Testers wanted! New FIN ACK / RST ACK Leak Test

Mike Perry recently discovered a leak bug in custom transparent proxies (not related to Whonix!) and published his findings on the tor-talk mailing list:

This leak test has been adapted for Whonix and documented here:

Fortunately, I wasn’t able to reproduce this leak using Whonix. Probably because the Linux version Whonix is using isn’t affected by this bug and/or because Whonix’s Firewall uses iptables default policy drop for input-, output-, fowardchain and only allows the Tor user to establish external connections. However, other users using different host operating systems and setups than I should repeat the test.

Please feel encouraged,
– to comprehend the original thread on the tor-talk mailing list
– verify yourself that this leak test doesn’t find a leak and share your results
– check if upstream (Linux kernel / iptables) consider this a bug and if it has already been reported (this is not clear yet)

Patrick started developing Whonix, the Anonymous Operating System in 2012, when quickly others joined efforts. He collected experiences working pseudonymous on Whonix for two years, enjoys collaboratively working on privacy preserving software.