CVE-2021-21390
MinIO AWS Chunked Encoding Signature Bypass MitM Vulnerability
Description
MinIO is an open-source high performance object storage service and it is API compatible with Amazon S3 cloud storage service. In MinIO before version RELEASE.2021-03-17T02-33-02Z, there is a vulnerability which enables MITM modification of request bodies that are meant to have integrity guaranteed by chunk signatures. In a PUT request using aws-chunked encoding, MinIO ordinarily verifies signatures at the end of a chunk. This check can be skipped if the client sends a false chunk size that is much greater than the actual data sent: the server accepts and completes the request without ever reaching the end of the chunk + thereby without ever checking the chunk signature. This is fixed in version RELEASE.2021-03-17T02-33-02Z. As a workaround one can avoid using "aws-chunked" encoding-based chunk signature upload requests instead use TLS. MinIO SDKs automatically disable chunked encoding signature when the server endpoint is configured with TLS.
INFO
Published Date :
March 19, 2021, 4:15 p.m.
Last Modified :
March 25, 2021, 8:29 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-21390.
| URL | Resource |
|---|---|
| https://github.com/minio/minio/commit/e197800f9055489415b53cf137e31e194aaf7ba0 | Exploit Patch Third Party Advisory |
| https://github.com/minio/minio/pull/11801 | Exploit Patch Third Party Advisory |
| https://github.com/minio/minio/security/advisories/GHSA-xr7r-7gpj-5pgp | Exploit Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21390 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21390 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Mar. 25, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://github.com/minio/minio/commit/e197800f9055489415b53cf137e31e194aaf7ba0 No Types Assigned https://github.com/minio/minio/commit/e197800f9055489415b53cf137e31e194aaf7ba0 Exploit, Patch, Third Party Advisory Changed Reference Type https://github.com/minio/minio/pull/11801 No Types Assigned https://github.com/minio/minio/pull/11801 Exploit, Patch, Third Party Advisory Changed Reference Type https://github.com/minio/minio/security/advisories/GHSA-xr7r-7gpj-5pgp No Types Assigned https://github.com/minio/minio/security/advisories/GHSA-xr7r-7gpj-5pgp Exploit, Patch, Third Party Advisory Added CWE NIST CWE-924 Added CPE Configuration OR *cpe:2.3:a:minio:minio:*:*:*:*:*:*:*:* versions up to (excluding) 2021-03-17t02-33-02z
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21390 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-21390
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} -0.00%
score
0.24850
percentile