Bug 1227098 (CVE-2015-3213)

Summary: CVE-2015-3213 Gnome clutter: screenlock bypass by performing certain mouse gestures
Product: [Other] Security Response Reporter: Kurt Seifried <kseifried>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jrusnack, otaylor, rstrode, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
A flaw was found in the way clutter processed certain mouse and touch gestures. An attacker could use this flaw to bypass the screen lock.
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-07-27 23:43:05 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1227103, 1227104    
Bug Blocks: 1227100    

Description Kurt Seifried 2015-06-01 22:52:37 UTC
Ray Strode of Red Hat reports:

Clutter contains APIs for recognizing finger and mouse movement based gestures.
GNOME Shell uses these APIs to recognize when the user lifts the "screen shield"
to initiate the screen unlock process (where a password would normally be 

A bug in clutter's gesture handling code leads to a crash in some cases when 
the user performs gestures. This crash can lead to screen lock bypass. The bug 
was fixed upstream in clutter 1.16.2

External reference:

Comment 4 errata-xmlrpc 2015-07-27 22:27:03 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:1510 https://rhn.redhat.com/errata/RHSA-2015-1510.html