qemu: CVE-2023-6683: ui/clipboard: avoid crash upon request when clipboard peer is no

Debian Bug report logs - #1060749
qemu: CVE-2023-6683: ui/clipboard: avoid crash upon request when clipboard peer is no

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: qemu: CVE-2023-6683: ui/clipboard: avoid crash upon request when clipboard peer is no

Date: Sat, 13 Jan 2024 17:27:08 +0100

Source: qemu
Version: 1:8.2.0+ds-4
Severity: important
Tags: security upstream
Forwarded: https://lists.nongnu.org/archive/html/qemu-devel/2024-01/msg02382.html
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for qemu.

CVE-2023-6683[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2023-6683
    https://www.cve.org/CVERecord?id=CVE-2023-6683
[1] https://lists.nongnu.org/archive/html/qemu-devel/2024-01/msg02382.html

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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