Code Injection in Epicor Retail Store 3.2.03.01.008

[webmaster@xxxxxxxxxxxxxx]

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Title: Code Injection in Epicor Retail Store Help System
CVE: CVE-2015-2210
Vendor: Epicor
Product: CRS Retail Store v3.2.03.01.008 
Affected version: 3.2.03.01.008
Reported by: Zeng Xianbo Joseph (webmaster@xxxxxxxxxxxxxx)
Issue identified by: Zeng Xianbo Joseph and Alshi Shantanu 

OVERVIEW
By design, the POS software requires a higher privileged user (e.g. remote 
supervisor) to authorize running system commands on the operating system. These 
include shutting down the system, launching task manager or running arbitrary 
system commands. An authorized user must successfully provide the correct 
response code to a challenge code presented by the CRS RetailStore software. 
This can be bypassed by exploiting the vulnerability identified below.
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STEPS TO IDENTIFY VULNERABILITY

- From the POS main screen,
1. Click F1 Help button
2.      Click F5 Void Last Item
3.      Right click on Help window
4.      Click View Source
5.      Insert some JavaScript into the HTML file which creates a button to 
spawn a command shell
6.      Save file
7.      Right click on Help window
8.      Click Refresh
9.      Click the newly created button that will spawn a shell
10. If a prompt appears asking for permissions to run ActiveX, click ?Yes?

During the test, the system was observed to run the Windows command prompt on 
Windows XP Embedded. This was performed using an ActiveX JavaScript payload.
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RECOMMENDED ACTIONS
For systems which are using the affected software, the following actions are 
advised:
* Upgrade affected systems to the latest stable version of CRS Retail Store
* Consider upgrading Windows operating systems to later stable versions such as 
Windows Embedded 8.1 Industry
* Ensure proper network segmentation and firewalls are configured and placed 
correctly for networks containing such systems
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TIMELINE
All times provided in GMT +8
2014 July: Security issue found on CRS Retail Store software. Issue reported to 
vendor for fix through Epicor client. April 2015 given as date for completion 
of patch deployment.
2015 Feb 17: Email sent to asiamarketing@xxxxxxxxxx to confirm that the 
vulnerability had been fixed. There was no reply.
2015 Feb 28: Email sent to asiamarketing@xxxxxxxxxx for update on earlier 
email. There was no reply.
2015 Mar 4:  Request sent to CVE assignment team, MITRE CVE Numbering Authority 
for CVE identifier
2015 Mar 5:  CVE-2015-2210 is assigned by CVE assignment team, MITRE CVE 
Numbering Authority
2015 Mar 18: Call made to Epicor Corporate HQ (+15123282300) at 10:01:39 PM. 
Recipient of call did not seem to understand about security issue.
2015 Mar 21: Issue reported to CERT(R) Coordination Center. Issue tagged as 
VU#255588.
                        CERT Vulnerability Analysis Team declines to publish 
issue due to local exploitation and advises that 
                        "if the vendor is unresponsive, publishing via 
SecurityFocus or another mailing list after some time (we recommend allowing 45 
days for a vendor response) is an option."
2015 May 2:  Security advisory released for the purpose of preventing such 
attacks by notifying public of need to mitigate vulnerability.
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SEVERITY RATING
CVSS v2 Score:  5.3 (AV:L/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:OF/RC:C)
CVSS v3 Preview 2 Score: 6.7 
(CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C)
Official patch assumed for this calculation.
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