GitLab CE/EE - Remote Code Execution

2021-10-2712:31:04

ProjectDiscovery

github.com

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

9.8 High

AI Score

Confidence

High

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.975 High

EPSS

Percentile

100.0%

JSON

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.

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: 0.97333
    epss-percentile: 0.99868
    cpe: cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*
  metadata:
    max-request: 1
    vendor: gitlab
    product: gitlab
    shodan-query: http.title:"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: 490a00463044022021787cd9270a230364edc25682b32eedd71949d7c6a77c9b84308a540f85761502203bbfe2d4d8ee766566ca25be55039a765ee27d86e8b66ff4f6971796a255e1e0:922c64590222798bb761d5b6d8e72950