Adobe Magento Commerce Cross Site Scripting

2021.02.11
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 3.5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 6.8/10
Exploit range: Remote
Attack complexity: Medium
Authentication: Single time
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

SEC Consult Vulnerability Lab Security Advisory < 20210210-0 > ======================================================================= title: Reflected Cross-Site Scripting (XSS) product: Adobe Magento Commerce vulnerable version: < 2.4.2 fixed version: 2.4.2 CVE number: CVE-2021-21029 impact: Medium homepage: https://magento.com/ found: 2020-06-29 by: Natsasit Jirathammanuwat (Office Thailand) SEC Consult Vulnerability Lab An integrated part of SEC Consult, an Atos company Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Magento Commerce, offers a one-of-a-kind eCommerce solution with enterprise power, unlimited scalability, and open-source flexibility for B2C and B2B experiences. Magento allows you to create unique, full-lifecycle customer experiences proven to generate more sales. No matter what your company’s size or goals — omnichannel, global expansion, mobile — Magento delivers everything you need for growth in an increasingly competitive market." Source: https://magento.com/products Business recommendation: ------------------------ Update to the latest version of Adobe Magento Commerce. An in-depth security analysis performed by security professionals is highly advised, as the software may be affected from further security issues. Vulnerability overview/description: ----------------------------------- 1) Reflected Cross-Site Scripting (XSS) (CVE-2021-21029) This vulnerability allows an unauthenticated user to inject malicious client side script into the URL and send to the victim. The browser may redirect the victim (e.g. admin) to the frontend page when visiting the URL, the script will be executed after the victim visits the admin panel again. This vulnerability has two different scenarios: 1. Security configuration "Add Secret Key to URLs" is enabled (default). - Admin panel path is required. - Key value (secret hash) in the URL is required. - User interaction is required (navigate back to the admin panel). 2. Security configuration "Add Secret Key to URLs" is disabled. - Admin panel path is required. - User interaction is required (navigate back to the admin panel). Proof of concept: ----------------- 1) Reflected Cross-Site Scripting (XSS) (CVE-2021-21029) The "file" parameter is vulnerable to reflected cross-site scripting vulnerability. By sending the XSS payload in the Base64 encoded format in the URL as follows: 1. Security configuration "Add Secret Key to URLs" is enabled (default). URL format: https://{baseURL}/{adminPath}/admin/system_design_theme/downloadCss/theme_id/{themeID}/file/{base64encoded_xss_payload}/key/{secret_hash} Example URL: https://127.0.0.1/index.php/admin/admin/system_design_theme/downloadCss/theme_id/1/file/PHNjcmlwdD5hbGVydCgnWFNTIGJ5IFNFQyBDb25zdWx0Jyk8L3NjcmlwdD4%3D/key/0f5d20e8559bb6f45e4840ceb6231870f3a8fe122698b37c32ceabbb33595813 2. Security configuration "Add Secret Key to URLs" is disabled. URL format: https://{baseURL}/{adminPath}/admin/system_design_theme/downloadCss/theme_id/{themeID}/file/{base64encoded_xss_payload}/ Example URL: https://127.0.0.1/index.php/admin/admin/system_design_theme/downloadCss/theme_id/1/file/PHNjcmlwdD5hbGVydCgnWFNTIGJ5IFNFQyBDb25zdWx0Jyk8L3NjcmlwdD4%3D/ Vulnerable / tested versions: ----------------------------- Magento2 version 2.3.5-p1 has been tested, which was the latest version available at the time of the test. Previous versions may also be affected. Later versions until the patched version v2.4.2 are affected as well. Vendor contact timeline: ------------------------ 2020-07-09 | Contacting vendor through https://hackerone.com/magento. 2020-07-09 | The report is flagged as out-of-scope in hackerone. 2020-08-13 | Contacting vendor and requesting encryption key through psirt@adobe.com. 2020-08-13 | Vendor provides PGP encryption key. 2020-08-14 | Sending encrypted advisory to the vendor. 2020-09-09 | Asking vendor for a status update. 2020-09-10 | Vendor is still investigating the issue. 2020-09-28 | Asking vendor for a status update. 2020-10-02 | Vendor is still investigating the issue. 2020-11-24 | Asking vendor for a status update. 2020-11-24 | Vendor is planing to fix the issue in next release. 2021-02-02 | Asking vendor for a status update and the release date. 2021-02-02 | Vendor is planing to release a security update on February 9th. 2021-02-10 | Coordinated release of security advisory. Solution: --------- Update to the latest available version v2.4.2 of Magento2 from the vendor's download page: https://magento.com/tech-resources/download Vendor security advisory: https://helpx.adobe.com/security/products/magento/apsb21-08.html Workaround: ----------- None Advisory URL: ------------- https://sec-consult.com/vulnerability-lab/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult, an Atos company Europe | Asia | North America About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult, an Atos company. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://sec-consult.com/career/ Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://sec-consult.com/contact/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF N. Jirathammanuwat / @2021


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