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CVE-2021-20327— MongoDB Node.js client side field level encryption library may not be validating KMS certificate

Quick assessment

Affected
MongoDB Inc. MongoDB Node.js Driver mongodb-client-encryption module
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Npm mongodb-client-encryption是 Npm开源的一个应用软件。提供客户端字段级加密库可能无法验证KMS证书。 Node.js mongodb-client-encryption 存在安全漏洞，该漏洞源于不执行正确的KMS服务器证书验证。

CVSS 6.4 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1557.002 · ARP Cache Poisoning
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I. Basic Information for CVE-2021-20327

Vulnerability Information
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Vulnerability Title
MongoDB Node.js client side field level encryption library may not be validating KMS certificate
Source: CVE Program / CVE List V5
Vulnerability Description
A specific version of the Node.js mongodb-client-encryption module does not perform correct validation of the KMS server’s certificate. This vulnerability in combination with a privileged network position active MITM attack could result in interception of traffic between the Node.js driver and the KMS service rendering client-side field level encryption (CSFLE) ineffective. This issue was discovered during internal testing and affects mongodb-client-encryption module version 1.2.0, which was available from 2021-Jan-29 and deprecated in the NPM Registry on 2021-Feb-04. This vulnerability does not impact driver traffic payloads with CSFLE-supported key services from applications residing inside the AWS, GCP, and Azure nework fabrics due to compensating controls in these environments. This issue does not impact driver workloads that don’t use Field Level Encryption. This issue affect MongoDB Node.js Driver mongodb-client-encryption module version 1.2.0
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
mongodb-client-encryption 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Npm mongodb-client-encryption是 Npm开源的一个应用软件。提供客户端字段级加密库可能无法验证KMS证书。 Node.js mongodb-client-encryption 存在安全漏洞，该漏洞源于不执行正确的KMS服务器证书验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB Inc. MongoDB Node.js Driver mongodb-client-encryption module 1.2.0 -

II. Public POCs for CVE-2021-20327

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III. Intelligence Information for CVE-2021-20327

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Other References for CVE-2021-20327 (1)

IV. Related Vulnerabilities

Same vendor: MongoDB Inc.
Same weakness: CWE-295

V. Comments for CVE-2021-20327

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