Denial of service in QEMU



Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2020-10717
CWE-ID CWE-399
Exploitation vector Network
Public exploit N/A
Vulnerable software
 QEMU
Client/Desktop applications / Virtualization software

Vendor QEMU

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource management error

EUVDB-ID: #VU27542

Risk: Medium

CVSSv4.0: 4.9 [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/E:U/U:Green]

CVE-ID: CVE-2020-10717

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

QEMU: 4.0.0 - 5.0.0

CPE2.3 External links

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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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