CVE-2021-24641

Images to WebP < 1.9 - Cross-Site Request Forgery

2021-10-19 00:00

Strategic Overview

Status: Patched in 1.9
Affected Plugin: Images to WebP
Affected Version: < 1.9
CVSS: 8.1High
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2021-24641

At a glance

CVE-2021-24641 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability in the Images to WebP WordPress plugin, affecting versions < 1.9. It carries a CVSS score of 8.1 (reachable over the network; low attack complexity; high integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.9; sites on affected versions should update now. Disclosed October 2021, reported by apple502j.

Vulnerability Overview

The Images to WebP WordPress plugin before 1.9 does not have CSRF checks in place when performing some administrative actions, which could result in modification of plugin settings, Denial-of-Service, as well as arbitrary image conversion.

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 privileges on the target site. A successful exploit has high impact on integrity, availability.

CWE-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Images to WebP < 1.9 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Images to WebP the fix is 1.9: builds < 1.9 are affected, anything from 1.9 onward is not.

Remediation

Update to version 1.9, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Images to WebP: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Images to WebP 1.9 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24641 https://www.wordfence.com/threat-intel/vulnerabilities/id/a26f4bb7-fe61-4343-82ee-19639c16d978 https://nvd.nist.gov/vuln/detail/CVE-2021-24641

Related records

Other vulnerabilities in Images to WebP

7.5CVE-2021-24644: Images to WebP <= 1.8 Local File InclusionCVE-2021-24644

CVSS Vector

8.1

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh

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