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Comment by runjake

20 hours ago

Little Snitch is probably the most popular one, written my devs who deeply understand macOS firewall architecture.

https://obdev.at/products/littlesnitch/index.html

5 comments

runjake

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ProllyInfamous  20 hours ago

Little Snitch is a user-friendly, software-level blocker, only – use with caution.

Just FYI: LittleSnitch pre-resolves DNS entries BEFORE you click `Accept/Deny`, if you care & understand this potential security issue. Your upstream provider still knows whether you denied a query. Easily verifiable with a PiHole (&c).

I liken the comparison to disk RAIDs: a RAID is not a true backup; LittleSnitch is not a true firewall.

You need isolated hardware for true inbound/outbound protection.

  • gruez  20 hours ago

    >Just FYI: LittleSnitch pre-resolves DNS entries BEFORE you click `Accept/Deny`, if you care & understand this potential security issue. Your upstream provider still knows whether you denied a query. Easily verifiable with a PiHole (&c).

    This also feels like an exfil route? Are DNS queries (no tcp connect) logged/blocked?

    • ProllyInfamous  19 hours ago

      >Are DNS queries blocked?

      No, not with LittleSnitch (neither in/out-bound).

      When you see the LittleSnitch dialogue (asking to `Accept/Deny`), whatever hostname is there has already been pre-resolved by upstream DNS provider (does not matter which option you select). This software pares well with a PiHole (for easy layperson installs), but even then is insufficient for OP's attack.