MSRC_CVE-2020-25637

Vulnerability from csaf_microsoft - Published: 2020-10-02 00:00 - Updated: 2021-12-16 00:00
Summary
A double free memory issue was found to occur in the libvirt API in versions before 6.8.0 responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon resulting in a denial of service or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Notes

Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
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{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
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    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2020-25637 A double free memory issue was found to occur in the libvirt API in versions before 6.8.0 responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon resulting in a denial of service or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2020/msrc_cve-2020-25637.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "A double free memory issue was found to occur in the libvirt API in versions before 6.8.0 responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon resulting in a denial of service or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
    "tracking": {
      "current_release_date": "2021-12-16T00:00:00.000Z",
      "generator": {
        "date": "2025-10-19T18:10:07.400Z",
        "engine": {
          "name": "MSRC Generator",
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      "initial_release_date": "2020-10-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2020-10-09T00:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2021-12-16T00:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added libvirt to CBL-Mariner 2.0"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "1.0",
                "product": {
                  "name": "CBL Mariner 1.0",
                  "product_id": "16820"
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              },
              {
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          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003ccm1 libvirt 6.1.0-2",
                "product": {
                  "name": "\u003ccm1 libvirt 6.1.0-2",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "cm1 libvirt 6.1.0-2",
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              },
              {
                "category": "product_version_range",
                "name": "\u003ccbl2 libvirt 6.1.0-4",
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              },
              {
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              }
            ],
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      }
    ],
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        },
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        "relates_to_product_reference": "17086"
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-25637",
      "cwe": {
        "id": "CWE-415",
        "name": "Double Free"
      },
      "notes": [
        {
          "category": "general",
          "text": "redhat",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
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          "19160-17086"
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        "known_affected": [
          "16820-2",
          "17086-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2020-25637 A double free memory issue was found to occur in the libvirt API in versions before 6.8.0 responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon resulting in a denial of service or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2020/msrc_cve-2020-25637.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-10-09T00:00:00.000Z",
          "details": "6.1.0-2:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
            "16820-2"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
        },
        {
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          "date": "2020-10-09T00:00:00.000Z",
          "details": "6.1.0-4:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
          "product_ids": [
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          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "temporalScore": 6.7,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "16820-2",
            "17086-1"
          ]
        }
      ],
      "title": "A double free memory issue was found to occur in the libvirt API in versions before 6.8.0 responsible for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit access control driver. Specifically clients connecting to the read-write socket with limited ACL permissions could use this flaw to crash the libvirt daemon resulting in a denial of service or potentially escalate their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."
    }
  ]
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.