Home / exploits Epicor Retail Store Help System 3.2.03.01.008 Code Execution
Posted on 05 May 2015
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 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@josephzeng.com) 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. _______________________________________________________________________ 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. _______________________________________________________________________ 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 _______________________________________________________________________ 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@epicor.com to confirm that the vulnerability had been fixed. There was no reply. 2015 Feb 28: Email sent to asiamarketing@epicor.com 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. _______________________________________________________________________ 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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJVRG4rAAoJEC7dR+igIW6k/HYH/R7QJKw5ycI8dHeWco3I6Bew ZN+cyv/a2sLNAgGCAJHkCsDd5moK6t7ZJMbGlKLp06B/95Ya4bkctZESzRUo2qwk NRiwy8SjypIvR/S5cqfHNN4SVKGYac+3T7vcSrgBT6HQ5fqJihEGwe6sfJJyTlON ksfwjX8/xt0823wP8+3nhcNyScYtmkKMNzmy9uwZzSUPgKNDoGgMQtAmyCMSKcj6 JwWytUylfebHozisG+X4hWGqGf7zGQVw4pCwD2o3Bo4db5MHhmYqL8guSYPjRF6a As8nu4gW88w5YGBvdLzgkFLsMUQ3FUhTQqD5zC7Hx0aLuPjys2lFzXVhD7Jdi28= =dHZo -----END PGP SIGNATURE-----
