CVE-2016-9942

Debian Security Advisory 3753-1

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.

Desbordamiento de búfer basado en memoria dinámica en ultra.c en LibVNCClient en LibVNCServer en versiones anteriores a 0.9.11 permite a servidores remotos provocar una denegación de servicio (caída de aplicación) o posiblemente ejecutar código arbitrario a través de un mensaje FramebufferUpdate manipulado con el título de tipo Ultra, de manera que la longitud de la carga útil LZO descomprimida excede lo especificado por las dimensiones del azulejo.

It was discovered that libvncserver, a collection of libraries used to implement VNC/RFB clients and servers, incorrectly processed incoming network packets. This resulted in several heap-based buffer overflows, allowing a rogue server to either cause a DoS by crashing the client, or potentially execute arbitrary code on the client side.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-12-13 CVE Reserved
2016-12-31 CVE Published
2024-08-06 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

CAPEC

References (7)

URL	Tag	Source
http://www.securityfocus.com/bid/95170	Vdb Entry
https://github.com/LibVNC/libvncserver/pull/137	X_refsource_confirm
https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11	X_refsource_confirm
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3753	2020-10-23
https://security.gentoo.org/glsa/201702-24	2020-10-23
https://usn.ubuntu.com/4587-1	2020-10-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libvncserver Project Search vendor "Libvncserver Project"		Libvncserver Search vendor "Libvncserver Project" for product "Libvncserver"				0.9.10 Search vendor "Libvncserver Project" for product "Libvncserver" and version "0.9.10"		-		Affected