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

[Chris Dagdigian]

Same on my US exit relay:

Nov 02 04:03:50.000 [warn] Possible zlib bomb; abandoning stream.
Nov 02 04:03:50.000 [warn] Possible zlib bomb; abandoning stream.




> Christoph Graf <mailto:christoph at links-nett.ch>
> November 2, 2020 at 11:59 AM
>
> Same here on my bridge:
>
> Nov  2 06:21:04 raspipfupf Tor[2556]: Possible zlib bomb; abandoning 
> stream.
> Nov  2 06:21:04 raspipfupf Tor[2556]: Possible zlib bomb; abandoning 
> stream.
>
> Time is UTC+1, nothing before and after
>
> Cheers, Christoph
>
> On 02.11.20 11:05, Guinness wrote:
>
>
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> Guinness <mailto:guinness at crans.org>
> November 2, 2020 at 5:05 AM
> 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,
>
>
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