Well, be obviously fail here on the "promptly" part.
No, not having web access because of the installation is not a security
vulnerability. What would allow one to gain full access to that machine
would be considered a security vulnerability (or any other such
"malicious access", "denial of service", etc.)
There's sadly not enough information here to be able to properly
diagnose the issue. The ideal way to know what happened would be to have
a packet capture of the traffic as coming in and out of the Ubuntu
system, and possibly a similar packet capture for the same timeframe
from another system. It might also be helpful to add the file
/var/log/syslog from the Ubuntu machine.
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/299942
Title:
Network-Manager wouldn't hold subnet, further disrupted entire network
Status in “network-manager” package in Ubuntu:
Incomplete
Bug description:
I administer a network that runs approximately 11-14 Windows
installations, 3 Macs, and 1 standard Linux setup. I recently tried
to upgrade my Linux box to the Ibex. No problems, except My Subnet
Mask wouldn't stick in the Edit screen of Network Manager. I have
each machine on static IP, and hence, the need to input my own subnet.
This problem, however, exists in Opensuse 11, as well, so I figured
eventually I would perform a work-around as I've done in the past.
The problem wasn't the subnet, however, it's the fact that the Ubuntu
box actually disrupted my entire network! All my machines plug into a
basic, 24-port Cisco switch. Which feeds from a Dual Wan Router, and
two DSL lines. I actually replaced the firmware on the router, bought
a new switch, and called my ISP, all this before I realized the Ubuntu
box took it all down! Turned off the Ibex machine, and all was fixed.
I have no idea what caused this, as my entire network was down for the
day-that was my main concern, and I'm lucky my employer trusts me enough to
know that I would never intentionally put something on the network that would
compromise the work-machines.
It wasn't until the afternoon, when with a new switch the network again went
down, that I went over to the Ubuntu box and realized THAT WAS WHAT HAS CHANGED
IN THE PAST 24 hours!...
Just need to get this piece of information into the right hands,
please note this computer had a FRESH install of Ubuntu Gnome, no
Samba config, not even updated yet, as I couldn't get the subnet to
stick...
Thanks,
Anthony M.
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