cbcvebase.
CVE-2021-43858
published 2021-12-27

CVE-2021-43858: MinIO is a Kubernetes native application for cloud storage. Prior to version `RELEASE.2021-12-27T07-23-18Z`, a malicious client can hand-craft an HTTP API call…

PriorityP268high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
35.46%
98.2th percentile
MinIO is a Kubernetes native application for cloud storage. Prior to version `RELEASE.2021-12-27T07-23-18Z`, a malicious client can hand-craft an HTTP API call that allows for updating policy for a user and gaining higher privileges. The patch in version `RELEASE.2021-12-27T07-23-18Z` changes the accepted request body type and removes the ability to apply policy changes through this API. There is a workaround for this vulnerability: Changing passwords can be disabled by adding an explicit `Deny` rule to disable the API for users.

Affected

2 ranges
VendorProductVersion rangeFixed in
miniominio< RELEASE.2021-12-27T07-23-18ZRELEASE.2021-12-27T07-23-18Z
miniominio< 2021-12-27t07-23-18z2021-12-27t07-23-18z

Detection & IOCsextracted from sources · hover to see the quote

  • →The vulnerability is exploited via a hand-crafted HTTP API call to the MinIO AddUser() admin API that includes a policy field in the request body, allowing privilege escalation. Monitor for unexpected policy update requests via the AddUser admin API endpoint. ↗
  • →MinIO versions prior to RELEASE.2021-12-27T07-23-18Z are vulnerable. Detect unpatched MinIO instances by version fingerprinting. ↗
  • ·Workaround: Disable the password-change/AddUser API for users by adding an explicit Deny policy rule. This prevents exploitation even on unpatched versions. ↗
  • ·The patch changes the accepted request body type for the AddUser admin API and removes the ability to apply policy changes through this API. Verify patched deployments are running RELEASE.2021-12-27T07-23-18Z or later. ↗

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.06.5MEDIUMAV:N/AC:L/Au:S/C:P/I:P/A:P
vendor_redhat8.8HIGH
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