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CVE-2023-20867: VMware Tools Authentication Bypass Vulnerability

criticalknown exploitedCVE-2023-20867
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
VMware Tools contains an authentication bypass vulnerability in the vgauth module. A fully compromised ESXi host can force VMware Tools to fail to authenticate host-to-guest operations, impacting the confidentiality and integrity of the guest virtual machine. An attacker must have root access over ESXi to exploit this vulnerability.

CSIRTS triage

vendor: VMwareproduct: VMware ToolsAuthentication bypass
What
An authentication bypass vulnerability in the vgauth module can impact the confidentiality and integrity of guest virtual machines.
Who is affected
Deployments of VMware Tools on fully compromised ESXi hosts.
Urgency
Remediation is urgent as the vulnerability is critical and actively exploited.
Action
Apply the latest security updates for VMware Tools.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-06-23
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-20867

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-20867coverage & exploitation statusNVD · CVE.org

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