CVE-2020-14394 : Exploit Details and Defense Strategies
Learn about CVE-2020-14394, an infinite loop flaw in QEMU's USB xHCI controller emulation, allowing a guest user to hang the process, leading to denial of service. Find mitigation steps and affected versions here.
An infinite loop flaw in the USB xHCI controller emulation of QEMU can lead to a denial of service on the host system.
Understanding CVE-2020-14394
A flaw in QEMU's USB xHCI controller emulation can be exploited by a privileged guest user to hang the QEMU process, resulting in a denial of service.
What is CVE-2020-14394?
This CVE refers to an infinite loop vulnerability in the USB xHCI controller emulation of QEMU when calculating the length of the Transfer Request Block (TRB) Ring.
The Impact of CVE-2020-14394
The vulnerability allows a privileged guest user to hang the QEMU process on the host, leading to a denial of service condition.
Technical Details of CVE-2020-14394
The following are the technical details of CVE-2020-14394:
Vulnerability Description
An infinite loop flaw in the USB xHCI controller emulation of QEMU while computing the length of the TRB Ring.
Affected Systems and Versions
- Vendor: n/a
- Product: QEMU
- Affected Version: QEMU 6.1.50
Exploitation Mechanism
The flaw can be exploited by a privileged guest user to hang the QEMU process on the host, causing a denial of service.
Mitigation and Prevention
Steps to address CVE-2020-14394:
Immediate Steps to Take
- Apply vendor patches and updates promptly.
- Monitor vendor advisories for security patches.
Long-Term Security Practices
- Regularly update and patch software to mitigate known vulnerabilities.
- Implement least privilege access controls to limit the impact of potential exploits.
- Conduct regular security assessments and audits.
Patching and Updates
- Update QEMU to a non-vulnerable version.