jQuery up to 3.3.x Property extend Pollution cross site scripting

Summaryinfo

A vulnerability classified as critical was found in jQuery up to 3.3.x. Affected by this issue is the function extend of the component Property Handler. Executing a manipulation can lead to cross site scripting (Pollution). This vulnerability is tracked as CVE-2019-11358. The attack can be launched remotely. Moreover, an exploit is present. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in jQuery up to 3.3.x (JavaScript Library). It has been declared as critical. This vulnerability affects the function extend of the component Property Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability (Pollution). The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

jQuery before 3.4.0, as used in Drupal, Backdrop CMS, and other products, mishandles jQuery.extend(true, {}, ...) because of Object.prototype pollution. If an unsanitized source object contained an enumerable __proto__ property, it could extend the native Object.prototype.

The weakness was disclosed 04/20/2019 as jQuery 3.4.0 Released (Website). The advisory is available at blog.jquery.com. This vulnerability was named CVE-2019-11358 since 04/19/2019. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details and also a public exploit are known. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

It is possible to download the exploit at vuldb.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 208606 (CentOS 7 : pcs (RHSA-2022:7343)), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277829 (Fedora Security Update for drupal8 (FEDORA-2019-1a3edd7e8a)). The code used by the exploit is:

jQuery.extend(true, {},
  JSON.parse('{"__proto__": {"test": true}}')
);
console.log( "test" in {} ); // true

Upgrading to version 3.4.0 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (52141), Tenable (208606) and SecurityFocus (BID 108023†). The entries VDB-134516, VDB-135155, VDB-135156 and VDB-135157 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• JavaScript Library

Name

• jQuery

Version

• 3.0
• 3.1
• 3.2
• 3.3

License

• open-source

Website

• Product: https://github.com/jquery/jquery/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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