Bug 1283279 (CVE-2015-7496) - CVE-2015-7496 gdm: Crash when holding Escape in log screen
Summary: CVE-2015-7496 gdm: Crash when holding Escape in log screen
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2015-7496
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1283281
Blocks: 1283283
TreeView+ depends on / blocked
 
Reported: 2015-11-18 15:21 UTC by Adam Mariš
Modified: 2019-09-29 13:40 UTC (History)
2 users (show)

Fixed In Version: gdm 3.19.2
Doc Type: Bug Fix
Doc Text:
It was found that gdm could crash due to a signal handler dispatched to an invalid conversation. An attacker could crash gdm by holding the escape key when the screen is locked, possibly bypassing the locked screen.
Clone Of:
Environment:
Last Closed: 2017-08-03 08:40:54 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2128 0 normal SHIPPED_LIVE Moderate: gdm and gnome-session security, bug fix, and enhancement update 2017-08-01 19:38:38 UTC

Description Adam Mariš 2015-11-18 15:21:21 UTC 
It was found that when running gnome session, user locks the machine (by pressing <super> + l), presses Escape and holds, gdm will crash causing segmentation fault.

Upstream bug:

https://bugzilla.gnome.org/show_bug.cgi?id=758032

Upstream patches:

https://git.gnome.org/browse/gdm/commit/?id=5ac2246
https://git.gnome.org/browse/gdm/commit/?id=05e5fc2
Comment 1 Adam Mariš 2015-11-18 15:21:37 UTC 
Created gdm tracking bugs for this issue:

Affects: fedora-all [bug 1283281]
Comment 2 Fedora Update System 2015-11-22 02:23:00 UTC 
gdm-3.18.2-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 3 errata-xmlrpc 2017-08-01 22:59:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2128 https://access.redhat.com/errata/RHSA-2017:2128
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