Bug 1318305 - Disable X11Forwarding in openssh
Summary: Disable X11Forwarding in openssh
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: openssh
Version: 7.3
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Jakub Jelen
QA Contact: BaseOS QE Security Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-03-16 13:25 UTC by Josh Bressers
Modified: 2016-03-21 16:12 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-03-21 16:12:53 UTC
Target Upstream Version:

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Description Josh Bressers 2016-03-16 13:25:15 UTC 
Bug 1316829 describes an issue with X11Forwarding in sshd. We enable this by default. Upstream does not.

We should consider disabling this by default to reduce our attack surface.
Comment 2 Tomas Mraz 2016-03-16 14:04:22 UTC 
That would get us a huge backslash - And we definitely cannot do this change on already installed systems.

And the X forwarding does not really increase the attack surface in normal use cases because it happens in the user process. It matters only in case the forced command feature is in effect.
Comment 6 Josh Bressers 2016-03-21 16:12:53 UTC 
Given the conversations and feedback, we will not be considering changing this default.
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