Vulnerability Description
Fleet is an open source osquery manager. In Fleet before version 3.5.1, 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. This issue is patched in 3.5.1. The fix was made using https://github.com/mattermost/xml-roundtrip-validator If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fleetdm | Fleet | < 3.5.1 |
Related Weaknesses (CWE)
References
- https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020Release NotesThird Party Advisory
- https://github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607PatchThird Party Advisory
- https://github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcxThird Party Advisory
- https://github.com/mattermost/xml-roundtrip-validatorThird Party Advisory
- https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilitiesNot ApplicableThird Party Advisory
- https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020Release NotesThird Party Advisory
- https://github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607PatchThird Party Advisory
- https://github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcxThird Party Advisory
- https://github.com/mattermost/xml-roundtrip-validatorThird Party Advisory
- https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilitiesNot ApplicableThird Party Advisory
FAQ
What is CVE-2020-26276?
CVE-2020-26276 is a vulnerability with a CVSS score of 10.0 (CRITICAL). Fleet is an open source osquery manager. In Fleet before version 3.5.1, due to issues in Go's standard library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted do...
How severe is CVE-2020-26276?
CVE-2020-26276 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2020-26276?
Check the references section above for vendor advisories and patch information. Affected products include: Fleetdm Fleet.