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WooCommerce has a Cross-Site Scripting (XSS) Vulnerability in checkout & registration forms

Moderate severity GitHub Reviewed Published Jun 12, 2024 in woocommerce/woocommerce • Updated Jul 24, 2024

Package

composer woocommerce/woocommerce (Composer)

Affected versions

>= 8.8.0, < 8.8.5
>= 8.9.0, < 8.9.3

Patched versions

8.8.5
8.9.3

Description

Impact

A vulnerability introduced in WooCommerce 8.8 allows for cross-site scripting. A bad actor can manipulate a link to include malicious HTML & JavaScript content. While the content is not saved to the database, the links may be sent to victims for malicious purposes. The injected JavaScript could hijack content & data stored in the browser, including the session.
The URL content is read through the Sourcebuster.js library and then inserted without proper sanitization to the classic checkout and registration forms.

Patches

diff --git a/plugins/woocommerce/client/legacy/js/frontend/order-attribution.js b/plugins/woocommerce/client/legacy/js/frontend/order-attribution.js
index 79411e928e1..25eaa721c54 100644
--- a/plugins/woocommerce/client/legacy/js/frontend/order-attribution.js
+++ b/plugins/woocommerce/client/legacy/js/frontend/order-attribution.js
@@ -155,12 +155,16 @@
 		 * but it's not yet supported in Safari.
 		 */
 		connectedCallback() {
-			let inputs = '';
+			this.innerHTML = '';
+			const inputs = new DocumentFragment();
 			for( const fieldName of this._fieldNames ) {
-				const value = stringifyFalsyInputValue( this.values[ fieldName ] );
-				inputs += `<input type="hidden" name="${params.prefix}${fieldName}" value="${value}"/>`;
+				const input = document.createElement( 'input' );
+				input.type = 'hidden';
+				input.name = `${params.prefix}${fieldName}`;
+				input.value = stringifyFalsyInputValue( ( this.values && this.values[ fieldName ] ) || '' );
+				inputs.appendChild( input );
 			}
-			this.innerHTML = inputs;
+			this.appendChild( inputs );
 		}
 
 		/**

Workarounds

Disabling the Order Attribution feature

References

A8C SIRT: p3btAN-2L2-p2 (internal)
Public disclosure: https://developer.woocommerce.com/2024/06/10/developer-advisory-xss-vulnerability-8-8-0/

References

@tomalec tomalec published to woocommerce/woocommerce Jun 12, 2024
Published by the National Vulnerability Database Jun 12, 2024
Published to the GitHub Advisory Database Jun 12, 2024
Reviewed Jun 12, 2024
Last updated Jul 24, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.089%
(39th percentile)

CVE ID

CVE-2024-37297

GHSA ID

GHSA-cv23-q6gh-xfrf
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