CVE-2021-24732

PDF Flipbook, 3D Flipbook WordPress – DearFlip Lite <= 1.7.12 - Contributor+ Stored Cross-Site Scripting

2021-09-15 00:00
apple502j

Strategic Overview

Status
Patched in 1.7.13
Affected Plugin
DearFlip – PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer
Affected Version
<= 1.7.12
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-24732
View all DearFlip – PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer vulnerabilities

At a glance

CVE-2021-24732 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the DearFlip WordPress plugin, affecting versions <= 1.7.12. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 1.7.13; sites on affected versions should update now. Disclosed September 2021, reported by apple502j.

Vulnerability Overview

The PDF Flipbook, 3D Flipbook WordPress – DearFlip WordPress plugin before 1.7.13 does not escape the class attribute of its shortcode before outputting it back in an attribute, which could allow users with a role as low as Contributor to perform Stored Cross-Site Scripting attacks

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 interaction from a victim user.

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

Reaching this weakness in DearFlip <= 1.7.12 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 DearFlip the fix is 1.7.13: builds <= 1.7.12 are affected, anything from 1.7.13 onward is not.

Remediation

Update to version 1.7.13, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to DearFlip: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: DearFlip 1.7.13 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24732https://www.wordfence.com/threat-intel/vulnerabilities/id/efb692da-6878-420a-b16e-2cb871bef764https://nvd.nist.gov/vuln/detail/CVE-2021-24732

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C