Sudo chroot Local Privilege Escalation Vulnerability

漏洞信息

漏洞名称： Sudo chroot Local Privilege Escalation Vulnerability

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是一个在Linux系统中通过滥用sudo chroot命令实现本地权限提升至root的漏洞。该漏洞存在于允许未授权用户执行sudo chroot命令且未施加适当限制的系统中，攻击者可利用此漏洞执行任意命令，从而完全控制系统。

受影响产品: sudo是Linux系统中一个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的命令。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配置不当的情况下，可能导致安全风险。此漏洞主要影响允许未授权用户执行sudo chroot命令的系统，包括但不限于Ubuntu 20.04及以后版本、Debian 10及以后版本、CentOS 7及以后版本等Linux发行版。

漏洞解释: 此漏洞属于权限提升类型，其技术根源在于sudo命令的配置不当，特别是chroot命令的使用未受到严格限制。攻击者可以通过构造特定的命令序列，绕过预期的目录限制，执行任意命令，从而获得root权限。

影响分析: 该漏洞的安全风险极高，因为它允许本地用户无需认证即可提升至root权限，进而执行任意操作，包括但不限于数据泄露、服务中断、系统完全控制等。由于攻击者可以在本地执行攻击，且攻击过程可以自动化，因此该漏洞的潜在影响范围广泛，特别是在多用户环境或共享主机环境中。及时更新系统补丁、限制sudo chroot命令的使用权限，以及实施有效的日志监控是缓解此漏洞的关键措施。

产品厂商： Linux

产品名称： sudo

来源： https://github.com/danielsummerton12/sudo-zero-day-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.