FV Flowplayer Video Player <= 6.0.3.3 - Stored Cross-Site Scripting

2015-08-24 00:00

Strategic Overview

Status: Patched in 6.0.3.4
Affected Plugin: FV Flowplayer Video Player
Affected Version: <= 6.0.3.3
CVSS: 5.3Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE pending

View all FV Flowplayer Video Player vulnerabilities

At a glance

This record tracks 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 <= 6.0.3.3. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 6.0.3.4; sites on affected versions should update now. Disclosed August 2015, reported by Marcin Probola.

Vulnerability Overview

The FV Flowplayer Video Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘page’ parameter in versions up to, and including, 6.0.3.3 due to insufficient input sanitization and output escaping. This makes it possible for attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

FV Flowplayer Video Player <= 6.0.3.3 carries this weakness at page, 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 FV Flowplayer Video Player the fix is 6.0.3.4: builds <= 6.0.3.3 are affected, anything from 6.0.3.4 onward is not.

Remediation

Update to version 6.0.3.4, 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 6.0.3.4 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/b3325317-4ce7-468d-aee7-9b40fdf61d3c

Related records

Same weakness class

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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