CVE-2022-0358 : Security Advisory and Response
Learn about CVE-2022-0358 impacting QEMU virtiofsd, allowing local users to escalate privileges within guest systems and on host machines. Find mitigation strategies and patch details.
A flaw in the QEMU virtio-fs shared file system daemon (virtiofsd) implementation has the potential to allow local users to escalate privileges both within the guest and on the host system.
Understanding CVE-2022-0358
This vulnerability is directly related to CVE-2018-13405 and affects the QEMU/virtiofsd product, potentially leading to unauthorized access and privilege escalation.
What is CVE-2022-0358?
The flaw in virtiofsd allows a local guest user to create files with unintended group ownership in shared directories, enabling access to resources accessible to the root group.
The Impact of CVE-2022-0358
Malicious unprivileged users within the guest could leverage this flaw to escalate their privileges, while local users in the host system could also exploit the vulnerability, escalating their privileges.
Technical Details of CVE-2022-0358
This section provides insights into the vulnerability's description, affected systems and versions, as well as the exploitation mechanism.
Vulnerability Description
The flaw allows unauthorized group ownership of files created by a local guest user within shared virtiofsd directories, potentially granting access to root group resources.
Affected Systems and Versions
QEMU/virtiofsd versions up to qemu v6.2.0-7 are impacted by this vulnerability, as fixed in the mentioned version.
Exploitation Mechanism
Local guest users can exploit the flaw to create unexpected executable files, enabling access to resources of the root group within the guest and potentially escalating their privileges.
Mitigation and Prevention
To protect systems from CVE-2022-0358, immediate steps, long-term security practices, and the importance of timely patching and updates are crucial.
Immediate Steps to Take
Ensure access controls are configured correctly, restrict user permissions, and monitor file creations within shared virtiofsd directories.
Long-Term Security Practices
Implement regular security training, maintain awareness of known vulnerabilities, and conduct thorough security audits.
Patching and Updates
Deploy the necessary patches promptly, stay informed about security advisories, and prioritize the update of affected systems and software.