I recently upgraded to Linux Mint 14 “nadia”, which is based on Ubuntu 12.10. I use dnsmasq as a local DHCP server and DNS resolver for virtual machines. Installing dnsmasq on Linux Mint 14 broke host DNS resolution. The issue is easily reproducible: stop dnsmasq, DNS stops working. Start dnsmasq, and it works again.
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Tags: dnsmasq, linuxmint, quantal, ubuntu, virtualbox
In another post, I talked about running Wireshark and other sniffing programs as an unprivileged user. You can do the same with Nmap, but it’s a little more tricky.
WARNING: This is dangerous. The Nmap Scripting Engine (NSE) allows scripts to sniff the network, change firewall roules and interface configuration, or exploit vulnerabilities including on localhost. It’s possible, especially with elevated capabilities, for a clever person to use Nmap and NSE to escalate to full root privileges. If you do not understand these risks, do not do this.
Tags: networking, nmap, security
The Wireshark team has long warned us not to run Wireshark as root. However, since Wireshark 1.4 (between Ubuntu 10.04 and 12.04), they’ve raised the stakes. Wireshark no longer loads all its plugins and protocol dissectors when run by root, and it displays warning messages on the CLI and the GUI:
root@laptop:~# tshark tshark: Lua: Error during loading: [string "/usr/share/wireshark/init.lua"]:45: dofile has been disabled Running as user "root" and group "root". This could be dangerous.
Tags: networking, security, wireshark
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