Summary

The jwt authentication function of kubepi <= v1.6.2 uses hard-coded Jwtsigkeys, resulting in the same Jwtsigkeys for all online projects. This means that an attacker can forge any jwt token to take over the administrator account of any online project.

Details

session.go, the use of hard-coded JwtSigKey allows an attacker to use this value to forge jwt tokens arbitrarily. The JwtSigKey is confidential and should not be hard-coded in the code.

var JwtSigKey = []byte("signature_hmac_secret_shared_key")
var jwtMaxAge = 10 * time.Minute

type Handler struct {
	userService        user.Service
	roleService        role.Service
	clusterService     cluster.Service
	rolebindingService rolebinding.Service
	ldapService        ldap.Service
	jwtSigner          *jwt.Signer
}

Affected Version

<= v1.6.2

Patches

The vulnerability has been fixed in v1.6.3.

3be58b8 : JWT key can be specified in app.yml, if leave it blank a random key will be used.

Workarounds

It is recommended to upgrade the version to v1.6.3.

For more information

If you have any questions or comments about this advisory, please open an issue.

This vulnerability is reported by shangrui-hash from huntr.dev.