Re: [tor-relays] Log warning : possible (zlib) compression bomb on middle relays

Here, too. Between 3 and 12 lines, all within 1-3 seconds. Not totally sure about my arithmetic between time zones, but all seem to be within 5 minutes. Bridge,middle, exits included.

--Torix

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Monday, November 2, 2020 10:05 AM, Guinness guinness@crans.org wrote:

Hi all,

We are at least 3 users running middle relays from 0.4.4.5 and after having some logs like those :

Nov 02 05:30:55.000 [warn] Possible compression bomb; abandoning stream.
Nov 02 05:30:55.000 [warn] Possible zlib bomb; abandoning stream.
Nov 02 05:30:56.000 [warn] Possible compression bomb; abandoning stream.
Nov 02 05:31:00.000 [warn] Possible compression bomb; abandoning stream.
Nov 02 05:31:00.000 [warn] Possible compression bomb; abandoning stream.
Nov 02 05:31:00.000 [warn] Possible compression bomb; abandoning stream.
Nov 02 05:31:55.000 [warn] Possible compression bomb; abandoning stream.
Nov 02 05:31:56.000 [warn] Possible compression bomb; abandoning stream.

I'm wondering if this is an attack or a new feature (haven't checked yet) but I'd like to know how many users are impacted.

The interesting informations are :

• Number of warnings

• What kind of relay it is (middle, exit, entry)

  After your answers, I'll complete the issue I have opened on the bug tracker.

  Cheers,

  Guinness

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