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

same here,

my 4 relays (guards) all had this log entry, with one of them the log entries are spread over a quarter of an hour (2 tor instances runnnig on this one):

(this one is on Central European time zone, CET)

Nov 2 05:15:22 : Possible compression bomb; abandoning stream.
Nov 2 05:15:23 : message repeated 2 times: [ Possible compression bomb; abandoning stream.]
Nov 2 05:16:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:16:21 : Possible compression bomb; abandoning stream.
Nov 2 05:17:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:17:21 : Possible compression bomb; abandoning stream.
Nov 2 05:19:21 : message repeated 5 times: [ Possible compression bomb; abandoning stream.]
Nov 2 05:19:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:19:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:20:21 : Possible compression bomb; abandoning stream.
Nov 2 05:22:21 : message repeated 4 times: [ Possible compression bomb; abandoning stream.]
Nov 2 05:22:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:22:21 : Possible compression bomb; abandoning stream.
Nov 2 05:23:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:23:21 : Possible compression bomb; abandoning stream.
Nov 2 05:23:21 : Possible compression bomb; abandoning stream.
Nov 2 05:24:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:24:21 : Possible compression bomb; abandoning stream.
Nov 2 05:24:21 : Possible compression bomb; abandoning stream.
Nov 2 05:25:21 : Possible compression bomb; abandoning stream.
Nov 2 05:26:21 : message repeated 3 times: [ Possible compression bomb; abandoning stream.]
Nov 2 05:26:21 : Possible zlib bomb; abandoning stream.
Nov 2 05:26:23 : Possible compression bomb; abandoning stream.
Nov 2 05:27:21 : Possible compression bomb; abandoning stream.
Nov 2 05:29:39 : Possible compression bomb; abandoning stream.
Nov 2 05:29:44 : message repeated 3 times: [ Possible compression bomb; abandoning stream.]

gr. Paul

On Mon, Nov 2, 2020 at 9:28 PM Chris Dagdigian <dag@xxxxxxxxxxxx> wrote:

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

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

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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