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Advisories

OpenAM before 16.1.4 PKCE Bypass in OAuth 2.0 Device Authorization Flow

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Severity
high
Date
Affecting

  • OpenAM >= 0, < 16.1.4

CWE
  • CWE-358 Improperly Implemented Security Check for Standard
CVSS
7.6
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
manus-pi, vharseko, maximthomas, tsujiguchitky, manus-use
Description
OpenAM before 16.1.4 fails to enforce PKCE in the OAuth 2.0 device authorization flow, never validating the code verifier when device codes are exchanged for tokens. Attackers who obtain an approved device code from client logs or shared device storage can redeem it for access and ID tokens to impersonate the user.

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