CVE-2014-6054

libvncserver: server divide-by-zero flaw in scaling factor handling

Severity Score

4.3

*CVSS v2

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier allows remote attackers to cause a denial of service (divide-by-zero error and server crash) via a zero value in the scaling factor in a (1) PalmVNCSetScaleFactor or (2) SetScale message.

La función rfbProcessClientNormalMessage en libvncserver/rfbserver.c en LibVNCServer 0.9.9 y anteriores permite a atacantes remotos causar una denegación de servicio (error de la división por cero y caída del servidor) a través de un valor cero en el factor de escalado en un mensaje (1) PalmVNCSetScaleFactor o (2) SetScale.

A divide-by-zero flaw was found in the way LibVNCServer handled the scaling factor when it was set to "0". A remote attacker could use this flaw to crash the VNC server using a malicious VNC client.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2014-09-01 CVE Reserved
2014-09-25 CVE Published
2024-08-06 CVE Updated
2024-11-22 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-189: Numeric Errors
CWE-369: Divide By Zero

CAPEC

References (15)

URL	Tag	Source
http://seclists.org/oss-sec/2014/q3/639	Mailing List
http://secunia.com/advisories/61506	Third Party Advisory
http://secunia.com/advisories/61682	Third Party Advisory
http://www.ocert.org/advisories/ocert-2014-007.html	Third Party Advisory
http://www.openwall.com/lists/oss-security/2014/09/25/11	Mailing List
http://www.securityfocus.com/bid/70094	Vdb Entry
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://github.com/newsoft/libvncserver/commit/05a9bd41a8ec0a9d580a8f420f41718bdd235446	2020-10-23

URL	Date	SRC
http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html	2020-10-23
http://www.debian.org/security/2014/dsa-3081	2020-10-23
http://www.ubuntu.com/usn/USN-2365-1	2020-10-23
https://security.gentoo.org/glsa/201507-07	2020-10-23
https://usn.ubuntu.com/4587-1	2020-10-23
https://access.redhat.com/security/cve/CVE-2014-6054	2014-11-11
https://bugzilla.redhat.com/show_bug.cgi?id=1144291	2014-11-11

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libvncserver Search vendor "Libvncserver"		Libvncserver Search vendor "Libvncserver" for product "Libvncserver"				<= 0.9.9 Search vendor "Libvncserver" for product "Libvncserver" and version " <= 0.9.9"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected