VMware ESXi/Workstation/Fusion VNC Session memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in VMware ESXi, Workstation and Fusion. This affects an unknown part of the component VNC Session Handler. Performing a manipulation results in memory corruption. This vulnerability is reported as CVE-2017-4941. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in VMware ESXi, Workstation and Fusion (Virtualization Software) (affected version unknown). This affects an unknown functionality of the component VNC Session Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

VMware ESXi (6.0 before ESXi600-201711101-SG, 5.5 ESXi550-201709101-SG), Workstation (12.x before 12.5.8), and Fusion (8.x before 8.5.9) contain a vulnerability that could allow an authenticated VNC session to cause a stack overflow via a specific set of VNC packets. Successful exploitation of this issue could result in remote code execution in a virtual machine via the authenticated VNC session. Note: In order for exploitation to be possible in ESXi, VNC must be manually enabled in a virtual machine's .vmx configuration file. In addition, ESXi must be configured to allow VNC traffic through the built-in firewall.

The bug was discovered 12/19/2017. The weakness was disclosed 12/20/2017 by Jann Horn (Mike) with Google Project Zero (Website). The advisory is shared at vmware.com. This vulnerability is uniquely identified as CVE-2017-4941 since 12/26/2016. It is possible to initiate the attack remotely. The successful exploitation needs a authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 105485 (VMware Fusion 8.x < 8.5.9 Multiple Vulnerabilities (VMSA-2017-0021) (VMSA-2018-0002) (Spectre) (macOS)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 216139 (VMware ESXi 5.5 Patch Release ESXi550-201709101-SG, ESXi550-201709102-SG Missing (KB 2150882)(Spectre)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (105485) and SecurityFocus (BID 102371†). The entries VDB-110935, VDB-110936, VDB-110938 and VDB-111326 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.7

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
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: Memory corruption
CWE: CWE-119
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: 105485
Nessus Name: VMware Fusion 8.x < 8.5.9 Multiple Vulnerabilities (VMSA-2017-0021) (VMSA-2018-0002) (Spectre) (macOS)
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: 🔍

Timelineinfo

12/26/2016 🔍
12/19/2017 +358 days 🔍
12/19/2017 +0 days 🔍
12/20/2017 +1 days 🔍
12/20/2017 +0 days 🔍
12/21/2017 +1 days 🔍
12/29/2017 +8 days 🔍
01/03/2018 +5 days 🔍
01/27/2021 +1120 days 🔍

Sourcesinfo

Vendor: vmware.com

Advisory: vmware.com
Researcher: Jann Horn (Mike)
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-4941 (🔍)
GCVE (CVE): GCVE-0-2017-4941
GCVE (VulDB): GCVE-100-110937
SecurityFocus: 102371 - Multiple CPU Hardware CVE-2017-5753 Information Disclosure Vulnerability
SecurityTracker: 1040024

scip Labs: https://www.scip.ch/en/?labs.20060413
See also: 🔍

Entryinfo

Created: 12/21/2017 08:04
Updated: 01/27/2021 17:16
Changes: 12/21/2017 08:04 (67), 12/17/2019 08:39 (9), 01/27/2021 17:16 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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