CVE-2023-3354

Improper i/o watch removal in tls handshake can lead to remote unauthenticated denial of service

Description

A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.07%
Third-Party Advisory redhat.com
Affected: n/a qemu
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat OpenStack Platform 13 (Queens)
Affected: Fedora Fedora
Affected: Fedora Extra Packages for Enterprise Linux
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/security/cve/CVE-2023-3354 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2216478 patch issue tracking
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MURWGXDIF2WTDXV36T6HFJDBL632AO7R/ mailing list
https://lists.debian.org/debian-lts-announce/2024/03/msg00012.html

Frequently Asked Questions

What is the severity of CVE-2023-3354?
CVE-2023-3354 has been scored as a high severity vulnerability.
How to fix CVE-2023-3354?
To fix CVE-2023-3354, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-3354 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-3354 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-3354?
CVE-2023-3354 affects n/a qemu, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat OpenStack Platform 13 (Queens), Fedora Fedora, Fedora Extra Packages for Enterprise Linux.
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