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Joined 1 year ago
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Cake day: July 9th, 2023

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  • The very next sentence:

    Note that everything that is not Linux has been filtered out [in this filtered list of unique IPs]. That is why I was getting increasingly alarmed during the last few weeks.

    They said they were getting duplicates and non-*nix hits with that 300k number, which doesn’t help them (i.e. the hundreds of thousands of hits was artificially inflated). So yes, the threat is overblown.

    Coupled with the fact that patches are already out, and it’s easily mitigated by closing 631, and I don’t expect this will be much of a problem for most people.








    • To exploit this across the internet or LAN, a miscreant needs to reach your CUPS service on UDP port 631. Hopefully none of you have that facing the public internet. The miscreant also has to wait for you to start a print job.
    • If port 631 isn’t directly reachable, an attacker may be able to spoof zeroconf, mDNS, or DNS-SD advertisements to achieve exploitation on a LAN. Details of that path will be disclosed later, we’re promised.

    So don’t expose 631 to the internet (why would you?) and know who’s on your network. Be careful printing things on an untrusted network.

    It’s serious, but seems like a wonky attack vector for most.