CVE-2019-19582

Severity Score

6.5

*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 Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable.

Se detectó un problema en Xen versiones hasta 4.12.x, permitiendo a usuarios invitados del sistema operativo x86 causar una denegación de servicio (bucle infinito) porque es manejada inapropiadamente cierta iteración de bits. En varios lugares, el hipervisor está usando mapas de bits para rastrear cierto estado. La iteración sobre todos los bits implica funciones que pueden comportarse inapropiadamente en ciertos casos de esquina: en x86, los accesos a mapas de bits con un tiempo de compilación de un tamaño conocido de 64 pueden provocar un comportamiento indefinido, lo que en particular puede dar como resultado bucles infinitos. Un invitado malicioso puede provocar un bloqueo o bloqueo del hipervisor, resulta en una Denegación de servicio (DoS). Todas las versiones de Xen son vulnerables. Los sistemas en x86 con 64 o más nodos son vulnerables (es posible que Xen no ejecute ninguno de esos sistemas). Los sistemas en x86 con menos de 64 nodos no son vulnerables.

*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

2019-12-04 CVE Reserved
2019-12-11 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (7)

URL	Tag	Source
https://seclists.org/bugtraq/2020/Jan/21	Mailing List

URL	Date	SRC

URL	Date	SRC
https://xenbits.xen.org/xsa/advisory-307.html	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/34HBFTYNMQMWIO2GGK7DB6KV4M6R5YPV	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D5R73AYE53QA32KTMHUVKCX6E52CIS43	2023-11-07
https://security.gentoo.org/glsa/202003-56	2023-11-07
https://www.debian.org/security/2020/dsa-4602	2023-11-07

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"				>= 4.8.0 <= 4.12.1 Search vendor "Xen" for product "Xen" and version " >= 4.8.0 <= 4.12.1"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected