CVE-2020-26276

CVSS V2 Medium 6.8 CVSS V3 Critical 9.8
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.
Overview
  • CVE ID
  • CVE-2020-26276
  • Assigner
  • security-advisories@github.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2020-12-17T20:15:13
  • Last Modified Date
  • 2020-12-18T19:11:51
Weakness Enumerations
CWE URL
CWE-290 http://cwe.mitre.org/data/definitions/290.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:* 1 OR 3.5.1
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:P/I:P/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • PARTIAL
  • Integrity Impact
  • PARTIAL
  • Availability Impact
  • PARTIAL
  • Base Score
  • 6.8
  • Severity
  • MEDIUM
  • Exploitability Score
  • 8.6
  • Impact Score
  • 6.4
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • HIGH
  • Availability Impact
  • HIGH
  • Base Score
  • 9.8
  • Base Severity
  • CRITICAL
  • Exploitability Score
  • 3.9
  • Impact Score
  • 5.9
References
Reference URL Reference Tags
https://github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020 Release Notes Third Party Advisory
https://github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607 Patch Third Party Advisory
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities Not Applicable Third Party Advisory
https://github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx Third Party Advisory
https://github.com/mattermost/xml-roundtrip-validator Third Party Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2020-26276
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26276
History
Created Old Value New Value Data Type Notes
2022-05-10 07:29:49 Added to TrackCVE
2022-12-05 18:29:34 2020-12-17T20:15Z 2020-12-17T20:15:13 CVE Published Date updated
2022-12-05 18:29:34 2020-12-18T19:11:51 CVE Modified Date updated
2022-12-05 18:29:34 Analyzed Vulnerability Status updated