operator
ChainsTTPsBlogLogin
menu
Prelude TTP browser

Create root user in /etc/passwd via CVE-2021-3156

Tactic: Persistence
Professional
This is a professional level chain. This TTP requires an professional license to use.info
/static/assets/linux-logo.svg
Create a root persistence user account "prelude" via the Heap-Based Buffer Overflow in Sudo (Baron Samedit) identified in CVE-2021-3156. Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character. This appends a line to /etc/passwd so you can later `su prelude` using the generated password.
locked
View Command

To view this TTPs command, you must be logged in with a professional or enterprise license.

Login

Authors

khyberspache

worawit wangwarunyoo

Tactic

Persistence

Test this TTP

Download Operator (1.7.1)
Test this TTP using one of our Operator chains
Baron Samedit (Persistence)

2021-08-10

/static/assets/linux-logo.svg
Leverage a Heap-Based Buffer Overflow in Sudo to create a persistence user.
About PreludePrelude hardens an organization's defenses by continuously “asking” it questions through the form of safe cyberattacks. These attacks respond immediately to the latest vulnerabilities and cyber events, turning complex technical descriptions into deployable “questions”.Our mission is to increase the reach, frequency and usage of advanced security for all organizations.
twitterFollow @preludeorg on Twitter for new chains and more.
discordJoin the Prelude Discord to discuss chains and more.
githubKeep up to date with code changes and community activity on Github
operator
preludesecurity.comCareersTactics & TechniquesAttack themes
Privacy Policysupport@preludesecurity.com© 2023 Prelude Research, Inc.All rights reserved. Prelude, its logo and other trademarks are trademarks of Prelude Research, Inc. and may not be used without permission.