CVE-2018-12893

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.

Se ha descubierto un problema en Xen hasta las versiones 4.10.x. Una de las correcciones en XSA-260 agregó algunas comprobaciones de seguridad para ayudar a evitar el livelocking de Xen con excepciones de depuración. Desafortunadamente, debido a un descuido, al menos uno de estos controles de seguridad puede ser activado por un invitado. Un invitado PV malicioso puede bloquear Xen, lo que conduce a una denegación de servicio (DoS). Todos los sistemas Xen que han aplicado la corrección XSA-260 son vulnerables. Sólo los sistemas x86 son vulnerables. Los sistemas ARM no son vulnerables. Sólo los invitados PV x86 pueden explotar la vulnerabilidad. Los invitados HVM y PVH x86 no pueden explotar la vulnerabilidad. Un atacante necesita ser capaz de controlar las instalaciones de depuración de hardware para explotar la vulnerabilidad, pero estos permisos suelen estar disponibles para usuarios no privilegiados.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-06-26 CVE Reserved
2018-06-29 CVE Published
2023-06-26 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (9)

URL	Tag	Source
http://www.securityfocus.com/bid/104572	Third Party Advisory
http://www.securitytracker.com/id/1041202	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1590979	Issue Tracking
https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html	Mailing List

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2018/06/27/11	2019-10-03
http://xenbits.xen.org/xsa/advisory-265.html	2019-10-03

URL	Date	SRC
https://security.gentoo.org/glsa/201810-06	2019-10-03
https://support.citrix.com/article/CTX235748	2019-10-03
https://www.debian.org/security/2018/dsa-4236	2019-10-03

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"				<= 4.10.0 Search vendor "Xen" for product "Xen" and version " <= 4.10.0"		x86		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected