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https://bugzilla.mindrot.org/show_bug.cgi?id=3057

Bug ID: 3057
Summary: Fork-bomb when misconfiguring a host to ProxyJump onto
itself
Product: Portable OpenSSH
Version: 7.9p1
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: ssh
Assignee: unassigned-bugs@mindrot.org
Reporter: andrej@kacian.sk

Following configuration causes ssh to spawn endless copies of itself
when user tries to connect to the specified host.

Host foo
ProxyJump foo

# or more generic
Host *
ProxyJump %h

I have reproduced this on 7.9p1 on Suse Linux Enterprise Server 15 and
on 7.4p1 on Debian Stretch (currently oldstable).

Depending on limits configured on the server, this, like any other
forkbomb, can cause all kinds of fun behavior on the local server.

Perhaps the client could check for this edge case and avoid trying to
make an impossible proxy connection.

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