Freemius SDK <= 2.5.9 - Reflected Cross-Site Scripting via fs_request_get
Strategic Overview
- Status
- Patched in 20200610
- Affected Plugin
- DeMomentSomTres WordPress Export Posts With Images
- Affected Version
<= 2.5- CVSS
- 6.1Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2023-33999
At a glance
CVE-2023-33999 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the DeMomentSomTres WordPress Export Posts With Images WordPress plugin, affecting versions <= 2.5. 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 20200610; sites on affected versions should update now. Disclosed July 2023, reported by Rafie Muhammad.
Vulnerability Overview
The Freemius SDK for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘fs_request_get’ function in versions up to, and including, 2.5.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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')
DeMomentSomTres WordPress Export Posts With Images <= 2.5 carries this weakness at fs_request_get, 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 DeMomentSomTres WordPress Export Posts With Images the fix is 20200610: builds <= 2.5 are affected, anything from 20200610 onward is not.
Remediation
Update to version 20200610, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to DeMomentSomTres WordPress Export Posts With Images: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: DeMomentSomTres WordPress Export Posts With Images 20200610 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in DeMomentSomTres WordPress Export Posts With Images
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