CVE-2021-41091 Explained : Impact and Mitigation
Learn about CVE-2021-41091 affecting Moby Docker Engine, allowing unauthorized execution of programs by unprivileged users. Find mitigation steps and updates here.
A bug in Moby (Docker Engine) allowed unprivileged Linux users to execute programs due to insufficiently restricted permissions on the data directory.
Understanding CVE-2021-41091
What is CVE-2021-41091?
Moby, an open-source project for software containerization, had a vulnerability where certain directories had inadequate permissions, enabling unprivileged users to run programs they should not have access to.
The Impact of CVE-2021-41091
The vulnerability could allow unprivileged users to execute programs with elevated permissions, potentially leading to unauthorized access and data manipulation.
Technical Details of CVE-2021-41091
Vulnerability Description
The bug in Moby (Docker Engine) allowed unprivileged Linux users to traverse directories and execute programs with extended permission bits.
Affected Systems and Versions
- Product: Moby
- Vendor: Moby
- Versions Affected: < 20.10.9
Exploitation Mechanism
- Unprivileged Linux users could execute programs with extended permissions.
Mitigation and Prevention
Immediate Steps to Take
- Update Moby (Docker Engine) to version 20.10.9.
- Stop and restart running containers to fix permissions.
- Limit access to the host and host volumes to trusted users and containers.
Long-Term Security Practices
- Regularly update software and follow best practices for Linux security.
Patching and Updates
- Ensure timely installation of security patches to protect against known vulnerabilities.