asepsaepdin / CVE-2021-3560

CVE-2021-3560 - Polkit Local Privilege Escalation

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⚠️ For educational and authorized security research purposes only

Original Exploit Authors

Very grateful to the original PoC author @UNICORDev by (@NicPWNs and @Dev-Yeoj)

Description

It was found that polkit could be tricked into bypassing the credential checks for D-Bus requests, elevating the privileges of the requestor to the root user. This flaw could be used by an unprivileged local attacker to, for example, create a new local administrator. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Demo

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Step Guides

1. Install git, then clone the script from the github repository:

   sudo apt install git python3 -y
   git clone https://github.com/asepsaepdin/CVE-2021-3560.git

2. Run the PoC script using command:

   python3 exploit-CVE-2021-3560.py -u hacker -p password

   Notes: specify -u options with the intended username and -p options with the intended password

3. Verify the created user using command:

   su hacker
   id

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Credits

• https://nvd.nist.gov/vuln/detail/CVE-2021-3560
• https://app.hackthebox.com/machines/Paper
• https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/
• https://github.com/Almorabea/Polkit-exploit/blob/main/CVE-2021-3560.py