SAML authentication vulnerability due to stdlib XML parsing
ImpactDue to issues in Go's standard library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted document. This can result in allowing unverified logins from a SAML IdP.Users that configure Fleet with SSO login may be vulnerable to this issue.PatchesThis issue is patched in 3.5.1 using https://github.com/mattermost/xml-roundtrip-validator.WorkaroundsIf upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.ReferencesSee https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ for more information about the underlying vulnerabilities.For more informationIf you have any questions or comments about this advisory:Email us at [security@fleetdm.com](mailto:security@fleetdm.com)Join #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)