CVE-2023-6683

Qemu: vnc: null pointer dereference in qemu_clipboard_request()

Description

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before vnc_server_cut_text_caps() was called and had the chance to initialize the clipboard peer, leading to a NULL pointer dereference. This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.

Remediation

Workaround:

  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.07%
Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
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 Advanced Virtualization
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:2135 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2024:2962 third party advisory vendor advisory
https://access.redhat.com/security/cve/CVE-2023-6683 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2254825 patch issue tracking
https://security.netapp.com/advisory/ntap-20240223-0001/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-6683?
CVE-2023-6683 has been scored as a medium severity vulnerability.
How to fix CVE-2023-6683?
As a workaround for remediating CVE-2023-6683: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Is CVE-2023-6683 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-6683 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-2023-6683?
CVE-2023-6683 affects Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9, 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 Advanced Virtualization.
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