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Bug 1147917 - (CVE-2014-7300) CVE-2014-7300 gnome-shell: lockscreen bypass with printscreen key
CVE-2014-7300 gnome-shell: lockscreen bypass with printscreen key
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20140927,reported=2...
: Security
Depends On: 1149039 1154107
Blocks: 1121513 1147918
  Show dependency tree / graph
 
Reported: 2014-09-30 05:57 EDT by Vasyl Kaigorodov
Modified: 2015-03-09 04:59 EDT (History)
4 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that the Gnome shell did not disable the Print Screen key when the screen was locked. This could allow an attacker with physical access to a system with a locked screen to crash the screen-locking application by creating a large amount of screenshots.
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Clone Of:
Environment:
Last Closed: 2015-03-06 05:05:21 EST
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Regression: ---
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0535 normal SHIPPED_LIVE Low: GNOME Shell security, bug fix, and enhancement update 2015-03-05 11:32:34 EST

  None (edit)
Description Vasyl Kaigorodov 2014-09-30 05:57:11 EDT 
It was discovered [1] that PrtSc key is not disabled when the screen is locked.

Taking a bunch of screenshots at once bloats gnome-shell to the point
where it's pretty easy to get it targeted by the kernel's oom-killer.
This means that anyone with access to the keyboard of a locked GNOME
session can (briefly) disable the lockscreen, which lets them see and
interact with the running gnome session.

This might be fixed in gnome-shell 3.14.1, some patches available in the original bugreport [1].

[1]: https://bugzilla.gnome.org/show_bug.cgi?id=737456
Comment 1 Murray McAllister 2014-10-02 22:17:43 EDT 
Created gnome-shell tracking bugs for this issue:

Affects: fedora-all [bug 1149039]
Comment 2 Vasyl Kaigorodov 2014-10-06 07:00:52 EDT 
CVE-2014-7300 was assigned for:

"PrtSc is an unauthenticated request that's available to untrusted
parties. A series of requests can consume a large amount of memory.
The combination of this PrtSc behavior and the existence of the
oom-killer allows authentication bypass for command execution.
Therefore, the product must limit the aggregate memory consumption of
all active requests, and the lack of this limit is a vulnerability."

http://seclists.org/oss-sec/2014/q4/91
Comment 3 Fedora Update System 2014-10-18 12:58:09 EDT 
gnome-shell-3.10.4-9.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 4 errata-xmlrpc 2015-03-05 08:21:57 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0535 https://rhn.redhat.com/errata/RHSA-2015-0535.html
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