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:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rstrode
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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:
Embargoed:
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.