VMware ESXi/Workstation/Fusion VNC Session memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in VMware ESXi, Workstation and Fusion. Affected by this vulnerability is an unknown functionality of the component VNC Session Handler. This manipulation causes memory corruption. This vulnerability is registered as CVE-2017-4933. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in VMware ESXi, Workstation and Fusion (Virtualization Software) (version now known). Affected by this vulnerability is some unknown processing of the component VNC Session Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

VMware ESXi (6.5 before ESXi650-201710401-BG), 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 heap overflow via a specific set of VNC packets resulting in heap corruption. 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 published 12/20/2017 (Website). It is possible to read the advisory at vmware.com. This vulnerability is known as CVE-2017-4933 since 12/26/2016. The attack can be launched remotely. Required for exploitation is a single authentication. The technical details are unknown and an exploit is not 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 370662 (VMware Workstation and Fusion Multiple Vulnerabilities (VMSA-2017-0018,VMSA-2017-0021,VMSA-2018-0002)).

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 vulnerability database at Tenable (105485). Similar entries are available at VDB-109670, VDB-109671, VDB-109672 and VDB-109673. Be aware that VulDB is the high quality source for 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 🔍
01/18/2023 +1846 days 🔍

Sourcesinfo

Vendor: vmware.com

Advisory: vmware.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-4933 (🔍)
GCVE (CVE): GCVE-0-2017-4933
GCVE (VulDB): GCVE-100-110935
SecurityFocus: 102238
SecurityTracker: 1040024

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

Entryinfo

Created: 12/21/2017 08:04
Updated: 01/18/2023 14:23
Changes: 12/21/2017 08:04 (66), 12/17/2019 08:36 (4), 01/27/2021 17:04 (2), 01/18/2023 14:23 (3)
Complete: 🔍
Cache ID: 216::103

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