** Also affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1837339
Title:
CIDR's of the form 12.34.56.78/0 should be an error
Status in OpenStack Dashboard (Horizon):
Confirmed
Status in neutron:
New
Status in OpenStack Security Advisory:
Incomplete
Status in OpenStack Security Notes:
New
Bug description:
The problem is that some users do not understand how CIDRs work, and
incorrectly use /0 when they are trying to specify a single IP or a
subnet in an Access Rule. Unfortunately 12.34.56.78/0 means the same
thing as 0.0.0.0/0.
The proposed fix is to insist that /0 only be used with 0.0.0.0/0 and
the IPv6 equivalent ::/0 when entering or updating Access Rule CIDRs
in via the dashboard.
I am labeling this as a security vulnerability since it leads to naive
users creating instances with ports open to the world when they didn't
intend to do that.
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