CVE-2023-6683 — NULL Pointer Dereference in Qemu

CWE-476 — NULL Pointer Dereference9 documents8 sources
Severity
6.5MEDIUMNVD
EPSS
0.1%
top 79.25%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
QemuRedhat Enterprise Linux
Timeline
PublishedJan 12
Latest updateAug 13

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages3 packages

▶NVDqemu/qemu6.1.0 — 8.2.2
▶Debianqemu/qemu< 1:7.2+dfsg-7+deb12u4+2
▶Ubuntuqemu/qemu< 1:6.2+dfsg-2ubuntu6.22

Also affects: Enterprise Linux 8.0, 9.0

Patches

Patch: bugzilla.redhat.com ↗Patch: bugzilla.redhat.com ↗

🔴Vulnerability Details

4
OSV
qemu vulnerabilities↗2024-08-13
▶
CVEList
Qemu: vnc: null pointer dereference in qemu_clipboard_request()↗2024-01-12
▶
GHSA
GHSA-x9c6-9g9w-hg73: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages↗2024-01-12
▶
OSV
CVE-2023-6683: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages↗2024-01-12
▶

📋Vendor Advisories

4
Ubuntu
QEMU vulnerabilities↗2024-08-13
▶
Red Hat
QEMU: VNC: NULL pointer dereference in qemu_clipboard_request()↗2024-01-12
▶
Microsoft
Qemu: vnc: null pointer dereference in qemu_clipboard_request()↗2024-01-09
▶
Debian
CVE-2023-6683: qemu - A flaw was found in the QEMU built-in VNC server while processing ClientCutText ...↗2023
▶
CVE-2023-6683 — NULL Pointer Dereference in Qemu | cvebase