MinIO is vulnerable to privilege escalation on Linux/MacOS
Affects MinIO on Linux and macOS when Console API access is enabled and a credential holds arn:aws:s3:::* permission. Fixed in RELEASE.2023-03-20T20-16-18Z.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in RELEASE.2023-03-20T20-16-18Z, 0.0.0-202303200415
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
MinIO, a multi-cloud object storage framework used on Linux and macOS, is affected by this vulnerability. An attacker with valid credentials that have broad S3 bucket permissions and Console API access could use crafted requests to write objects into buckets they should not have access to, bypassing bucket name checks.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
Minio is a Multi-Cloud Object Storage framework. Prior to RELEASE.2023-03-20T20-16-18Z, an attacker can use crafted requests to bypass metadata bucket name checking and put an object into any bucket while processing `PostPolicyBucket`. To carry out this attack, the attacker requires credentials with `arn:aws:s3:::*` permission, as well as enabled Console API access. This issue has been patched in RELEASE.2023-03-20T20-16-18Z. As a workaround, enable browser API access and turn off `MINIO_BROWSER=off`.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
Affected versions
- minio minio
fixed in RELEASE.2023-03-20T20-16-18Z
- github.com/minio/minioGo
fixed in 0.0.0-202303200415
References 3
GitHub · minio/minio
Questions about CVE-2023-28434
What does this mean?
A credential with arn:aws:s3:::* permission can bypass the metadata bucket name checks and write an object into any bucket, including reserved system buckets. That write can lead to privilege escalation.Source: github.com
Am I affected, and how do I check?
Affected are MinIO builds older than RELEASE.2023-03-20T20-16-18Z, and Go module builds older than 0.0.0-202303200415. The bug needs Console API access enabled and a credential with arn:aws:s3:::* permission. To check a setup, compare the release timestamp shown by the MinIO version command with the fixed release, and check whether Console API access is enabled.Source: github.com
What should I do about it?
Upgrade MinIO to RELEASE.2023-03-20T20-16-18Z or later. The advisory's workaround is to keep Browser API access on and set MINIO_BROWSER=off.Source: github.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2023-09-19, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data