SAML authentication vulnerability in Fleet
CVE-2020-26276

10CRITICAL

Key Information:

Vendor

Fleetdm

Status
Fleet
Vendor
CVE Published:
17 December 2020

What is 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.

Affected Version(s)

fleet < 3.5.1

References

https://github.com/fleetdm/fleet/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/fleetdm/fleet/commit/57812a532e5f749c8...
x_refsource_MISC
https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md...
x_refsource_MISC

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.