CVE-2021-39350

FV Flowplayer Video Player 7.5.0.727 - 7.5.2.727 - Reflected Cross-Site Scripting via player_id Parameter

2021-10-05 20:14
Margaux DABERT

Strategic Overview

Status
Patched in 7.5.3.727
Affected Plugin
FV Flowplayer Video Player
Affected Version
7.5.0.727 – 7.5.2.727
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-39350
View all FV Flowplayer Video Player vulnerabilities

At a glance

CVE-2021-39350 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the FV Flowplayer Video Player WordPress plugin, affecting versions 7.5.0.727 – 7.5.2.727. 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 7.5.3.727; sites on affected versions should update now. Disclosed October 2021, reported by Margaux DABERT.

Vulnerability Overview

The FV Flowplayer Video Player WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the player_id parameter found in the ~/view/stats.php file which allows attackers to inject arbitrary web scripts, in versions 7.5.0.727 - 7.5.2.727.

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')

Reaching this weakness in FV Flowplayer Video Player 7.5.0.727 – 7.5.2.727 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 FV Flowplayer Video Player the fix is 7.5.3.727: builds 7.5.0.727 – 7.5.2.727 are affected, anything from 7.5.3.727 onward is not.

Remediation

Update to version 7.5.3.727, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to FV Flowplayer Video Player: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: FV Flowplayer Video Player 7.5.3.727 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-39350https://www.wordfence.com/threat-intel/vulnerabilities/id/7b795352-fad8-485e-bd1b-68c0913555e2https://nvd.nist.gov/vuln/detail/CVE-2021-39350

Related records

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