Servers.co.nz Security Advisory SCN200409-1
Available in HTML format at
http://www.servers.co.nz/security/SCN200409-1.php
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SQL Injection vulnerability in bBlog 0.7.3
Author: James McGlinn, Servers.co.nz Ltd <james_at_servers dot co dot
nz>
Discovery Date: September 28, 2004
Package: bBlog
Versions Affected: 0.7.2, 0.7.3
Severity: Severe - a remote user can gain administrative privileges.
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Problem: There is an SQL Injection vulnerability in versions of bBlog
prior to 0.7.3, which can be exploited to gain administrative access if
register_globals is enabled on the web server.
Introduction: bBlog is a blogging system written in PHP and released
under the GPL. It is used by thousands of bloggers worldwide and has
features not found on other blogging systems including advanced comment
spam prevention and threaded comments.
Discussion: The array $p is not initialised before being populated and
passed to $bBlog->make_post_query() on line 30 of rss.php. In an
environment where register_globals is enabled, $p can be introduced to
the script with unfiltered elements from user input.
Using a specially crafted URL, POST data or cookie a remote user can
gain access to the admin user's access credentials. Exploit withheld at
project maintainer's request.
Solution: This issue is fixed as of version 0.7.4. A patch for rss.php
of version 0.7.3 is available at the URL below:
http://www.servers.co.nz/security/patches/SCN200409-1/rss.php-patch.txt
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ABOUT SERVERS.CO.NZ LTD
Servers.co.nz are leaders in the design, implementation & auditing of
effective online information systems for SMEs.
Phone: (NZ) 0800 4 SERVERS
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James McGlinn
Project Manager
BCom, BSc, Zend Certified Engineer (PHP)
Servers.co.nz Ltd
68 Shortland St, Auckland PO Box 3688 Shortland St, Auckland, New
Zealand
Phone: 0800 4 SERVERS Fax: +64 9 358 5187
Received on Oct 01 2004
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