Stockdio Historical Chart < 2.8.1 - Reflected Cross-Site Scripting
Strategic Overview
- Status
- Patched in 2.8.1
- Affected Plugin
- Stockdio Historical Chart
- Affected Version
< 2.8.1- CVSS
- 6.1Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2020-28707
At a glance
CVE-2020-28707 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Stockdio Historical Chart WordPress plugin, affecting versions < 2.8.1. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.8.1; sites on affected versions should update now. Disclosed October 2020, reported by jondow.
Vulnerability Overview
The Stockdio Historical Chart plugin before 2.8.1 for WordPress is affected by Cross Site Scripting (XSS) via stockdio_chart_historical-wp.js in wp-content/plugins/stockdio-historical-chart/assets/ because the origin of a postMessage() event is not validated. The stockdio_eventer function listens for any postMessage event. After a message event is sent to the application, this function sets the "e" variable as the event and checks that the types of the data and data.method are not undefined (empty) before proceeding to eval the data.method received from the postMessage. However, on a different website. JavaScript code can call window.open for the vulnerable WordPress instance and do a postMessage(msg,'*') for that object.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Stockdio Historical Chart < 2.8.1 carries this weakness at postMessage(), and reaching it takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Stockdio Historical Chart the fix is 2.8.1: builds < 2.8.1 are affected, anything from 2.8.1 onward is not.
Remediation
Update to version 2.8.1, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Stockdio Historical Chart: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Stockdio Historical Chart 2.8.1 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
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