CVE-2021-20327 MongoDB Node.js client side field level encryption library may not be validating KMS certificate
An attacker with privileged network position can intercept traffic and bypass client-side field level encryption due to missing KMS certificate validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-20327?
CVE-2021-20327 is a medium-severity vulnerability in MongoDB Node.js Driver mongodb-client-encryption module, published on 25 Feb 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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
Weakness: CWE-295
Which versions are affected by CVE-2021-20327?
2 open source packages ship an affected version, including mongodb-client-encryption. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb-client-encryption npm | From 1.2.0 | 1.2.1 |
mongodb-client-encryption npm | From 1.2.0 | 1.2.1 |
Products include Mongodb Mongodb Client Encryption.
How do I fix CVE-2021-20327?
Upgrade mongodb-client-encryption to 1.2.1 or later.
Is CVE-2021-20327 being exploited?
There is no known exploitation of CVE-2021-20327 in the wild and no public exploit code.
Sources
Also known as GHSA-rjmf-p882-645m.