CVE-2020-26276 Information

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 Vector

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

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8