jQuery up to 3.3.x Property extend privilege escalation

A vulnerability was found in jQuery up to 3.3.x (Software Library) and classified as critical. Affected by this issue is the function extend of the component Property Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability (Prototype). Using CWE to declare the problem leads to CWE-269. Impacted is confidentiality, integrity, and availability.

The weakness was published 04/10/2019 as jQuery 3.4.0 Released (Website). The advisory is available at blog.jquery.com. This vulnerability is handled as CVE-2019-5428 since 01/04/2019. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known.

It is declared as proof-of-concept. The exploit is available at vuldb.com. 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 immediately after the disclosure of the vulnerability.

Name

• jQuery

• ?

• ?

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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VulDB Reliability: ?

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Class: Privilege escalation / Prototype (CWE-269)
Local: No
Remote: Yes

Availability: ?
Access: Public
Status: Proof-of-Concept
Download: ?

Price Prediction: ?
Current Price Estimation: ?

Threat Intelligenceinfoedit

Threat: ?
Adversaries: ?
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Remediation: ?Recommended: Upgrade
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Upgrade: jQuery 3.4.0

01/04/2019 CVE assigned
04/10/2019 +96 days Advisory disclosed
04/10/2019 +0 days Countermeasure disclosed
04/23/2019 +13 days VulDB entry created
04/23/2019 +0 days VulDB last updateAdvisory: jQuery 3.4.0 Released
Status: Confirmed

CVE: CVE-2019-5428 (?)

Created: 04/23/2019 09:09 AM
Complete: ?

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