CVE-2021-24126

Envira Gallery Lite <= 1.8.3.2 - Cross-Site Scripting

2020-12-19 00:00
minhtuanact

Strategic Overview

Status
Patched in 1.8.3.3
Affected Plugin
Envira Gallery – Image Photo Gallery, Albums, Video Gallery, Slideshows & More
Affected Version
< 1.8.3.3
CVSS
5.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-24126
View all Envira Gallery – Image Photo Gallery, Albums, Video Gallery, Slideshows & More vulnerabilities

At a glance

CVE-2021-24126 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Envira Gallery WordPress plugin, affecting versions < 1.8.3.3. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). The issue is fixed in version 1.8.3.3; sites on affected versions should update now. Disclosed December 2020, reported by minhtuanact.

Vulnerability Overview

Unvalidated input and lack of output encoding in the Envira Gallery Lite WordPress plugin, versions before 1.8.3.3, did not properly sanitise the images metadata (namely title) before outputting them in the generated gallery, which could lead to privilege escalation.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.

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

Reaching this weakness in Envira Gallery < 1.8.3.3 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 Envira Gallery the fix is 1.8.3.3: builds < 1.8.3.3 are affected, anything from 1.8.3.3 onward is not.

Remediation

Update to version 1.8.3.3, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Envira Gallery: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Envira Gallery 1.8.3.3 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24126https://www.wordfence.com/threat-intel/vulnerabilities/id/98361cfd-1277-43fd-b0da-db2549628383https://nvd.nist.gov/vuln/detail/CVE-2021-24126

Related records

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