QEMU up to 2.14.2 VNC Server input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability was found in QEMU up to 2.14.2. It has been declared as problematic. This issue affects some unknown processing of the component VNC Server. Executing a manipulation can lead to input validation. The identification of this vulnerability is CVE-2017-15124. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in QEMU up to 2.14.2 (Virtualization Software). It has been declared as problematic. This vulnerability affects some unknown processing of the component VNC 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. CVE summarizes:

VNC server implementation in Quick Emulator (QEMU) before 2.14.3 was found to be vulnerable to an unbounded memory allocation issue, as it did not throttle the framebuffer updates sent to its client. If the client did not consume these updates, VNC server allocates growing memory to hold onto this data. A malicious remote VNC client could use this flaw to cause DoS to the server host.

The bug was discovered 12/12/2017. The weakness was shared 01/09/2018 as Bug 1525195 as confirmed bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability was named CVE-2017-15124 since 10/08/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 28 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 106927 (Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : qemu vulnerabilities (USN-3575-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157870 (Oracle Enterprise Linux Security Update for qemu (ELSA-2018-4285)).

Upgrading to version 2.14.3 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (106927) and SecurityFocus (BID 100540†). The entries VDB-104779, VDB-104780, VDB-105675 and VDB-105918 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 106927
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 17.10 : qemu vulnerabilities (USN-3575-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 870089
OpenVAS Name: Ubuntu Update for qemu USN-3575-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: QEMU 2.14.3

Timelineinfo

08/30/2017 🔍
10/08/2017 +39 days 🔍
12/12/2017 +65 days 🔍
01/09/2018 +28 days 🔍
01/09/2018 +0 days 🔍
01/10/2018 +1 days 🔍
02/20/2018 +41 days 🔍
02/21/2018 +1 days 🔍
01/29/2021 +1073 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: Bug 1525195
Researcher: David Buchanan
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-15124 (🔍)
GCVE (CVE): GCVE-0-2017-15124
GCVE (VulDB): GCVE-100-111544

OVAL: 🔍

SecurityFocus: 100540 - QEMU 'hw/display/vga.c' Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 01/10/2018 14:13
Updated: 01/29/2021 10:59
Changes: 01/10/2018 14:13 (78), 12/20/2019 19:15 (6), 01/29/2021 10:59 (3)
Complete: 🔍
Cache ID: 216::103

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