Paper/Archive/CVE-2020-26276

CVE-2020-26276

fleetdm fleet — SAML authentication vulnerability in Fleet

CVSS 10.0 (CNA)10.0 / 10 × 3030.0 Not in CISA KEV+300.0 EPSS percentile 82.5.825 × 2016.5 No public exploit+100.0 SSVC exploitation: unknown+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

fleet< 3.5.1–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

refgithub.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx refgithub.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607 refgithub.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020 refgithub.com/mattermost/xml-roundtrip-validator refmattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities