CVE-2014-4021

xen: Hypervisor heap contents leaked to guests (xsa-100)

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Xen 3.2.x through 4.4.x does not properly clean memory pages recovered from guests, which allows local guest OS users to obtain sensitive information via unspecified vectors.

Xen 3.2.x hasta 4.4.x no limpia debidamente las páginas de memoria recuperadas de invitados, lo que permite a usuarios locales del sistema operativo invitado obtener información sensible a través de vectores no especificados.

It was found that the Xen hypervisor implementation did not properly clean memory pages previously allocated by the hypervisor. A privileged guest user could potentially use this flaw to read data relating to other guests or the hypervisor itself.

The kernel packages contain the Linux kernel, the core of any Linux operating system. A NULL pointer dereference flaw was found in the rds_iw_laddr_check() function in the Linux kernel's implementation of Reliable Datagram Sockets. A local, unprivileged user could use this flaw to crash the system. It was found that the Xen hypervisor implementation did not properly clean memory pages previously allocated by the hypervisor. A privileged guest user could potentially use this flaw to read data relating to other guests or the hypervisor itself.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

Attack Vector

Adjacent

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2014-06-11 CVE Reserved
2014-06-18 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
CWE-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection')

CAPEC

References (18)

URL	Tag	Source
http://linux.oracle.com/errata/ELSA-2014-0926-1.html	X_refsource_confirm
http://linux.oracle.com/errata/ELSA-2014-0926.html	X_refsource_confirm
http://secunia.com/advisories/59208	Third Party Advisory
http://secunia.com/advisories/60027	Third Party Advisory
http://secunia.com/advisories/60130	Third Party Advisory
http://secunia.com/advisories/60471	Third Party Advisory
http://support.citrix.com/article/CTX140984	X_refsource_confirm
http://www.securityfocus.com/bid/68070	Vdb Entry
http://www.securitytracker.com/id/1030442	Vdb Entry

URL	Date	SRC

URL	Date	SRC
http://xenbits.xen.org/xsa/advisory-100.html	2018-10-30

URL	Date	SRC
http://lists.fedoraproject.org/pipermail/package-announce/2014-July/135068.html	2018-10-30
http://lists.fedoraproject.org/pipermail/package-announce/2014-July/135071.html	2018-10-30
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00002.html	2018-10-30
http://lists.opensuse.org/opensuse-security-announce/2014-10/msg00003.html	2018-10-30
http://security.gentoo.org/glsa/glsa-201407-03.xml	2018-10-30
http://www.debian.org/security/2014/dsa-3006	2018-10-30
https://access.redhat.com/security/cve/CVE-2014-4021	2014-07-23
https://bugzilla.redhat.com/show_bug.cgi?id=1103646	2014-07-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				3.2.0 Search vendor "Xen" for product "Xen" and version "3.2.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				3.2.1 Search vendor "Xen" for product "Xen" and version "3.2.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				3.2.2 Search vendor "Xen" for product "Xen" and version "3.2.2"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				3.2.3 Search vendor "Xen" for product "Xen" and version "3.2.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.0.0 Search vendor "Xen" for product "Xen" and version "4.0.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.0.1 Search vendor "Xen" for product "Xen" and version "4.0.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.0.2 Search vendor "Xen" for product "Xen" and version "4.0.2"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.0.3 Search vendor "Xen" for product "Xen" and version "4.0.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.0.4 Search vendor "Xen" for product "Xen" and version "4.0.4"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.1.0 Search vendor "Xen" for product "Xen" and version "4.1.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.1.1 Search vendor "Xen" for product "Xen" and version "4.1.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.1.2 Search vendor "Xen" for product "Xen" and version "4.1.2"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.1.3 Search vendor "Xen" for product "Xen" and version "4.1.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.1.4 Search vendor "Xen" for product "Xen" and version "4.1.4"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.1.5 Search vendor "Xen" for product "Xen" and version "4.1.5"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.1.6.1 Search vendor "Xen" for product "Xen" and version "4.1.6.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.2.0 Search vendor "Xen" for product "Xen" and version "4.2.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.2.1 Search vendor "Xen" for product "Xen" and version "4.2.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.2.2 Search vendor "Xen" for product "Xen" and version "4.2.2"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.2.3 Search vendor "Xen" for product "Xen" and version "4.2.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.3.0 Search vendor "Xen" for product "Xen" and version "4.3.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.3.1 Search vendor "Xen" for product "Xen" and version "4.3.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.4.0 Search vendor "Xen" for product "Xen" and version "4.4.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.4.0 Search vendor "Xen" for product "Xen" and version "4.4.0"		rc1		Affected