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                  Defcom Labs Advisory def-2001-13

                      NTMail Web Services DoS

Author: Peter Gründl <peter.grundldefcom.com>
Release Date: 2001-03-20
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------------------------=[Brief Description]=-------------------------
NTMails web services contain a flaw that could allow a malicious
attacker to crash the web services using a malformed URL.

------------------------=[Affected Systems]=--------------------------
- NTMail V6.0.3c for Windows NT/2000

----------------------=[Detailed Description]=------------------------
It appears that while fixing another URL related problem, Gordano
accidently introduced a new one. The web services on TCP ports 8000
and 9000 are both vulnerable to a "LongURL attack". That means that a
request larger than 255 characters will crash the service.

A crash will take down the services listening on TCP ports:
8000 (NTMail configuration), 8025, 8080, 8888 and 9000 (GLWebMail).

---------------------------=[Workaround]=-----------------------------
Install the patch located at:
ftp://ftp.gordano.com/ntmail6/hotfixes/ntmail6C_Intel_20010317.zip

-------------------------=[Vendor Response]=--------------------------
This issue was brought to the vendor's attention on the 9th of
March, 2001 and a patch was released by the vendor on the 17th
of March 2001.

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