6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
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
0.004 Low
EPSS
Percentile
72.3%
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 using https://github.com/mattermost/xml-roundtrip-validator.
If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.
See https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ for more information about the underlying vulnerabilities.
If you have any questions or comments about this advisory:
CPE | Name | Operator | Version |
---|---|---|---|
github.com/fleetdm/fleet/v4 | lt | 3.5.1 |
github.com/advisories/GHSA-w3wf-cfx3-6gcx
github.com/fleetdm/fleet/blob/master/CHANGELOG.md#fleet-351-dec-14-2020
github.com/fleetdm/fleet/commit/57812a532e5f749c8e18c6f6a652eca65c083607
github.com/fleetdm/fleet/security/advisories/GHSA-w3wf-cfx3-6gcx
github.com/mattermost/xml-roundtrip-validator
mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities
nvd.nist.gov/vuln/detail/CVE-2020-26276
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
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
0.004 Low
EPSS
Percentile
72.3%