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GitLab CE/EE - Remote Code Execution

ID: CVE-2021-22205

Severity: critical

Author: GitLab Red Team

Tags: cve2021,cve,kev,hackerone,gitlab,rce

Description

Section titled “Description”

GitLab CE/EE starting from 11.9 does not properly validate image files that were passed to a file parser, resulting in a remote command execution vulnerability. This template attempts to passively identify vulnerable versions of GitLab without the need for an exploit by matching unique hashes for the application-.css file in the header for unauthenticated requests. Positive matches do not guarantee exploitability. Tooling to find relevant hashes based on the semantic version ranges specified in the CVE is linked in the references section below.

YAML Source

Section titled “YAML Source”
id: CVE-2021-22205


info:
  name: GitLab CE/EE - Remote Code Execution
  author: GitLab Red Team
  severity: critical
  description: GitLab CE/EE starting from 11.9 does not properly validate image files that were passed to a file parser, resulting in a remote command execution vulnerability. This template attempts to passively identify vulnerable versions of GitLab without the need for an exploit by matching unique hashes for the application-<hash>.css file in the header for unauthenticated requests. Positive matches do not guarantee exploitability. Tooling to find relevant hashes based on the semantic version ranges specified in the CVE is linked in the references section below.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected GitLab instance.
  remediation: |
    Upgrade to GitLab CE/EE version 13.10.3 or 13.11.1 to mitigate this vulnerability.
  reference:
    - https://gitlab.com/gitlab-com/gl-security/security-operations/gl-redteam/red-team-research/cve-2021-22205-hash-generator
    - https://gitlab.com/gitlab-com/gl-security/security-operations/gl-redteam/red-team-operations/-/issues/196
    - https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22205.json
    - https://censys.io/blog/cve-2021-22205-it-was-a-gitlab-smash/
    - https://security.humanativaspa.it/gitlab-ce-cve-2021-22205-in-the-wild/
    - https://hackerone.com/reports/1154542
    - https://nvd.nist.gov/vuln/detail/CVE-2021-22205
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2021-22205
    cwe-id: CWE-94
    epss-score: 0.97463
    epss-percentile: 0.99959
    cpe: cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*
  metadata:
    max-request: 1
    vendor: gitlab
    product: gitlab
    shodan-query:
      - http.title:"GitLab"
      - cpe:"cpe:2.3:a:gitlab:gitlab"
      - http.title:"gitlab"
    fofa-query: title="gitlab"
    google-query: intitle:"gitlab"
  tags: cve2021,cve,kev,hackerone,gitlab,rce


http:
  - method: GET
    path:
      - "{{BaseURL}}/users/sign_in"


