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Advisories

Coder before 2.29.21, 2.34.12, 2.35.9, 2.36.7, and 2.37.4 Missing Audience Validation in GCP Instance-Identity Authentication

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Severity
high
Date
Affecting

  • coder >= 2.37.0, < 2.37.4

  • coder >= 2.36.0, < 2.36.7

  • coder >= 2.35.0, < 2.35.9

  • coder >= 2.30.0, < 2.34.12

  • coder >= 0, < 2.29.21

CWE
  • CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')
CVSS
8.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
matte1782
Description
Coder before 2.29.21, 2.30.0 before 2.34.12, 2.35.0 before 2.35.9, 2.36.0 before 2.36.7, and 2.37.0 before 2.37.4 does not validate the audience claim of GCE instance-identity JWTs at the POST /api/v2/workspaceagents/google-instance-identity endpoint. Attackers who obtain an unexpired format=full identity token minted for another relying party can replay it to obtain that workspace agent's session token, which remains valid until the workspace's next build.

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