Описание
oras-go blob upload vulnerable to credential forwarding via unvalidated Location header
Summary
oras-go follows a registry-controlled Location header during the monolithic blob upload flow and reuses the Authorization header from the initial POST request for the subsequent PUT request. If a malicious registry returns a cross-host Location, oras-go can send the caller's credentials to an attacker-controlled endpoint.
Affected Versions
tested: v2.6.0 (commit 03243809936cce826494b5506f724c6dc11115b1, as-of 2026-01-24) range: unknown; likely affects earlier v2.x releases that include the same upload flow
Impact
Credential leak to an attacker-controlled endpoint and client-side ssrf to a cross-host target.
Affected Component
registry/remote/repository.go:878-916(blobStore.completePushAfterInitialPost)
Reproduction
Attachments include poc.zip with a local-only harness (no real registry required). It runs a fake registry server that returns a cross-host Location and a second server that records whether it received Authorization.
Recommended Fix
- validate
Locationbefore uploading (scheme + hostname + effective port) against the original request, or require an explicit opt-in allowlist for cross-host upload urls - never forward
Authorizationwhen the upload target changes host or scheme
references
- security policy: https://github.com/oras-project/oras-go/security/policy
- vulnerable code:
registry/remote/repository.go(seeblobStore.completePushAfterInitialPost)
Пакеты
oras.land/oras-go/v2
< 2.6.1
2.6.1
Связанные уязвимости
oras-go is a Go library for managing OCI artifacts. Prior to 2.6.1, registry/remote/repository.go in blobStore.completePushAfterInitialPost follows a registry-controlled Location header during monolithic blob upload and reuses the Authorization header from the initial POST request for the subsequent PUT request, allowing a malicious registry to return a cross-host Location and receive the caller's credentials at an attacker-controlled endpoint. This issue is fixed in version 2.6.1.
oras-go is a Go library for managing OCI artifacts. Prior to 2.6.1, registry/remote/repository.go in blobStore.completePushAfterInitialPost follows a registry-controlled Location header during monolithic blob upload and reuses the Authorization header from the initial POST request for the subsequent PUT request, allowing a malicious registry to return a cross-host Location and receive the caller's credentials at an attacker-controlled endpoint. This issue is fixed in version 2.6.1.
oras-go is a Go library for managing OCI artifacts. Prior to 2.6.1, registry/remote/repository.go in blobStore.completePushAfterInitialPost follows a registry-controlled Location header during monolithic blob upload and reuses the Authorization header from the initial POST request for the subsequent PUT request, allowing a malicious registry to return a cross-host Location and receive the caller's credentials at an attacker-controlled endpoint. This issue is fixed in version 2.6.1.
oras-go is a Go library for managing OCI artifacts. Prior to 2.6.1, re ...
