GHSA-w3wf-cfx3-6gcx SAML authentication vulnerability due to stdlib XML parsing

• Go github.com/fleetdm/fleet/v4: < 3.5.1 → fixed in 3.5.1

Impact Due 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. Patches This issue is patched in 3.5.1 using https://github.com/mattermost/xml-roundtrip-validator. Workarounds If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet. References See https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ for more information about the underlying vulnerabilities. For more information If you have any questions or comments about this advisory: • Email us at [email protected] • Join #fleet in osquery Slack