CVE-2019-2391 Explained : Impact and Mitigation

A vulnerability in the js-bson library by MongoDB Inc. could allow incorrect serialization of BSON due to improper parsing of specific JSON input, potentially leading to data disclosure and unexpected application behavior.

Understanding CVE-2019-2391

This CVE involves a flaw in the js-bson library that may result in incorrect serialization of BSON, impacting versions 1.1.3 and earlier.

What is CVE-2019-2391?

The vulnerability arises from the incorrect parsing of certain JSON input, causing js-bson to improperly serialize BSON. This issue affects versions of the js-bson library by MongoDB Inc., specifically versions 1.1.3 and earlier.

The Impact of CVE-2019-2391

The vulnerability could lead to unexpected application behaviors, including data disclosure, due to the incorrect serialization of BSON by js-bson.

Technical Details of CVE-2019-2391

The technical aspects of the CVE include:

Vulnerability Description

CWE-502: Deserialization of Untrusted Data

Affected Systems and Versions

Product: js-bson
Vendor: MongoDB Inc.
Versions Affected: <= 1.1.3

Exploitation Mechanism

Attack Complexity: HIGH
Attack Vector: NETWORK
Privileges Required: LOW
User Interaction: NONE
CVSS Base Score: 4.2 (Medium)

Mitigation and Prevention

To address CVE-2019-2391, consider the following steps:

Immediate Steps to Take

Update to version 1.1.4 of the js-bson library released by MongoDB Inc.
Monitor for any unusual application behavior that may indicate exploitation of the vulnerability.

Long-Term Security Practices

Implement secure coding practices to prevent similar deserialization vulnerabilities.
Regularly update libraries and dependencies to patch known security issues.

Patching and Updates

Apply patches and updates provided by MongoDB Inc. promptly to mitigate the vulnerability.