    host-redirects: true
    max-redirects: 3
    matchers:
      - type: word
        words:
          - "015d088713b23c749d8be0118caeb21039491d9812c75c913f48d53559ab09df"
          - "02aa9533ec4957bb01d206d6eaa51d762c7b7396362f0f7a3b5fb4dd6088745b"
          - "051048a171ccf14f73419f46d3bd8204aa3ed585a72924faea0192f53d42cfce"
          - "08858ced0ff83694fb12cf155f6d6bf450dcaae7192ea3de8383966993724290"
          - "0993beabc8d2bb9e3b8d12d24989426b909921e20e9c6a704de7a5f1dfa93c59"
          - "0a5b4edebfcb0a7be64edc06af410a6fbc6e3a65b76592a9f2bcc9afea7eb753"
          - "1084266bd81c697b5268b47c76565aa86b821126a6b9fe6ea7b50f64971fc96f"
          - "14c313ae08665f7ac748daef8a70010d2ea9b52fd0cae594ffa1ffa5d19c43f4"
          - "1626b2999241b5a658bddd1446648ed0b9cc289de4cc6e10f60b39681a0683c4"
          - "20f01320ba570c73e01af1a2ceb42987bcb7ac213cc585c187bec2370cf72eb6"
          - "27d2c4c4e2fcf6e589e3e1fe85723537333b087003aa4c1d2abcf74d5c899959"
          - "292ca64c0c109481b0855aea6b883a588bd293c6807e9493fc3af5a16f37f369"
          - "2eaf7e76aa55726cc0419f604e58ee73c5578c02c9e21fdbe7ae887925ea92ae"
          - "30a9dffe86b597151eff49443097496f0d1014bb6695a2f69a7c97dc1c27828f"
          - "318ee33e5d14035b04832fa07c492cdf57788adda50bb5219ef75b735cbf00e2"
          - "33313f1ff2602ef43d945e57e694e747eb00344455ddb9b2544491a3af2696a1"
          - "335f8ed58266e502d415f231f6675a32bb35cafcbaa279baa2c0400d4a9872ac"
          - "34031b465d912c7d03e815c7cfaff77a3fa7a9c84671bb663026d36b1acd3f86"
          - "3407a4fd892e9d5024f3096605eb1e25cad75a8bf847d26740a1e6a77e45b087"
          - "340c31a75c5150c5e501ec143849adbed26fed0da5a5ee8c60fb928009ea3b86"
          - "38981e26a24308976f3a29d6e5e2beef57c7acda3ad0d5e7f6f149d58fd09d3d"
          - "3963d28a20085f0725884e2dbf9b5c62300718aa9c6b4b696c842a3f4cf75fcd"
          - "39b154eeefef684cb6d56db45d315f8e9bf1b2cc86cf24d8131c674521f5b514"
          - "39fdbd63424a09b5b065a6cc60c9267d3f49950bf1f1a7fd276fe1ece4a35c09"
          - "3b51a43178df8b4db108a20e93a428a889c20a9ed5f41067d1a2e8224740838e"
          - "3cbf1ae156fa85f16d4ca01321e0965db8cfb9239404aaf52c3cebfc5b4493fb"
          - "40d8ac21e0e120f517fbc9a798ecb5caeef5182e01b7e7997aac30213ef367b3"
          - "4448d19024d3be03b5ba550b5b02d27f41c4bdba4db950f6f0e7136d820cd9e1"
          - "450cbe5102fb0f634c533051d2631578c8a6bae2c4ef1c2e50d4bfd090ce3b54"
          - "455d114267e5992b858fb725de1c1ddb83862890fe54436ffea5ff2d2f72edc8"
          - "4568941e60dbfda3472e3f745cd4287172d4e6cce44bed85390af9e4e2112d0b"
          - "45b2cf643afd34888294a073bf55717ea00860d6a1dca3d301ded1d0040cac44"
          - "473ef436c59830298a2424616d002865f17bb5a6e0334d3627affa352a4fc117"
          - "4990bb27037f3d5f1bffc0625162173ad8043166a1ae5c8505aabe6384935ce2"
          - "4a081f9e3a60a0e580cad484d66fbf5a1505ad313280e96728729069f87f856e"
          - "4abc4e078df94075056919bd59aed6e7a0f95067039a8339b8f614924d8cb160"
          - "504940239aafa3b3a7b49e592e06a0956ecaab8dbd4a5ea3a8ffd920b85d42eb"
          - "52560ba2603619d2ff1447002a60dcb62c7c957451fb820f1894e1ce7c23821c"
          - "530a8dd34c18ca91a31fbae2f41d4e66e253db0343681b3c9640766bf70d8edf"
          - "5440e2dd89d3c803295cc924699c93eb762e75d42178eb3fe8b42a5093075c71"
          - "62e4cc014d9d96f9cbf443186289ffd9c41bdfe951565324891dcf38bcca5a51"
          - "64e10bc92a379103a268a90a7863903eacb56843d8990fff8410f9f109c3b87a"
          - "655ad8aea57bdaaad10ff208c7f7aa88c9af89a834c0041ffc18c928cc3eab1f"
          - "67ac5da9c95d82e894c9efe975335f9e8bdae64967f33652cd9a97b5449216d2"
          - "69a1b8e44ba8b277e3c93911be41b0f588ac7275b91a184c6a3f448550ca28ca"
          - "6ae610d783ba9a520b82263f49d2907a52090fecb3ac37819cea12b67e6d94fb"
