PolicyKit INT_MAX UID systemctl Command Execution Vulnerability
PolicyKit could allow unintended access.
A flaw was found in PolicyKit (aka polkit) 0.115 that allows a user with a uid greater than INT_MAX to successfully execute any systemctl command.
A vulnerability in PolicyKit could allow a local attacker to bypass authentication and execute any systemctl command on a targeted system. The vulnerability is due to improper handling of a user identifier (UID) with a value greater than the INT_MAX value on a targeted system. An attacker could exploit this vulnerability by accessing a targeted system and creating a user with a UID value greater than the INT_MAX value. A successful exploit could allow the attacker to bypass authentication and execute any systemctl command on the system, which could be used to conduct further attacks. Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available. PolicyKit has confirmed the vulnerability and released software updates.
CVE-2018-19788 Silly easy exploit for CVE-2018-19788 To use this, you must either create a user with UID > INT_MAX in Policy Kit or already have a low-priv user with said UID UID can be specified in user creation as follows, and used before execution of the script: $ useradd -u 4000000001 PrivEsc $ passwd PrivEsc $ su PrivEsc $ chmod +x /tmp/CVE-2018-19788_PrivEscsh $
Proof of Concept for the CVE-2018-19788 Ansible role to check the vulnerability tracked as CVE-2018-19788 that impacts PolicyKit version 0115 which comes pre-installed on a wide range of Linux distributions such as Ubuntu, Red Hat, CentOs, to mention a few Requirements Minimum required ansible version 240 Role Variables # The user name to be provisioned to execute the explo
Leveraging CVE-2018-19788 to dump protected files without root shell CVE-2018-19788 is an issue where any user with a UID over INT_MAX (IE 4000000000) can run any systemctl command on a systemd linux box, such as Ubuntu (There is already a writeup to gain a root shell found: here) The main difference between this writeup and the full root shell writeup is that this will be ru
CVE-2018-19788 Exploiting The CVE-2018-19788 PolicyKit Bug Steps to exploit PolicyKit bug on a fully patched CentOS7 installation [root@centos7 ~]# groupadd -g 4000000000 cve201819788 [root@centos7 ~]# useradd -m -c "User With High UID" -u 4000000000 -g 4000000000 -s /bin/bash cve201819788 [root@centos7 ~]# id cve201819788 uid=4000000000(cve201819788) gid=4000000000(
OverTheWire Advent Bonanza 2018 Writeup Enclosed is my writeup for the 2018 OTW Advent CTF (advent2018overthewireorg) The challenges were tough, but a lot of fun It seemed like the organizers created each challenge so that it had at least two pieces that needed to be solved before getting the flag I liked this approach although sometimes it was frustrating when I
Security Research A collection of files related to my personal security research Additional content will be posted on my blog blogmirchio Exploits CVE-2018-18629 - Privilege Escalation on Linux via keybase-redirector PoC: CVE-2018-18629 Detailed write-up: CVE-2018-18629: Keybase Linux privilege escalation Keybase Advisory: Local Privilege Escalation on Linux v
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