SB2020050514 - Denial of service in QEMU

Description

This security bulletin contains information about 1 vulnerability.

1) Resource management error (CVE-ID: CVE-2020-10717)

CWE-ID: CWE-399 - Resource Management Errors

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources with the virtio-fs shared file system daemon (virtiofsd) implementation of the QEMU. Virtio-fs is meant to share a host file system directory with a guest via virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the host.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10717
• https://www.openwall.com/lists/oss-security/2020/05/04/1
• https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00143.html
• https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00141.html