CVE-2023-6683
published 2024-01-12CVE-2023-6683: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before…
PriorityP433medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
1.26%
66.3th percentile
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.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | qemu | < qemu 1:7.2+dfsg-7+deb12u4 (bookworm) | qemu 1:7.2+dfsg-7+deb12u4 (bookworm) |
| msrc | azl3_qemu_8.2.0-13_on_azure_linux_3.0 | — | — |
| msrc | azl3_qemu_8.2.0-16_on_azure_linux_3.0 | — | — |
| msrc | cbl2_qemu_6.2.0-21_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_qemu_6.2.0-24_on_cbl_mariner_2.0 | — | — |
| qemu | qemu | >= 0 < 1:7.2+dfsg-7+deb12u4 | 1:7.2+dfsg-7+deb12u4 |
| qemu | qemu | >= 0 < 1:8.2.0+ds-5 | 1:8.2.0+ds-5 |
| qemu | qemu | >= 0 < 1:8.2.0+ds-5 | 1:8.2.0+ds-5 |
| qemu | qemu | >= 0 < 1:6.2+dfsg-2ubuntu6.22 | 1:6.2+dfsg-2ubuntu6.22 |
| qemu | qemu | >= 6.1.0 < 8.2.2 | 8.2.2 |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv6.5MEDIUM
vendor_debian6.5MEDIUM
vendor_msrc6.5MEDIUM
vendor_redhat6.5MEDIUM
vendor_ubuntu6.5MEDIUM
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OSV
qemu vulnerabilities
osv·2024-08-13·CVSS 6.5
CVE-2023-6683 [MEDIUM] qemu vulnerabilities
qemu vulnerabilities
Markus Frank and Fiona Ebner discovered that QEMU did not properly
handle certain memory operations, leading to a NULL pointer dereference.
An authenticated user could potentially use this issue to cause a denial
of service. (CVE-2023-6683)
Xiao Lei discovered that QEMU did not properly handle certain memory
operations when specific features were enabled, which could lead to a
stack overflow. An attacker could potentially use this issue to leak
sensitive information. (CVE-2023-6693)
It was discovered that QEMU had an integer underflow vulnerability in
the TI command, which would result in a buffer overflow. An attacker
could potentially use this issue to cause a denial of service.
(CVE-2024-24474)
GHSA
GHSA-x9c6-9g9w-hg73: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages
ghsa_unreviewed·2024-01-12
CVE-2023-6683 [MEDIUM] CWE-476 GHSA-x9c6-9g9w-hg73: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages
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.
OSV
CVE-2023-6683: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages
osv·2024-01-12·CVSS 6.5
CVE-2023-6683 [MEDIUM] CVE-2023-6683: A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages
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.
Ubuntu
QEMU vulnerabilities
vendor_ubuntu·2024-08-13·CVSS 6.5
CVE-2023-6693 [MEDIUM] QEMU vulnerabilities
Title: QEMU vulnerabilities
Summary: Several security issues were fixed in QEMU.
Markus Frank and Fiona Ebner discovered that QEMU did not properly
handle certain memory operations, leading to a NULL pointer dereference.
An authenticated user could potentially use this issue to cause a denial
of service. (CVE-2023-6683)
Xiao Lei discovered that QEMU did not properly handle certain memory
operations when specific features were enabled, which could lead to a
stack overflow. An attacker could potentially use this issue to leak
sensitive information. (CVE-2023-6693)
It was discovered that QEMU had an integer underflow vulnerability in
the TI command, which would result in a buffer overflow. An attacker
could potentially use this issue to cause a denial of service.
(CVE-2024-24474)
Instruc
Red Hat
QEMU: VNC: NULL pointer dereference in qemu_clipboard_request()
vendor_redhat·2024-01-12·CVSS 6.5
CVE-2023-6683 [MEDIUM] CWE-476 QEMU: VNC: NULL pointer dereference in qemu_clipboard_request()
QEMU: VNC: NULL pointer dereference in qemu_clipboard_request()
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.
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 t
Microsoft
Qemu: vnc: null pointer dereference in qemu_clipboard_request()
vendor_msrc·2024-01-09·CVSS 6.5
CVE-2023-6683 [MEDIUM] CWE-476 Qemu: vnc: null pointer dereference in qemu_clipboard_request()
Qemu: vnc: null pointer dereference in qemu_clipboard_request()
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
redhat: redhat
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: htt
Debian
CVE-2023-6683: qemu - A flaw was found in the QEMU built-in VNC server while processing ClientCutText ...
vendor_debian·2023·CVSS 6.5
CVE-2023-6683 [MEDIUM] CVE-2023-6683: qemu - A flaw was found in the QEMU built-in VNC server while processing ClientCutText ...
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.
Scope: local
bookworm: resolved (fixed in 1:7.2+dfsg-7+deb12u4)
bullseye: resolved
forky: resolved (fixed in 1:8.2.0+ds-5)
sid: resolved (fixed in 1:8.2.0+ds-5)
trixie: resolved (fixed in 1:8.2.0+ds-5)
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://access.redhat.com/errata/RHSA-2024:2135https://access.redhat.com/errata/RHSA-2024:2962https://access.redhat.com/security/cve/CVE-2023-6683https://bugzilla.redhat.com/show_bug.cgi?id=2254825https://access.redhat.com/errata/RHSA-2024:2135https://access.redhat.com/errata/RHSA-2024:2962https://access.redhat.com/security/cve/CVE-2023-6683https://bugzilla.redhat.com/show_bug.cgi?id=2254825https://security.netapp.com/advisory/ntap-20240223-0001/
2024-01-12
Published