RHSA-2023:5313

Vulnerability from csaf_redhat - Published: 2023-09-20 16:46 - Updated: 2026-03-18 02:25
Summary
Red Hat Security Advisory: open-vm-tools security update
Severity
Important
Notes
Topic: An update for open-vm-tools is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The Open Virtual Machine Tools are the open source implementation of the VMware Tools. They are a set of guest operating system virtualization components that enhance performance and user experience of virtual machines. Security Fix(es): * open-vm-tools: SAML token signature bypass (CVE-2023-20900) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2023-20900

An improper signature verification flaw was found in open-vm-tools that may lead to a bypass of SAML token signature. A malicious actor that has been granted Guest Operation Privileges 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.

7.1 (High)
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-347 - Improper Verification of Cryptographic Signature
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2023:5313
References
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        "id": "CWE-347",
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      "discovery_date": "2023-08-31T00:00:00+00:00",
      "ids": [
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          "text": "2236542"
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          "category": "description",
          "text": "An improper signature verification flaw was found in open-vm-tools that may lead to a bypass of SAML token signature. A malicious actor that has been granted Guest Operation Privileges 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "open-vm-tools: SAML token signature bypass",
          "title": "Vulnerability summary"
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        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        {
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      ],
      "title": "open-vm-tools: SAML token signature bypass"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.