers of WoSign and StartCom.
Due to a number of technical limitations and concerns, Google Chrome is unable to trust all pre-existing certificates while ensuring our users are sufficiently protected from further misissuance. As a result of these changes, customers of WoSign and StartCom may find their certificates no longer work in Chrome 56.
In subsequent Chrome releases, these exceptions will be reduced and ultimately removed, culminating in the full distrust of these CAs. This staged approach is solely to ensure sites have the opportunity to transition to other Certificate Authorities that are still trusted in Google Chrome, thus minimizing disruption to users of these sites. Sites that find themselves on this whitelist will be able to request early removal once they’ve transitioned to new certificates. Any attempt by WoSign or StartCom to circumvent these controls will result in immediate and complete removal of trust.
We remain committed to ensuring the safety and privacy of Google Chrome users. We appreciate the impact to users visiting sites with affected certificates and to the operators who run these sites, but the nature of these incidents, and the need to protect our users, prevent us from being able to take less disruptive steps.
Disclosing vulnerabilities to protect users
October 31, 2016
Posted by Neel Mehta and Billy Leonard, Threat Analysis Group
On Friday, October 21st, we reported 0-day vulnerabilities — previously publicly-unknown vulnerabilities — to Adobe and Microsoft. Adobe updated Flash
on October 26th
to address CVE-2016-7855; this update is available via Adobe's updater and Chrome auto-update.
After 7 days, per our
published policy for actively exploited critical vulnerabilities
, we are today disclosing the existence of a remaining critical vulnerability in Windows for which no advisory or fix has yet been released. This vulnerability is particularly serious because we know it is being actively exploited.
The Windows vulnerability is a local privilege escalation in the Windows kernel that can be used as a security sandbox escape. It can be triggered via the win32k.sys system call NtSetWindowLongPtr() for the index GWLP_ID on a window handle with GWL_STYLE set to WS_CHILD. Chrome's sandbox blocks win32k.sys system calls using the
Win32k lockdown
mitigation on Windows 10, which prevents exploitation of this sandbox escape vulnerability.
We encourage users to verify that auto-updaters have already updated Flash — and to manually update if not — and to apply Windows patches from Microsoft when they become available for the Windows vulnerability.
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