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CVE-2023-6683

Published: 12 January 2024

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.

Notes

AuthorNote
mdeslaur
as of 2024-04-15, the patch has not been committed upstream

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic Deferred
(2024-04-15)
focal Deferred
(2024-04-15)
jammy Deferred
(2024-04-15)
lunar Ignored
(end of life, was deferred [2024-04-15])
mantic Deferred
(2024-04-15)
trusty Deferred
(2024-04-15)
upstream Needs triage

xenial Deferred
(2024-04-15)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H