CVE-2020-26276

moderate-risk
Published 2020-12-17

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.

Do I need to act?

-
0.98% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
+
Fix available
Upgrade to: 55a2aa2c955a99483b730e60207e4afada7bda8a, 57812a532e5f749c8e18c6f6a652eca65c083607
10
CVSS 10.0/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Fleetdm

References (10)

Release Notes https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020
Patch https://github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607
Third Party Advisory https://github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx
Third Party Advisory https://github.com/mattermost/xml-roundtrip-validator
Not Applicable https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities
Release Notes https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020
Patch https://github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607
Third Party Advisory https://github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx
Third Party Advisory https://github.com/mattermost/xml-roundtrip-validator
Not Applicable https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities
41
/ 100
moderate-risk
Severity 33/34 · Critical
Exploitability 3/34 · Minimal
Exposure 5/34 · Minimal