Bug 1050745 (CVE-2013-7273)

Summary: CVE-2013-7273 gdm: local DoS possible when cancelling and disable-user-list=true when fallback greeter is used
Product: [Other] Security Response Reporter: Vincent Danen <vdanen>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rstrode
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-08 02:31:12 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: 1050746, 1050747    
Bug Blocks:    

Description Vincent Danen 2014-01-09 01:22:04 UTC
It was reported [1],[2] that when the fallback greeter is used in GDM3.x, if the disable-user-list setting is "true" (so a user list is not displayed, but entry fields for username and password), if a user enters their username and are then presented with a password prompt, if they were to click the "cancel" button then all of the user-interactive fields disappear.  The user is then unable to login in or otherwise interact with the display manager, and must either kill X or reboot.

There is no upstream fix as of yet.  CVE-2013-7273 was assigned [3] to this issue.

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683338
[2] https://bugzilla.gnome.org/show_bug.cgi?id=704284
[3] http://seclists.org/oss-sec/2014/q1/40

Comment 2 Vincent Danen 2014-01-09 01:22:59 UTC
Created gdm tracking bugs for this issue:

Affects: fedora-all [bug 1050746]

Comment 3 Vincent Danen 2014-01-09 01:26:36 UTC
This does not affect gdm 2.x.