GSD-2021-32707

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.
Aliases
Aliases
CVE-2021-32707
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{
  "GSD": {
    "alias": "CVE-2021-32707",
    "description": "Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.",
    "id": "GSD-2021-32707",
    "references": [
      "https://security.archlinux.org/CVE-2021-32707"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-32707"
      ],
      "details": "Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist.",
      "id": "GSD-2021-32707",
      "modified": "2023-12-13T01:23:09.204115Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-32707",
        "STATE": "PUBLIC",
        "TITLE": "Bypass of image blocking in Nextcloud Mail"
      },
      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "security-advisories",
                    "version": {
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          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        }
      },
      "problemtype": {
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            "description": [
              {
                "lang": "eng",
                "value": "CWE-20: Improper Input Validation"
              }
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          },
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crh",
            "refsource": "CONFIRM",
            "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crh"
          },
          {
            "name": "https://github.com/nextcloud/mail/pull/5189",
            "refsource": "MISC",
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          },
          {
            "name": "https://hackerone.com/reports/1215251",
            "refsource": "MISC",
            "url": "https://hackerone.com/reports/1215251"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-xxp4-44xc-8crh",
        "discovery": "UNKNOWN"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:nextcloud:nextcloud_mail:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.9.6",
                "vulnerable": true
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        "description": {
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              "value": "Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by default, render images in emails to not leak the read state. The privacy filter failed to filter images with a `background-image` CSS attribute. Note that the images were still passed through the Nextcloud image proxy, and thus there was no IP leakage. The issue was patched in version 1.9.6 and 1.10.0. No workarounds are known to exist."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
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                  "value": "NVD-CWE-Other"
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              "refsource": "MISC",
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            },
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            },
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              "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crh",
              "refsource": "CONFIRM",
              "tags": [
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              ],
              "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xxp4-44xc-8crh"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "NONE",
            "baseScore": 4.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
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            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2022-10-25T15:41Z",
      "publishedDate": "2021-07-12T19:15Z"
    }
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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