CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	0.00

A vulnerability was found in QEMU up to 2.10.0 (Virtualization Software). It has been declared as problematic. Affected by this vulnerability is an unknown part of the component NBD Server. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

An assertion-failure flaw was found in Qemu before 2.10.1, in the Network Block Device (NBD) server's initial connection negotiation, where the I/O coroutine was undefined. This could crash the qemu-nbd server if a client sent unexpected data during connection negotiation. A remote user or process could use this flaw to crash the qemu-nbd server resulting in denial of service.

The bug was discovered 07/18/2018. The weakness was shared 07/26/2018 by Prasad J Pandit with Red Hat (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2017-7539 since 04/05/2017. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 103040 (RHEL 7 : qemu-kvm-rhev (RHSA-2017:2628)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 236581 (Red Hat Update for qemu-kvm-rhev (RHSA-2017:3474)).

Upgrading to version 2.10.1 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (103040) and SecurityFocus (BID 99944†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Virtualization Software

Name

• QEMU

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 6.0

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 103040
Nessus Name: RHEL 7 : qemu-kvm-rhev (RHSA-2017:2628)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: QEMU 2.10.1
Patch: 2b0bbc4f8809c972bad134bc1a2570dbb01dea0b

Timelineinfo

04/05/2017 🔍
07/21/2017 +107 days 🔍
09/05/2017 +45 days 🔍
09/08/2017 +3 days 🔍
07/18/2018 +313 days 🔍
07/26/2018 +7 days 🔍
07/26/2018 +0 days 🔍
07/26/2018 +0 days 🔍
04/25/2023 +1734 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: RHSA-2017:2628
Researcher: Prasad J Pandit
Organization: Red Hat
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-7539 (🔍)
GCVE (CVE): GCVE-0-2017-7539
GCVE (VulDB): GCVE-100-122209
SecurityFocus: 99944 - QEMU CVE-2017-7539 Denial of Service Vulnerability

Entryinfo

Created: 07/26/2018 08:04 PM
Updated: 04/25/2023 07:38 PM
Changes: 07/26/2018 08:04 PM (70), 03/10/2020 01:22 PM (5), 04/25/2023 07:30 PM (5), 04/25/2023 07:38 PM (12)
Complete: 🔍
Cache ID: 18:B3E:40

Discussion

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