CVE-2021-24882

Slideshow Gallery < 1.7.4 - Cross-Site Scripting

2021-10-25 00:00

Strategic Overview

Status: Patched in 1.7.4
Affected Plugin: Slideshow Gallery LITE
Affected Version: < 1.7.4
CVSS: 4.8Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24882

View all Slideshow Gallery LITE vulnerabilities

At a glance

CVE-2021-24882 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Slideshow Gallery LITE WordPress plugin, affecting versions < 1.7.4. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). The issue is fixed in version 1.7.4; sites on affected versions should update now. Disclosed October 2021, reported by Tyler Miller.

Vulnerability Overview

The Slideshow Gallery WordPress plugin before 1.7.4 does not sanitise and escape the Slide "Title", "Description", and Gallery "Title" fields, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed

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')

Slideshow Gallery LITE < 1.7.4 carries this weakness at Title, 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 Slideshow Gallery LITE the fix is 1.7.4: builds < 1.7.4 are affected, anything from 1.7.4 onward is not.

Remediation

Update to version 1.7.4, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Slideshow Gallery LITE: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Slideshow Gallery LITE 1.7.4 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24882 https://www.wordfence.com/threat-intel/vulnerabilities/id/a1eec01c-7f54-4e90-a943-c50b8ab79b22 https://nvd.nist.gov/vuln/detail/CVE-2021-24882

Related records

Same weakness class

CVSS Vector

4.8

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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