CVE-2017-7493

Gentoo Linux Security Advisory 201706-03

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing virtfs metadata files in mapped-file security mode. A guest user could use this flaw to escalate their privileges inside guest.

Quick Emulator (Qemu) integrado con VirtFS, con soporte para la compartición de directorios de host mediante Plan 9 File System(9pfs), es vulnerable a un problema de control de acceso incorrecto. Podría ocurrir mientras se accede a archivos de metadatos de virtfs en modo de seguridad mapped-file. Un usuario invitado podría emplear este error para escalar sus privilegios en el invitado.

USN-3414-1 fixed vulnerabilities in QEMU. The patch backport for CVE-2017-9375 was incomplete and caused a regression in the USB xHCI controller emulation support. This update fixes the problem. Leo Gaspard discovered that QEMU incorrectly handled VirtFS access control. A guest attacker could use this issue to elevate privileges inside the guest. Li Qiang discovered that QEMU incorrectly handled VMWare PVSCSI emulation. A privileged attacker inside the guest could use this issue to cause QEMU to consume resources or crash, resulting in a denial of service. Various other issues were also addressed.

*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

2017-04-05 CVE Reserved
2017-05-17 CVE Published
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-732: Incorrect Permission Assignment for Critical Resource

CAPEC

References (6)

URL	Tag	Source
http://www.securityfocus.com/bid/98574	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html	Mailing List

URL	Date	SRC

URL	Date	SRC
http://seclists.org/oss-sec/2017/q2/278	2020-10-23
https://bugzilla.redhat.com/show_bug.cgi?id=1451709	2020-10-23
https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg03663.html	2020-10-23

URL	Date	SRC
https://security.gentoo.org/glsa/201706-03	2020-10-23

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"				<= 2.9.1 Search vendor "Qemu" for product "Qemu" and version " <= 2.9.1"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected