CVE-2021-24888

ImageBoss – Images Up To 60% Smaller & CDN < 3.0.6 - Cross-Site Scripting

2020-05-11 00:00

Strategic Overview

Status: Patched in 3.0.6
Affected Plugin: ImageBoss – Image Optimization & CDN
Affected Version: < 3.0.6
CVSS: 5.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24888

View all ImageBoss – Image Optimization & CDN vulnerabilities

At a glance

CVE-2021-24888 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the ImageBoss WordPress plugin, affecting versions < 3.0.6. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). The issue is fixed in version 3.0.6; sites on affected versions should update now. Disclosed May 2020, reported by Chevon Phillip.

Vulnerability Overview

The ImageBoss WordPress plugin before 3.0.6 does not sanitise and escape its Source Name setting, which could allow high privilege users to perform 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 ImageBoss < 3.0.6 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 ImageBoss the fix is 3.0.6: builds < 3.0.6 are affected, anything from 3.0.6 onward is not.

Remediation

Update to version 3.0.6, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to ImageBoss: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: ImageBoss 3.0.6 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24888 https://www.wordfence.com/threat-intel/vulnerabilities/id/993f6505-918c-45fd-8afa-4d567cc79e9e https://nvd.nist.gov/vuln/detail/CVE-2021-24888

CVSS Vector

5.5

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

Base

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

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