PH49566: OIDC: CWTAI2047E WHEN MORE THAN ONE KEY WITHOUT ALG CLAIM IN JWK

APAR status

• Closed as program error.

Error description

• When the OpenID Connect (OIDC) Trust Association Interceptor
  (TAI) attempts to process a JWK that contains more than one
  key that do not contain an "alg" claim, an error similar to the
  following error is found in the logs:
  
  CWTAI2047E: No key was found to verify the signature. The
  signature algorithm is [RS256]. The JWT [kid] claim value is
  [YOURKID] and the [x5t] claim value is [YOURX5T]. The
  [jwkEndpointUrl] is [https://acme.com/jwk.jwks]. The
  [signVerifyAlias] property value is [ALIAS].
  
  This issue happens after installing fix pack 9.0.5.13.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  *                  and OIDC                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: OIDC TAI CWTAI2047E error when more     *
  *                      than                                    *
  *                      one key in JWK with no "alg" claim.     *
  ****************************************************************
  * RECOMMENDATION:  Install a fix pack or interim fix that      *
  *                  contains this APAR.                         *
  ****************************************************************
  When the OpenID Connect (OIDC) Trust Association Interceptor
  (TAI) attempts to process a JWK that contains more than one
  key that do not contain an "alg" claim, a CWTAI2047E error might
  occur.
  

Problem conclusion

• The OIDC TAI is updated to allow for keys with no "sig" claim in
  JWK.
  
  The fix for this APAR is targeted for inclusion in fix pack
  8.5.5.23 and 9.0.5.14. For more information, see 'Recommended
  Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBS APP SERV N

• Fixed component ID

  5724H8800

Applicable component levels