Bug 1050745 (CVE-2013-7273) - CVE-2013-7273 gdm: local DoS possible when cancelling and disable-user-list=true when fallback greeter is used
Summary: CVE-2013-7273 gdm: local DoS possible when cancelling and disable-user-list=t...
Alias: CVE-2013-7273
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1050746 1050747
TreeView+ depends on / blocked
Reported: 2014-01-09 01:22 UTC by Vincent Danen
Modified: 2019-09-29 13:12 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2019-06-08 02:31:12 UTC

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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.

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