Vulnerability in Fleetdm Fleet
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.022 (82.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
- Fleetdm Fleet — versions < 3.5.1
Weakness classification (CWE)
References
- github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx (Third Party Advisory)
- github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607 (Patch, Third Party Advisory)
- github.com/fleetdm/fleet/blob/master/CHANGELOG.md (Third Party Advisory, Release Notes)
- github.com/mattermost/xml-roundtrip-validator (Third Party Advisory)
- mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities (Third Party Advisory, Not Applicable)
Frequently asked questions
- What is CVE-2020-26276?
- CVE-2020-26276 is a critical-severity vulnerability in Fleetdm Fleet, classified under Authentication Bypass by Spoofing. CVSS score: 10.0/10. Published 2020-12-17.
- How severe is CVE-2020-26276?
- Critical severity. CVSS v3 base score is 10.0 out of 10.