[exim] Re: Exim Zero Day?

Top Page
Delete this message
Reply to this message
Author: Cyborg
Date:  
To: exim-users
Subject: [exim] Re: Exim Zero Day?

Hi,

a short report from our cluster:

Every system has been hit with this "test" :

2023-10-02 04:48:31 SMTP call from (hello) [152.32.233.30] dropped: too
many syntax or protocol errors (last command was "AUTH NTLM
TlRMTVNTUAABAAAAB4IIAAAAAAAAAAAAAAAAAAAAAAA=",  C=EHLO,HELP,AUTH)

"TlRMTVNTUAABAAAAB4IIAAAAAAAAAAAAAAAAAAAAAAA="  decodes to "NTLMSSP"

They try it with and without the base64 string:

2023-10-02 03:45:48 SMTP call from (XXXXXXXXXXX) [152.32.132.194]
dropped: too many syntax or protocol errors (last command was "AUTH
NTLM",  C=EHLO,AUTH)


AUTH NTLM and EXTERNAL are not supported by Exims default config in
Fedora, which leads to the above message if a "no errors allowed" policy
is in place.

"AUTH EXTERNAL" has not been tested and other attempts could not be
identified yet.

best regards,
Marius

--
## subscription configuration (requires account):
## https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/
## unsubscribe (doesn't require an account):
## exim-users-unsubscribe@???
## Exim details at http://www.exim.org/
## Please use the Wiki with this list - http://wiki.exim.org/