High severityNVD Advisory· Published Dec 17, 2020· Updated Aug 4, 2024
SAML authentication vulnerability in Fleet
CVE-2020-26276
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/fleetdm/fleet/v4Go | < 3.5.1 | 3.5.1 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-w3wf-cfx3-6gcxghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-26276ghsaADVISORY
- github.com/fleetdm/fleet/blob/master/CHANGELOG.mdghsax_refsource_MISCWEB
- github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607ghsax_refsource_MISCWEB
- github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcxghsax_refsource_CONFIRMWEB
- mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilitiesghsax_refsource_MISCWEB
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