CVE-2019-12928 : Security Advisory and Response

QEMU prior to version 4.0.0 is vulnerable to OS command injection through the QMP migrate command, potentially allowing remote attackers to execute code, cause denial of service, or disclose information.

Understanding CVE-2019-12928

What is CVE-2019-12928?

The vulnerability in the QMP migrate command of QEMU versions before 4.0.0 allows for OS command injection, posing risks of code execution, denial of service, or information exposure when a specially crafted QMP command is sent to the server.

The Impact of CVE-2019-12928

The -qmp interface of QEMU is intended for trusted users, but if accessible via an internet-facing tcp socket, it raises concerns about insecure configurations.

Technical Details of CVE-2019-12928

Vulnerability Description

The QMP migrate command in QEMU versions prior to 4.0.0 is susceptible to OS command injection, enabling remote attackers to execute code, cause denial of service, or disclose information.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: All versions prior to 4.0.0

Exploitation Mechanism

The vulnerability can be exploited by sending a specifically crafted QMP command to the server listening on the -qmp interface.

Mitigation and Prevention

Immediate Steps to Take

Ensure that the QMP interface is not accessible via an internet-facing tcp socket.
Update QEMU to version 4.0.0 or later to mitigate the vulnerability.

Long-Term Security Practices

Regularly monitor and restrict access to critical interfaces.
Implement network segmentation to prevent unauthorized access.

Patching and Updates

Apply patches and updates provided by QEMU to address the vulnerability.