CVE-2014-6053

libvncserver: server NULL pointer dereference flaw in ClientCutText message handling

Severity Score

5.0

*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 does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.

La función rfbProcessClientNormalMessage en libvncserver/rfbserver.c en LibVNCServer 0.9.9 y anteriores no maneja correctamente los intentos de enviar una cantidad grande de datos ClientCutText, lo que permite a atacantes remotos causar una denegación de servicio (consumo de memoria o caída del demonio) a través de un mensaje manipulado que está procesado mediante el uso de un único malloc no comprobado.

A NULL pointer dereference flaw was found in the way LibVNCServer handled certain ClientCutText message. A remote attacker could use this flaw to crash the VNC server by sending a specially crafted ClientCutText message from a VNC client.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

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
2024-07-27 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-19: Data Processing Errors
CWE-476: NULL Pointer Dereference

CAPEC

References (17)

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
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/11/msg00032.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://github.com/newsoft/libvncserver/commit/6037a9074d52b1963c97cb28ea1096c7c14cbf28	2020-10-23

URL	Date	SRC
http://lists.opensuse.org/opensuse-updates/2015-12/msg00022.html	2020-10-23
http://ubuntu.com/usn/usn-2365-1	2020-10-23
http://www.debian.org/security/2014/dsa-3081	2020-10-23
https://security.gentoo.org/glsa/201507-07	2020-10-23
https://usn.ubuntu.com/4573-1	2020-10-23
https://usn.ubuntu.com/4587-1	2020-10-23
https://access.redhat.com/security/cve/CVE-2014-6053	2014-11-11
https://bugzilla.redhat.com/show_bug.cgi?id=1144289	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
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
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