Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-4pc7-vqv5-5r3v
Advisory ID github_osv/GHSA-4pc7-vqv5-5r3v
Aliases CVE-2021-3827
Summary ECP SAML binding bypasses authentication flows ### Description A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.
Status Published
Exploitability 0.5
Weighted Severity 7.3
Risk 3.6
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-287 Improper Authentication
System Score Found at
cvssv3.1 8.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/04/GHSA-4pc7-vqv5-5r3v/GHSA-4pc7-vqv5-5r3v.json
generic_textual HIGH
Reference id Reference type URL
https://bugzilla.redhat.com/show_bug.cgi?id=2007512
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d
CVE-2021-3827 https://access.redhat.com/security/cve/CVE-2021-3827
CVE-2021-3827 https://nvd.nist.gov/vuln/detail/CVE-2021-3827
GHSA-4pc7-vqv5-5r3v https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/04/GHSA-4pc7-vqv5-5r3v/GHSA-4pc7-vqv5-5r3v.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.