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firefox leak dns even set socks_remote_dns to true

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613038475
613038475
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Hello, I'm using firefox with a socks 5 proxy,

I set network.proxy.socks_remote_dns to true and can confirm the socks request send to proxy server is address is domain not ip resolved.

But when I use wireshark to capture dns packet, I still can see dns query of the domain firefox visited send direct.

Is firefox resolve domain twice with proxy and direct just like chrome?

Are there some settings to turn off this?

I test firefox version 24 and 27, both has the same problem, os is windows 7 64bit.

related problem:

https://support.mozilla.org/en-US/questions/928722

I asked another guy let him use wireshark to check dns leak, same result.

I also try set network.dns.disablePrefetch to true and network.prefetch-next to false, no effect.

I create a new profile and disable all addon and plugin, no effect.

some extend information

1. domain of https link wont leak

2. run test on www.dnsleaktest.com will leak www.dnsleaktest.com

692 6.879564000 192.168.8.188 8.8.8.8 DNS 79 Standard query 0x15ed A www.dnsleaktest.com

but wont leak it's subdomain like p3zwu0pq2s.dnsleaktest.com, 9irxt5n4mi.dnsleaktest.com, ...

Hello, I'm using firefox with a socks 5 proxy, I set network.proxy.socks_remote_dns to true and can confirm the socks request send to proxy server is address is domain not ip resolved. But when I use wireshark to capture dns packet, I still can see dns query of the domain firefox visited send direct. Is firefox resolve domain twice with proxy and direct just like chrome? Are there some settings to turn off this? I test firefox version 24 and 27, both has the same problem, os is windows 7 64bit. related problem: https://support.mozilla.org/en-US/questions/928722 I asked another guy let him use wireshark to check dns leak, same result. I also try set network.dns.disablePrefetch to true and network.prefetch-next to false, no effect. I create a new profile and disable all addon and plugin, no effect. some extend information 1. domain of https link wont leak 2. run test on www.dnsleaktest.com will leak www.dnsleaktest.com 692 6.879564000 192.168.8.188 8.8.8.8 DNS 79 Standard query 0x15ed A www.dnsleaktest.com but wont leak it's subdomain like p3zwu0pq2s.dnsleaktest.com, 9irxt5n4mi.dnsleaktest.com, ...

Τροποποιήθηκε στις από το χρήστη 613038475

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the-edmeister
the-edmeister
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bump

dupe was posted here - https://support.mozilla.org/en-US/questions/989935

613038475
613038475 Ιδιοκτήτης ερώτησης
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Can you open a bug at bugzilla.mozilla.org? I can't create a new account on there. I guest this problem is cause by mozilla replace dns handle in firefox 13 let network.dns.disablePrefetch be an old option no take affect anymore. This is a serious security problem, please fix it as soon as possible.