gsd-2021-20263
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.
Aliases
Aliases
CVE-2021-20263


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-20263",
    "description": "A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new \u0027xattrmap\u0027 option may cause the \u0027security.capability\u0027 xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.",
    "id": "GSD-2021-20263",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-20263.html",
      "https://security.archlinux.org/CVE-2021-20263"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-20263"
      ],
      "details": "A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new \u0027xattrmap\u0027 option may cause the \u0027security.capability\u0027 xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.",
      "id": "GSD-2021-20263",
      "modified": "2023-12-13T01:23:12.346867Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "secalert@redhat.com",
        "ID": "CVE-2021-20263",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "QEMU",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "qemu 5.2.50"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new \u0027xattrmap\u0027 option may cause the \u0027security.capability\u0027 xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest."
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-281"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1933668",
            "refsource": "MISC",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1933668"
          },
          {
            "name": "https://www.openwall.com/lists/oss-security/2021/03/08/1",
            "refsource": "MISC",
            "url": "https://www.openwall.com/lists/oss-security/2021/03/08/1"
          },
          {
            "name": "https://security.netapp.com/advisory/ntap-20210507-0002/",
            "refsource": "CONFIRM",
            "url": "https://security.netapp.com/advisory/ntap-20210507-0002/"
          },
          {
            "name": "GLSA-202208-27",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202208-27"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "5.2.50",
                "versionStartIncluding": "5.0.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "secalert@redhat.com",
          "ID": "CVE-2021-20263"
        },
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        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new \u0027xattrmap\u0027 option may cause the \u0027security.capability\u0027 xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-281"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.openwall.com/lists/oss-security/2021/03/08/1",
              "refsource": "MISC",
              "tags": [
                "Mailing List",
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://www.openwall.com/lists/oss-security/2021/03/08/1"
            },
            {
              "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1933668",
              "refsource": "MISC",
              "tags": [
                "Issue Tracking",
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1933668"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20210507-0002/",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://security.netapp.com/advisory/ntap-20210507-0002/"
            },
            {
              "name": "GLSA-202208-27",
              "refsource": "GENTOO",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://security.gentoo.org/glsa/202208-27"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 2.1,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 3.3,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2022-09-30T13:29Z",
      "publishedDate": "2021-03-09T18:15Z"
    }
  }
}


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