CVE-2020-27661 Explained : Impact and Mitigation
Learn about CVE-2020-27661, a divide-by-zero issue in dwc2_handle_packet in QEMU's USB host controller emulation, allowing a guest to crash the host's QEMU process.
A divide-by-zero issue in dwc2_handle_packet in the hcd-dwc2 USB host controller emulation of QEMU could allow a malicious guest to crash the QEMU process, leading to a denial of service.
Understanding CVE-2020-27661
This CVE involves a vulnerability in the QEMU USB host controller emulation that could be exploited by a malicious guest to cause a denial of service on the host system.
What is CVE-2020-27661?
CVE-2020-27661 is a divide-by-zero vulnerability found in dwc2_handle_packet in the hcd-dwc2 USB host controller emulation of QEMU. By exploiting this flaw, a malicious guest could crash the QEMU process on the host, resulting in a denial of service.
The Impact of CVE-2020-27661
The exploitation of this vulnerability could lead to a denial of service, causing disruption to the QEMU process on the host system.
Technical Details of CVE-2020-27661
This section provides more technical insights into the CVE.
Vulnerability Description
The vulnerability lies in the dwc2_handle_packet function in the hcd-dwc2 USB host controller emulation of QEMU, where a divide-by-zero issue exists.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: Not applicable
Exploitation Mechanism
A malicious guest can trigger the divide-by-zero issue in dwc2_handle_packet to crash the QEMU process on the host, causing a denial of service.
Mitigation and Prevention
Protecting systems from CVE-2020-27661 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply patches provided by the vendor promptly.
- Monitor vendor communications for updates and security advisories.
- Implement network segmentation to limit the impact of potential attacks.
Long-Term Security Practices
- Regularly update and patch all software and systems.
- Conduct security training for users to recognize and report suspicious activities.
- Employ intrusion detection and prevention systems to enhance security posture.
- Perform regular security audits and assessments to identify vulnerabilities.
- Stay informed about the latest security threats and best practices.
Patching and Updates
Ensure that the QEMU software is updated with the latest patches to mitigate the divide-by-zero vulnerability in dwc2_handle_packet.