[UNIX] Happymall E-Commerce Input Validation Flaw Lets Remote Users Execute Arbitrary Commands
From: SecuriTeam (support_at_securiteam.com)
Date: 05/12/03
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To: list@securiteam.com Date: 12 May 2003 13:22:35 +0200
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Happymall E-Commerce Input Validation Flaw Lets Remote Users Execute
Arbitrary Commands
------------------------------------------------------------------------
SUMMARY
Revin Aldi reported an input validation vulnerability in the Happymall
e-commerce software. Two scripts allow remote users to execute arbitrary
commands with the privileges of the web server.
DETAILS
Vulnerable systems:
* Happymall E-Commerce versions 4.3, and 4.4
The 'normal_html.cgi' script does not filter user-supplied input before
making an open() call based on that input. A remote user can create a
specially crafted URL to cause the system to execute arbitrary operating
system commands.
A demonstration exploit is provided:
/shop/normal_html.cgi?file=|id|
/shop/normal_html.cgi? file=;id|
The vendor reports that the 'member_html.cgi' script is also affected.
The following is a timeline of events relevant to this vulnerability:
Apr 26, 2003 Reported to SecurityTracker
Apr 27, 2003 Vendor contacted (via English language e-mail, without
response)
Apr 29, 2003 CERTCC-KR initially contacted
May 2, 2003 Details of vulnerability provided to vendor
May 3, 2003 CERTCC-KR Advisory published
Thanks to Revin Aldi for discovering and reporting the flaw, to CERTCC-KR
for coordinating with the vendor, and to the vendor for quickly
responding.
Impact:
A remote user can execute arbitrary shell commands with the privileges of
the target web server.
Solution:
The vendor has issued a patch, available at:
<http://happymall.happycgi.com/forum/forum_detail.cgi?thread=353>
http://happymall.happycgi.com/forum/forum_detail.cgi?thread=353
The vendor has provided the following instructions for applying the patch
to your system:
1. Extract zip file downloaded and you will get two files, member_html.cgi
and normal_html.cgi.
2. Upload those files with ASCII mode to the web server in the directory
containing index.cgi and overwrite.
3. Change the linked address
For example;
Before patch applied :
http://test6.happycgi.com/normal_html.cgi?file=company.html
After patch applied :
http://test6.happycgi.com/normal_html.cgi?file=company
ADDITIONAL INFORMATION
The vulnerability has been discovered by <mailto:reVn@minangCrew.Web.Ma>
Revin Aldi.
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