// For flags

CVE-2019-19581

 

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An issue was discovered in Xen through 4.12.x allowing 32-bit Arm guest OS users to cause a denial of service (out-of-bounds access) 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 32-bit Arm accesses to bitmaps with bit a count which is a multiple of 32, an out of bounds access may occur. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. 32-bit Arm systems are vulnerable. 64-bit Arm systems are not vulnerable.

Se detectó un problema en Xen versiones hasta 4.12.x, que permite a usuarios del Sistema Operativo invitado Arm de 32 bits causar una denegación de servicio (acceso fuera de límites) porque maneja inapropiadamente cierta iteración de bits. En varios lugares, el hipervisor está utilizando mapas de bits para rastrear cierto estado. La iteración sobre todos los bits implica funciones que pueden comportarse inapropiadamente en determinados casos de esquina: en el acceso Arm de 32 bits a mapas de bits con un recuento de bits que es un múltiplo de 32, puede ocurrir un acceso fuera de límites. Un invitado malicioso puede provocar un bloqueo o bloqueo del hipervisor, resultando en una Denegación de Servicio (DoS). Todas las versiones de Xen son vulnerables. Los sistemas Arm de 32 bits son vulnerables. Los sistemas Arm de 64 bits no son vulnerables.

*Credits: N/A
CVSS Scores
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-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CAPEC
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