CVE-2021-24667

Gallery Blocks with Lightbox <= 2.2.0 - Authenticated Stored Cross-Site Scripting

2021-08-23 00:00
Vishnupriya Ilango

Strategic Overview

Status
Patched in 2.2.1
Affected Plugin
SimpLy Gallery
Affected Version
< 2.2.1
CVSS
5.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-24667
View all SimpLy Gallery vulnerabilities

At a glance

CVE-2021-24667 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the SimpLy Gallery WordPress plugin, affecting versions < 2.2.1. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 2.2.1; sites on affected versions should update now. Disclosed August 2021, reported by Vishnupriya Ilango.

Vulnerability Overview

A stored cross-site scripting vulnerability has been discovered in : Simply Gallery Blocks with Lightbox (Version – 2.2.0 & below). The vulnerability exists in the Lightbox functionality where a user with low privileges is allowed to execute arbitrary script code within the context of the application. This vulnerability is due to insufficient validation of image parameters in meta data.

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 SimpLy Gallery < 2.2.1 takes any authenticated account. 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 SimpLy Gallery the fix is 2.2.1: builds < 2.2.1 are affected, anything from 2.2.1 onward is not.

Remediation

Update to version 2.2.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to SimpLy Gallery: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: SimpLy Gallery 2.2.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24667https://www.wordfence.com/threat-intel/vulnerabilities/id/5de488a2-72d6-4eeb-9b92-7f5bea1ee4ffhttps://nvd.nist.gov/vuln/detail/CVE-2021-24667

Related records

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