CVE-2020-26276 SAML authentication vulnerability in Fleet

2020-12-1719:40:14

CWE-290

GitHub_M

www.cve.org

10 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

9.4 High

AI Score

Confidence

High

0.004 Low

EPSS

Percentile

72.3%

JSON

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.

CNA Affected

[
  {
    "product": "fleet",
    "vendor": "fleetdm",
    "versions": [
      {
        "status": "affected",
        "version": "< 3.5.1"
      }
    ]
  }
]