8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2023-28434

GHSA ID

GHSA-2pxw-r47w-4p8c

EPSS Score

0.96969%

CWE

CWE-269

Published

9/5/2023

Updated

9/5/2023

KEV Status

Yes

Technology

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

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CVE-2023-28434

CVE-2023-28434: Privilege Escalation on Linux/MacOS

Impact

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.

Patches

commit 67f4ba154a27a1b06e48bfabda38355a010dfca5
Author: Aditya Manthramurthy <donatello@users.noreply.github.com>
Date:   Sun Mar 19 21:15:20 2023 -0700

    fix: post policy request security bypass (#16849)

Workarounds

Browser API access must be enabled turning off MINIO_BROWSER=off allows for this workaround.

References

The vulnerable code:

// minio/cmd/generic-handlers.go
func setRequestValidityHandler(h http.Handler) http.Handler {
  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    // ...
    // For all other requests reject access to reserved buckets
    bucketName, _ := request2BucketObjectName(r)
    if isMinioReservedBucket(bucketName) || isMinioMetaBucket(bucketName) {
      if !guessIsRPCReq(r) && !guessIsBrowserReq(r) && !guessIsHealthCheckReq(r) && !guessIsMetricsReq(r) && !isAdminReq(r) && !isKMSReq(r) {
        if ok {
          tc.FuncName = "handler.ValidRequest"
          tc.ResponseRecorder.LogErrBody = true
        }
        writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrAllAccessDisabled), r.URL)
        return
      }
    }
    // ...

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2023-28434

CVE-2023-28434:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

CVE ID

CVE-2023-28434

GHSA ID

GHSA-2pxw-r47w-4p8c

EPSS Score

0.96969%

CWE

CWE-269

Published

9/5/2023

Updated

9/5/2023

KEV Status

Yes

Technology

Basic Information

CVE ID

GHSA ID

EPSS Score

CWE

Published

Updated

KEV Status

Technology

Technical Details

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/minio/minio	go	< 0.0.0-202303200415	0.0.0-202303200415

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stemmed from two key points: 1) The route matcher in api-router.go used a loose regex match for Content-Type rather than proper media type parsing, allowing crafted headers. 2) The isRequestPostPolicySignatureV4 function in auth-handler.go performed an insecure string contains check instead of exact media type validation. Together these allowed attackers to bypass reserved bucket checks by manipulating the Content-Type header while still matching the PostPolicy route requirements.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.W** rul*s *v*il**l* *or Mi**o *ustom*rs only.

Reasoning

*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.*v*il**l* *or Mi**o *ustom*rs only.

8.8

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2023-28434: Privilege Escalation on Linux/MacOS

Impact

Patches

Workarounds

References

CVE-2023-28434:

8.8

-

Basic Information

Basic Information

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Vulnerability IntelligenceMiggo AI

CVE-2023-28434: Privilege Escalation on Linux/MacOS

Impact

Patches

Workarounds

References

8.8

8.8

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

WAF Protection Rules

WAF Rule

Reasoning

Basic Information

Basic Information

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI