CVE-2020-26276

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
10 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
GitHub_MCNA
10 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVEADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 75%
VendorProductVersion
fleetdmfleet
𝑥
< 3.5.1
𝑥
= Vulnerable software versions
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
fleet
groovy
dne
focal
dne
bionic
dne
xenial
not-affected
trusty
dne
Common Weakness Enumeration
References
https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020
https://github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607
https://github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx
https://github.com/mattermost/xml-roundtrip-validator
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities
https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020
https://github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607
https://github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx
https://github.com/mattermost/xml-roundtrip-validator
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities