CVE-2023-3255

Qemu: vnc: infinite loop in inflate_buffer() leads to denial of service

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.

Se encontró una falla en el servidor VNC integrado de QEMU al procesar mensajes ClientCutText. Una condición de salida incorrecta puede provocar un bucle infinito al inflar un búfer zlib controlado por un atacante en la función `inflate_buffer`. Esto podría permitir que un cliente remoto autenticado que pueda enviar un portapapeles al servidor VNC active una denegación de servicio.

*Credits: Red Hat would like to thank Kevin Denis (Synacktiv) for reporting this issue.

CVSS Scores

NISTv3.1 6.5

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-06-14 CVE Reserved
2023-09-13 CVE Published
2024-09-19 EPSS Updated
2024-11-15 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (5)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20231020-0008	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=2218486	2024-05-22

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2024:2135	2024-05-22
https://access.redhat.com/errata/RHSA-2024:2962	2024-05-22
https://access.redhat.com/security/cve/CVE-2023-3255	2024-05-22

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qemu Search vendor "Qemu"		Qemu Search vendor "Qemu" for product "Qemu"				<= 8.0.3 Search vendor "Qemu" for product "Qemu" and version " <= 8.0.3"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				38 Search vendor "Fedoraproject" for product "Fedora" and version "38"		-		Affected