CVE-2021-21987

VMware Workstation ThinPrint TTCHeader Out-Of-Bounds Read Information Disclosure Vulnerability

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

VMware Workstation (16.x prior to 16.1.2) and Horizon Client for Windows (5.x prior to 5.5.2) contain out-of-bounds read vulnerability in the Cortado ThinPrint component (TTC Parser). A malicious actor with access to a virtual machine or remote desktop may be able to exploit these issues leading to information disclosure from the TPView process running on the system where Workstation or Horizon Client for Windows is installed.

VMware Workstation (16.x versiones anteriores a 16.1.2) y Horizon Client para Windows (5.x versiones anteriores a 5.5.2) contienen una vulnerabilidad de lectura fuera de límites en el componente Cortado ThinPrint (TTC Parser). Un actor malicioso con acceso a una máquina virtual o escritorio remoto puede explotar estos problemas que conllevan a la divulgación de información del proceso TPView que se ejecuta en el sistema donde está instalado Workstation o Horizon Client para Windows

This vulnerability allows local attackers to disclose sensitive information on affected installations of VMware Workstation. An attacker must first obtain the ability to execute low-privileged code on the target guest system in order to exploit this vulnerability.
The specific flaw exists within the ThinPrint component. Crafted data in a font file can trigger a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the hypervisor.

*Credits: Anonymous

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-04 CVE Reserved
2021-05-24 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (2)

URL	Tag	Source
https://www.zerodayinitiative.com/advisories/ZDI-21-608	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://www.vmware.com/security/advisories/VMSA-2021-0009.html	2021-06-04

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Vmware Search vendor "Vmware"	Horizon Client Search vendor "Vmware" for product "Horizon Client"	>= 5.0.0 < 5.5.2 Search vendor "Vmware" for product "Horizon Client" and version " >= 5.0.0 < 5.5.2"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Vmware Search vendor "Vmware"		Workstation Search vendor "Vmware" for product "Workstation"				>= 16.0.0 < 16.1.2 Search vendor "Vmware" for product "Workstation" and version " >= 16.0.0 < 16.1.2"		-		Affected