// For flags

CVE-2023-34058

open-vm-tools: SAML token signature bypass

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

< 1%
*EPSS

Affected Versions

8
*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

VMware Tools contains a SAML token signature bypass vulnerability. A malicious actor that has been granted Guest Operation Privileges https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-security/GUID-6A952214-0E5E-4CCF-9D2A-90948FF643EC.html in a target virtual machine may be able to elevate their privileges if that target virtual machine has been assigned a more privileged Guest Alias https://vdc-download.vmware.com/vmwb-repository/dcr-public/d1902b0e-d479-46bf-8ac9-cee0e31e8ec0/07ce8dbd-db48-4261-9b8f-c6d3ad8ba472/vim.vm.guest.AliasManager.html .

VMware Tools contiene una vulnerabilidad de omisión de firma de token SAML. Un actor malicioso al que se le han otorgado privilegios de operación de invitado https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-security/GUID-6A952214-0E5E-4CCF-9D2A-90948FF643EC.html en una máquina virtual de destino es posible que pueda elevar sus privilegios si a esa máquina virtual de destino se le ha asignado un Alias de Invitado más privilegiado https://vdc-download.vmware.com/vmwb-repository/dcr-public/d1902b0e-d479-46bf-8ac9-cee0e31e8ec0/07ce8dbd-db48-4261-9b8f-c6d3ad8ba472/vim.vm.guest.AliasManager.html.

A flaw was found in open-vm-tools. This flaw allows a malicious actor that has been granted Guest Operation Privileges in a target virtual machine to elevate their privileges if that target virtual machine has been assigned a more privileged Guest Alias.

VMware Tools contains a SAML token signature bypass vulnerability. A malicious actor that has been granted Guest Operation Privileges https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-security/GUID-6A952214-0E5E-4CCF-9D2A-90948FF643EC.html in a target virtual machine may be able to elevate their privileges if that target virtual machine has been assigned a more privileged Guest Alias https://vdc-download.vmware.com/vmwb-repository/dcr-public/d1902b0e-d479-46bf-8ac9-cee0e31e8ec0/07ce8dbd-db48-4261-9b8f-c6d3ad8ba472/vim.vm.guest.AliasManager.html .

It was discovered that Open VM Tools incorrectly handled SAML tokens. A remote attacker Guest Operations privileges could possibly use this issue to escalate privileges. Matthias Gerstner discovered that Open VM Tools incorrectly handled file descriptors when dropping privileges. A local attacker could possibly use this issue to hijack /dev/uinput and simulate user inputs.

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Adjacent
Attack Complexity
High
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2023-05-25 CVE Reserved
  • 2023-10-27 CVE Published
  • 2025-03-06 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-347: Improper Verification of Cryptographic Signature
  • CWE-1220: Insufficient Granularity of Access Control
CAPEC
Affected Vendors, Products, and Versions (8)