CVE-2020-15852

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

Se detectó un problema en el kernel de Linux versiones 5.5 hasta 5.7.9, como es usado en Xen versiones hasta 4.13.x para invitados PV x86. Un atacante puede otorgar los permisos del puerto de I/O de una tarea no relacionada. Esto ocurre porque el manejo inapropiado de la función tss_invalidate_io_bitmap causa una pérdida de sincronización entre los mapas de bits de I/O de TSS y Xen, también se conoce como CID-cadfad870154

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-07-20 CVE Reserved
2020-07-20 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-276: Incorrect Default Permissions

CAPEC

References (5)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2020/07/21/2	Mailing List
https://security.netapp.com/advisory/ntap-20200810-0001	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://xenbits.xen.org/xsa/advisory-329.html	2022-12-03
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cadfad870154e14f745ec845708bc17d166065f2	2022-12-03
https://github.com/torvalds/linux/commit/cadfad870154e14f745ec845708bc17d166065f2	2022-12-03

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.5 <= 5.7.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 <= 5.7.9"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				<= 4.13.1 Search vendor "Xen" for product "Xen" and version " <= 4.13.1"		x86		Affected
Netapp Search vendor "Netapp"		Cloud Backup Search vendor "Netapp" for product "Cloud Backup"				-		-		Affected
Netapp Search vendor "Netapp"		Steelstore Cloud Integrated Storage Search vendor "Netapp" for product "Steelstore Cloud Integrated Storage"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire Baseboard Management Controller Search vendor "Netapp" for product "Solidfire Baseboard Management Controller"				-		-		Affected