          - "70ce56efa7e602d4b127087b0eca064681ecdd49b57d86665da8b081da39408b"
          - "7310c45f08c5414036292b0c4026f281a73cf8a01af82a81257dd343f378bbb5"
          - "73a21594461cbc9a2fb00fc6f94aec1a33ccf435a7d008d764ddd0482e08fc8d"
          - "77566acc818458515231d0a82c131a42890d771ea998b9f578dc38e0eb7e517f"
          - "78812856e55613c6803ecb31cc1864b7555bf7f0126d1dfa6f37376d37d3aeab"
          - "79837fd1939f90d58cc5a842a81120e8cecbc03484362e88081ebf3b7e3830e9"
          - "7b1dcbacca4f585e2cb98f0d48f008acfec617e473ba4fd88de36b946570b8b9"
          - "7f1c7b2bfaa6152740d453804e7aa380077636cad101005ed85e70990ec20ec5"
          - "81c5f2c7b2c0b0abaeb59585f36904031c21b1702c24349404df52834fbd7ad3"
          - "83dc10f687305b22e602ba806619628a90bd4d89be7c626176a0efec173ecff1"
          - "93ebf32a4bd988b808c2329308847edd77e752b38becc995970079a6d586c39b"
          - "969119f639d0837f445a10ced20d3a82d2ea69d682a4e74f39a48a4e7b443d5e"
          - "9b4e140fad97320405244676f1a329679808e02c854077f73422bd8b7797476b"
          - "9c095c833db4364caae1659f4e4dcb78da3b5ec5e9a507154832126b0fe0f08e"
          - "a0c92bafde7d93e87af3bc2797125cba613018240a9f5305ff949be8a1b16528"
          - "a9308f85e95b00007892d451fd9f6beabcd8792b4c5f8cd7524ba7e941d479c9"
          - "ac9b38e86b6c87bf8db038ae23da3a5f17a6c391b3a54ad1e727136141a7d4f5"
          - "ae0edd232df6f579e19ea52115d35977f8bdbfa9958e0aef2221d62f3a39e7d8"
          - "aeddf31361633b3d1196c6483f25c484855e0f243e7f7e62686a4de9e10ec03b"
          - "b50bfeb87fe7bb245b31a0423ccfd866ca974bc5943e568ce47efb4cd221d711"
          - "b64a1277a08c2901915525143cd0b62d81a37de0a64ec135800f519cb0836445"
          - "bb1565ffd7c937bea412482ed9136c6057be50356f1f901379586989b4dfe2ca"
          - "be9a23d3021354ec649bc823b23eab01ed235a4eb730fd2f4f7cdb2a6dee453a"
          - "bec9544b57b8b2b515e855779735ad31c3eacf65d615b4bfbd574549735111e7"
          - "bf1ba5d5d3395adc5bad6f17cc3cb21b3fb29d3e3471a5b260e0bc5ec7a57bc4"
          - "bf1c397958ee5114e8f1dadc98fa9c9d7ddb031a4c3c030fa00c315384456218"
          - "c8d8d30d89b00098edab024579a3f3c0df2613a29ebcd57cdb9a9062675558e4"
          - "c923fa3e71e104d50615978c1ab9fcfccfcbada9e8df638fc27bf4d4eb72d78c"
          - "d0850f616c5b4f09a7ff319701bce0460ffc17ca0349ad2cf7808b868688cf71"
          - "d161b6e25db66456f8e0603de5132d1ff90f9388d0a0305d2d073a67fd229ddb"
          - "d56f0577fbbbd6f159e9be00b274270cb25b60a7809871a6a572783b533f5a3c"
          - "d812b9bf6957fafe35951054b9efc5be6b10c204c127aa5a048506218c34e40f"
          - "dc6b3e9c0fad345e7c45a569f4c34c3e94730c33743ae8ca055aa6669ad6ac56"
          - "def1880ada798c68ee010ba2193f53a2c65a8981871a634ae7e18ccdcd503fa3"
          - "e2578590390a9eb10cd65d130e36503fccb40b3921c65c160bb06943b2e3751a"
          - "e4b6f040fe2e04c86ed1f969fc72710a844fe30c3501b868cb519d98d1fe3fd0"
          - "eb078ffe61726e3898dc9d01ea7955809778bde5be3677d907cbd3b48854e687"
          - "ec9dfedd7bd44754668b208858a31b83489d5474f7606294f6cc0128bb218c6d"
          - "ed4780bb05c30e3c145419d06ad0ab3f48bd3004a90fb99601f40c5b6e1d90fd"
          - "ef53a4f4523a4a0499fb892d9fb5ddb89318538fef33a74ce0bf54d25777ea83"
          - "f154ef27cf0f1383ba4ca59531058312b44c84d40938bc8758827023db472812"
          - "f7d1309f3caef67cb63bd114c85e73b323a97d145ceca7d6ef3c1c010078c649"
          - "f9ab217549b223c55fa310f2007a8f5685f9596c579f5c5526e7dcb204ba0e11"
        condition: or


    extractors:
      - type: regex
        group: 1
        regex:
          - '(?:application-)(\S{64})(?:\.css)'
# digest: 4a0a00473045022100ce6c0443de847c08cddaa5407f061eeb0ceb63491ac9ec369de50e9f6e011c1f02207adbfef79c2a2a9b13d7b1f6c5ce30567a2cdc639c9c9d7449027bfe69440b3d:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-22205.yaml"

View on Github