high8.8Known exploited

CVE-2023-28434

Privilege Escalation on Linux/MacOS

Exploited in the wild

This vulnerability is on a Known Exploited Vulnerabilities catalogue, added 2023-09-19. Federal due date: 2023-10-10.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Impact

### 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: ```go // 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 } } // ... ```

Affected packages

Ecosystem	Package	Affected	Fixed in
go	`github.com/minio/minio`	< 0.0.0-202303200415	0.0.0-202303200415

Affected products

Vendor	Product	Affected versions
Minio	Minio	before 2023-03-20t20-16-18z

Weakness classification

CWE-269