CVE-2019-20175

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

An issue was discovered in ide_dma_cb() in hw/ide/core.c in QEMU 2.4.0 through 4.2.0. The guest system can crash the QEMU process in the host system via a special SCSI_IOCTL_SEND_COMMAND. It hits an assertion that implies that the size of successful DMA transfers there must be a multiple of 512 (the size of a sector). NOTE: a member of the QEMU security team disputes the significance of this issue because a "privileged guest user has many ways to cause similar DoS effect, without triggering this assert.

** EN DISPUTA ** Se descubrió un problema en la función ide_dma_cb() en el archivo hw/ide/core.c en QEMU versiones 2.4.0 hasta la versión 4.2.0. El sistema invitado puede bloquear el proceso de QEMU en el sistema host por medio de un SCSI_IOCTL_SEND_COMMAND especial. Llega a una afirmación que implica que el tamaño de las transferencias DMA con éxito debe ser un múltiplo de 512 (el tamaño de un sector). NOTA: un miembro del equipo de seguridad de QEMU cuestiona la relevancia de este problema ya que un "usuario invitado privilegiado cuenta con muchas formas de causar un efecto de DoS similar, sin activar esta afirmación".

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2019-12-31 CVE Reserved
2019-12-31 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-754: Improper Check for Unusual or Exceptional Conditions

CAPEC

References (5)

URL	Tag	Source
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg03869.html	Mailing List
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg00597.html	Third Party Advisory
https://www.mail-archive.com/qemu-devel%40nongnu.org/msg667396.html	X_refsource_misc

URL	Date	SRC
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg01651.html	2024-08-05

URL	Date	SRC
https://lists.nongnu.org/archive/html/qemu-devel/2019-11/msg02165.html	2024-06-26

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qemu Search vendor "Qemu"		Qemu Search vendor "Qemu" for product "Qemu"				>= 2.4.0 <= 4.2.0 Search vendor "Qemu" for product "Qemu" and version " >= 2.4.0 <= 4.2.0"		-		Affected