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Bug 1490417 - (CVE-2017-12164) CVE-2017-12164 gdm: lock screen can be circumvented when autologin is set
CVE-2017-12164 gdm: lock screen can be circumvented when autologin is set
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170614,repor...
: Security
Depends On: 1484033
Blocks: 1488875
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Reported: 2017-09-11 09:51 EDT by Cedric Buissart
Modified: 2018-07-26 09:59 EDT (History)
7 users (show)

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Doc Text:
A flaw was discovered in the gdm where gdm greeter was no longer setting the ran_once boolean during autologin. If autologin was enable for a victim, an attacker could simply select 'login as another user' to unlock their screen.
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Last Closed: 2017-09-12 05:29:09 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Cedric Buissart 2017-09-11 09:51:34 EDT 
The gnome lock screen can be unlocked without needing a password. 

Steps to Reproduce:
1. Enable Automatic Login for your account
2. Reboot
3. Lock screen
4. Click on the log in as another user button below the password prompt.

Actual results:
The screen unlocks without a password being entered.

Expected results:
A selection of other accounts is shown.
Comment 1 Cedric Buissart 2017-09-12 04:53:00 EDT 
This vulnerability is a side effect of upstream https://git.gnome.org/browse/gdm/commit/?id=ff98b28, in gdm-3.24.1.
This patch is not part of gdm as shipped in RHEL 7, 6 or 5. As such, RHEL is not affected by this vulnerability.
Comment 2 Cedric Buissart 2017-09-12 05:13:39 EDT 
Acknowledgments:

Name: Tobias Guggenmos
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