CVE-2017-12855

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected.

Xen mantiene los bits _GTF_{read,writ}ing como apropiados para informar al invitado de que se está empleando una sentencia grant. Se espera que el invitado no modifique los detalles de la sentencia grant mientras se está utilizando, aunque puede modificar/reusar la entrada grant cuando no está en uso. Bajo algunas circunstancias, Xen limpiará los bits de estado demasiado pronto, informando al invitado de forma incorrecta que la sentencia grant ya no se está utilizando. Un invitado podría creer prematuramente que un marco de concesión vuelve a ser privado de forma segura y reutilizarlo de forma que contenga información sensible, mientras que el dominio en el extremo de la sentencia grant sigue utilizándola. Xen 4.9, 4.8, 4.7, 4.6, y 4.5 se han visto afectadas.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-08-15 CVE Reserved
2017-08-15 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CAPEC

References (5)

URL	Tag	Source
http://www.securityfocus.com/bid/100341	Third Party Advisory
http://www.securitytracker.com/id/1039177	Third Party Advisory
https://support.citrix.com/article/CTX225941	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3969	2017-11-15
http://xenbits.xen.org/xsa/advisory-230.html	2017-11-15

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"				4.5.0 Search vendor "Xen" for product "Xen" and version "4.5.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.5.1 Search vendor "Xen" for product "Xen" and version "4.5.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.5.2 Search vendor "Xen" for product "Xen" and version "4.5.2"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.5.3 Search vendor "Xen" for product "Xen" and version "4.5.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.5.5 Search vendor "Xen" for product "Xen" and version "4.5.5"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.6.0 Search vendor "Xen" for product "Xen" and version "4.6.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.6.1 Search vendor "Xen" for product "Xen" and version "4.6.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.6.3 Search vendor "Xen" for product "Xen" and version "4.6.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.6.4 Search vendor "Xen" for product "Xen" and version "4.6.4"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.6.5 Search vendor "Xen" for product "Xen" and version "4.6.5"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.6.6 Search vendor "Xen" for product "Xen" and version "4.6.6"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.7.0 Search vendor "Xen" for product "Xen" and version "4.7.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.7.1 Search vendor "Xen" for product "Xen" and version "4.7.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.7.2 Search vendor "Xen" for product "Xen" and version "4.7.2"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.7.3 Search vendor "Xen" for product "Xen" and version "4.7.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.8.0 Search vendor "Xen" for product "Xen" and version "4.8.0"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.8.1 Search vendor "Xen" for product "Xen" and version "4.8.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.9.0 Search vendor "Xen" for product "Xen" and version "4.9.0"		-		Affected