CVE-2017-9524

Qemu: nbd: segmentation fault due to client non-negotiation

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The qemu-nbd server in QEMU (aka Quick Emulator), when built with the Network Block Device (NBD) Server support, allows remote attackers to cause a denial of service (segmentation fault and server crash) by leveraging failure to ensure that all initialization occurs before talking to a client in the nbd_negotiate function.

El servidor qemu-nbd en QEMU (también se conoce como Quick Emulator), cuando se ensambló con el soporte del servidor Network Block Device (NBD), permite a los atacantes remotos causar una denegación de servicio (fallo de segmentación y fallo del servidor) aprovechando el fallo para garantizar que toda la inicialización ocurre antes de hablar con un cliente en la función nbd_negotiate.

Quick Emulator (QEMU) built with Network Block Device (NBD) Server support was vulnerable to a null-pointer dereference issue. The flaw could occur when releasing a client that was not initialized due to failed negotiation. A remote user or process could exploit this flaw to crash the qemu-nbd server (denial of service).

*Credits: N/A

CVSS Scores

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

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

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

2017-06-09 CVE Reserved
2017-07-05 CVE Published
2024-06-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-476: NULL Pointer Dereference

CAPEC

References (10)

URL	Tag	Source
http://www.securityfocus.com/bid/99011	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2017/06/12/1	2020-10-29
https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg06240.html	2020-10-29
https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg02321.html	2020-10-29

URL	Date	SRC
http://www.debian.org/security/2017/dsa-3925	2020-10-29
https://access.redhat.com/errata/RHSA-2017:1681	2020-10-29
https://access.redhat.com/errata/RHSA-2017:1682	2020-10-29
https://access.redhat.com/errata/RHSA-2017:2408	2020-10-29
https://access.redhat.com/security/cve/CVE-2017-9524	2017-08-01
https://bugzilla.redhat.com/show_bug.cgi?id=1460170	2017-08-01

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"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected