gsd-2021-3732
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A flaw was found in the Linux kernel's OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible.
Aliases
Aliases
CVE-2021-3732


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-3732",
    "description": "A security issue was found in Linux kernel\u2019s OverlayFS subsystem where a local attacker who has the ability to mount the TmpFS filesystem with OverlayFS can abuse a logic bug in the overlayfs code which can inadvertently reveal files hidden in the original mount.",
    "id": "GSD-2021-3732",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-3732.html",
      "https://www.debian.org/security/2021/dsa-4978",
      "https://access.redhat.com/errata/RHSA-2021:4356",
      "https://access.redhat.com/errata/RHSA-2021:4140",
      "https://ubuntu.com/security/CVE-2021-3732",
      "https://security.archlinux.org/CVE-2021-3732",
      "https://alas.aws.amazon.com/cve/html/CVE-2021-3732.html",
      "https://linux.oracle.com/cve/CVE-2021-3732.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-3732"
      ],
      "details": "A flaw was found in the Linux kernel\u0027s OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible.",
      "id": "GSD-2021-3732",
      "modified": "2023-12-13T01:23:34.101625Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "secalert@redhat.com",
        "ID": "CVE-2021-3732",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "kernel",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "Affects kernel before v5.13.11, Fixed in v5.14-rc6 and later."
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
          ]
        }
      },
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          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1995249",
            "refsource": "MISC",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1995249"
          },
          {
            "name": "https://ubuntu.com/security/CVE-2021-3732",
            "refsource": "MISC",
            "url": "https://ubuntu.com/security/CVE-2021-3732"
          },
          {
            "name": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d1476da1a86b8d67aceb485eb3631",
            "refsource": "MISC",
            "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d1476da1a86b8d67aceb485eb3631"
          },
          {
            "name": "https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631",
            "refsource": "MISC",
            "url": "https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "5.14",
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              },
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "secalert@redhat.com",
          "ID": "CVE-2021-3732"
        },
        "data_format": "MITRE",
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        "description": {
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              "value": "A flaw was found in the Linux kernel\u0027s OverlayFS subsystem in the way the user mounts the TmpFS filesystem with OverlayFS. This flaw allows a local user to gain access to hidden files that should not be accessible."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "NVD-CWE-noinfo"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://ubuntu.com/security/CVE-2021-3732",
              "refsource": "MISC",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://ubuntu.com/security/CVE-2021-3732"
            },
            {
              "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1995249",
              "refsource": "MISC",
              "tags": [
                "Issue Tracking",
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1995249"
            },
            {
              "name": "https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631",
              "refsource": "MISC",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/torvalds/linux/commit/427215d85e8d1476da1a86b8d67aceb485eb3631"
            },
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              "refsource": "MISC",
              "tags": [
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                "Patch",
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              ],
              "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=427215d85e8d1476da1a86b8d67aceb485eb3631"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 2.1,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/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": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-12-13T19:50Z",
      "publishedDate": "2022-03-10T17:42Z"
    }
  }
}


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