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I don't know what package is responsible for this. I entered iptables
because the ip command was not recognized as a package.
I use the ip route to debug internet problems. Here it is before plugging my
cellphone through usb:
#ip route
default via 192.168.0.1 dev wlp2s0 proto dhcp metric 600
25.0.0.0/8 dev ham0 proto kernel scope link src 25.69.248.65
169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown
192.168.0.0/24 dev wlp2s0 proto kernel scope link src 192.168.0.51 metric 600
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
Here it is after I plug my cellphone
#ip route
default via 192.168.42.129 dev enp0s20f0u1 proto dhcp metric 100
default via 192.168.0.1 dev wlp2s0 proto dhcp metric 600
25.0.0.0/8 dev ham0 proto kernel scope link src 25.69.248.65
169.254.0.0/16 dev virbr0 scope link metric 1000 linkdown
192.168.0.0/24 dev wlp2s0 proto kernel scope link src 192.168.0.51 metric 600
192.168.42.0/24 dev enp0s20f0u1 proto kernel scope link src 192.168.42.114
metric 100
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
So my computer is trying to access all ips using my cellphone as a
router, which of course fails.
the command "sudo ip route del default" followed by "sudo ip route add
default via 192.168.0.1 dev wlp2s0" restores my connection.
Thank you for your attention. I'm available to answer any questions and
fix this bug. Reporting this bug was already effort diverted from my
other tasks, so let's make this count no matter how deep it cuts.
P.S: I went ahead and marked this bug as a security vulnerability
because I can think of ways this can be exploited, especially if the
cellphone can trigger the bug and route traffic so that the user doesn't
suspect it. If you feel the security impact is small and that there are
other more important security issues, feel free to unmark it and we can
deal with it's usability impact, which is probably more impactful.
Regards,
Tomás.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: iptables 1.6.1-2ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
Uname: Linux 4.15.0-99-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun May 17 22:59:02 2020
InstallationDate: Installed on 2019-02-08 (464 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: iptables
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic ip
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Charging my cellphone through usb breaks internet connection.
https://bugs.launchpad.net/bugs/1879211
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