Mailsploit problem in responce of ENVELOPE

[Aki Tuomi]

This is a good chance to remind people that you can report SECURITY
issues using these methods:

 - https://hackerone.com/dovecot/ (preferred channel)
 - emailing to info at dovecot.fi (or Timo or me directly)

This way we can handle the security issues correctly and safely, and as
a bonus, if you find an actual security issue, we can award you with a
bounty! =)

Aki

On 11.12.2017 05:47, TACHIBANA Masashi wrote:
> Hi,
>
> I'm sorry, I had been tested by miss From/Reply-To,
>
> If From/Reply-To addresses are bellow:
>
>  From: =?utf-8?b?c2VydmljZUBwYXlwYWwuY29tPGlmcmFtZSBvbmxvYWQ9YWxlcnQoZG9jdW1lbnQuY29va2llKSBzcmM9aHR0cHM6Ly93d3cuaHVzaG1haWwuY29tIHN0eWxlPSJkaXNwbGF5Om5vbmUi?==?utf-8?Q?=0A=00?=@mailsploit.com
>  Reply-To: =?utf-8?b?c2VydmljZUBwYXlwYWwuY29tPGlmcmFtZSBvbmxvYWQ9YWxlcnQoZG9jdW1lbnQuY29va2llKSBzcmM9aHR0cHM6Ly93d3cuaHVzaG1haWwuY29tIHN0eWxlPSJkaXNwbGF5Om5vbmUi?==?utf-8?Q?=0A=00?=@mailsploit.com
>
> ENVELOPE will come bellow:
>
> A01 UID FETCH 25 (ENVELOPE)
> * 5 FETCH (UID 25 ENVELOPE ("Fri, 08 Dec 2017 09:44:35 +0900" "test3" ((NIL NIL "=?utf-8?b?c2VydmljZUBwYXlwYWwuY29tPGlmcmFtZSBvbmxvYWQ9YWxlcnQoZG9jdW1lbnQuY29va2llKSBzcmM9aHR0cHM6Ly93d3cuaHVzaG1haWwuY29tIHN0eWxlPSJkaXNwbGF5Om5vbmUi?==?utf-8?Q?=0A=00?=" "mailsploit.com")) (("dev1" NIL "dev1-bounces" "example.com")) ((NIL NIL "=?utf-8?b?c2VydmljZUBwYXlwYWwuY29tPGlmcmFtZSBvbmxvYWQ9YWxlcnQoZG9jdW1lbnQuY29va2llKSBzcmM9aHR0cHM6Ly93d3cuaHVzaG1haWwuY29tIHN0eWxlPSJkaXNwbGF5Om5vbmUi?==?utf-8?Q?=0A=00?=" "mailsploit.com")) (("user1" NIL "user1" "example.com")) (("dev1" NIL "dev1" "example.com")) NIL "<20171206084846.0000478C.0596 at example.com>" "<20171208004435.00006B4F.0014 at example.com>"))
> A01 OK Fetch completed (0.000 secs).
>
> It seems correct response.
>
> Thank you.
>
> ----- Original Message -----
>> Hi,
>>
>> Additionally, I just tried bellow:
>>
>>  From: service at paypal.com<iframe onload=alert(document.cookie) src=https://www.hushmail.com style="display:none"\n\0 at mailsploit.com
>>  Reply-To: service at paypal.com<iframe onload=alert(document.cookie) src=https://www.hushmail.com style="display:none"\n\0 at mailsploit.com
>>
>>
>> Thanks
>>
>>
>> ----- Original Message -----
>>> Hi,
>>>
>>> Sorry, It comes by fetching ENVELOPE, not BODYSTRUCTURE.
>>> For example:
>>>
>>> A01 UID FETCH 24 (ENVELOPE)
>>> * 4 FETCH (UID 24 ENVELOPE ("Fri, 08 Dec 2017 09:44:35 +0900" "test2" ((NIL NIL "service" "paypal.com")) (("dev1" NIL "dev1-bounces" "example.com")) ((NIL NIL "service" "paypal.com")) (("user1" NIL "user1" "example.com")) (("dev1" NIL "dev1" "example.com")) NIL "<20171206084846.0000478C.0596 at example.com>" "<20171208004435.00006B4F.0014 at example.com>"))
>>> A01 OK Fetch completed (0.000 secs).
>>>
>>>> The metasploit generated emails contain a fake Reply-To header.  Are you
>>>> sure that the above isn't the Reply-To header?
>>> I did test also Reply-To header, then had same response as above.
>>>
>>>
>>> ----- Original Message -----
>>>> On Fri, Dec 08, 2017 at 18:47:37 +0900, TACHIBANA Masashi wrote:
>>>>> Hi,
>>>>>
>>>>> I tried to see a mail that have a strange From header in bellow URL:
>>>>>
>>>>> https://www.mailsploit.com/index
>>>>>
>>>>> Then, I got BODYSTRUCTURE response contain next:
>>>>>
>>>>> ((NIL NIL "service" "paypal.com"))
>>>>>
>>>>> Are this problem already founded by anyone?
>>>>> So already fixed?
>>>> The metasploit generated emails contain a fake Reply-To header.  Are you
>>>> sure that the above isn't the Reply-To header?
>>>>
>>>> The "FETCH 123 ENVELOPE" command will return both (and FETCH ALL includes
>>>> ENVELOPE).  From the IMAP RFC:
>>>>
>>>> 	The fields of the envelope structure are in the following order:
>>>> 	date, subject, from, sender, reply-to, to, cc, bcc, in-reply-to, and
>>>> 	message-id.
>>>>
>>>> Can you paste the whole IMAP command response?
>>>>
>>>> Thanks,
>>>>
>>>> Jeff.
>>>>
>>> --
>>> TACHIBANA Masashi  QUALITIA CO., LTD.
>>> mailto:tachibana at qualitia.co.jp
>>>
>>>
>>>
>> --
>> TACHIBANA Masashi  QUALITIA CO., LTD.
>> mailto:tachibana at qualitia.co.jp
>>
>> 株式会社クオリティア
>> http://www.qualitia.co.jp/
>>
>>
>>
> --
> TACHIBANA Masashi  QUALITIA CO., LTD.
> mailto:tachibana at qualitia.co.jp
>
> 株式会社クオリティア
> http://www.qualitia.co.jp/
>
>