Actually two far more useful solutions:
1) By default only answer requests from 'lan' network in
/etc/config/uhttp instead of 0.0.0.0/32
2) Some useful alert if what appears to be a firewally misconfiguration
is created (default OpenWrt firewall block LuCI on WAN, therefore the
current issue is that by default uhttpd listens on all addresses, not
just lan AND user has broken their firewall and allowed HTTP access to
the router on the WAN in the *firewall* config.
Of the two 2) is harder and takes more work.
Regards,
Daniel
On 2015-09-13 10:28 AM, Daniel Dickinson wrote:
Quite frankly if someone has unintionally exposed LuCI to the internet I
think they've got a lot bigger problem than exposed version information,
and that not putting the version information at best delays only very
slightly a would be attacker.
And for properly configured installs, the version information is
extremely useful for doing support and such like.
Not that it likely means much, by vote is against such weak bandaid to
what is fundamentally an issue a user creates for themselves that is
much larger than the details of what's on the screen.
What would be more relevent solution is for LuCI to have a banner that
indicates that the LuCI is visible on the WAN, thus alerting the user to
a misconfiguration, if it is that.
Regards,
Daniel
On 2015-09-13 10:21 AM, MauritsVB wrote:
At the moment the OpenWRT www login screen provides *very* detailed
version information before anyone has even entered a password. It
displays not just “15.05” or “Chaos Calmer” but even the exact git
version on the banner.
While it’s not advised to open this login screen to the world, fact is
that it does happen intentionally or accidentally. Just a Google
search for “Powered by LuCI Master (git-“ will provide many accessible
OpenWRT login screens, including exact version information.
As soon as someone discovers a vulnerability in a OpenWRT version all
an attacker needs to do is perform a Google search to find many
installations with versions that are vulnerable (even if a patch is
already available).
In the interest of hardening the default OpenWRT install, can I
suggest that by default OpenWRT doesn’t disclose the version (not even
15.05 or “Chaos Calmer”) on the login screen? For extra safety I would
even suggest to leave “OpenWRT” off the login screen, the only people
who should use this screen already know it’s running OpenWRT.
Any thoughts?
Maurits
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