gsd-2020-8162
Vulnerability from gsd
Modified
2020-05-18 00:00
Details
There is a vulnerability in ActiveStorage's S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user. Versions Affected: rails < 5.2.4.2, rails < 6.0.3.1 Not affected: Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter. Fixed Versions: rails >= 5.2.4.3, rails >= 6.0.3.1 Impact ------ Utilizing this vulnerability, an attacker can control the Content-Length of an S3 direct upload URL without receiving a new signature from the server. This could be used to bypass controls in place on the server to limit upload size. Workarounds ----------- This is a low-severity security issue. As such, no workaround is necessarily until such time as the application can be upgraded.
Aliases
Aliases
CVE-2020-8162


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-8162",
    "description": "A client side enforcement of server side security vulnerability exists in rails \u003c 5.2.4.2 and rails \u003c 6.0.3.1 ActiveStorage\u0027s S3 adapter that allows the Content-Length of a direct file upload to be modified by an end user bypassing upload limits.",
    "id": "GSD-2020-8162",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-8162.html",
      "https://www.debian.org/security/2020/dsa-4766",
      "https://access.redhat.com/errata/RHSA-2021:1313"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "activestorage",
            "purl": "pkg:gem/activestorage"
          }
        }
      ],
      "aliases": [
        "CVE-2020-8162",
        "GHSA-m42x-37p3-fv5w"
      ],
      "details": "There is a vulnerability in ActiveStorage\u0027s S3 adapter that allows the Content-Length of a\ndirect file upload to be modified by an end user.\n\nVersions Affected:  rails \u003c 5.2.4.2, rails \u003c 6.0.3.1\nNot affected:       Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter.\nFixed Versions:     rails \u003e= 5.2.4.3, rails \u003e= 6.0.3.1\n\nImpact\n------\n\nUtilizing this vulnerability, an attacker can control the Content-Length of an S3 direct upload URL without receiving a\nnew signature from the server. This could be used to bypass controls in place on the server to limit upload size.\n\nWorkarounds\n-----------\n\nThis is a low-severity security issue. As such, no workaround is necessarily\nuntil such time as the application can be upgraded.\n",
      "id": "GSD-2020-8162",
      "modified": "2020-05-18T00:00:00.000Z",
      "published": "2020-05-18T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://groups.google.com/forum/#!topic/rubyonrails-security/PjU3946mreQ"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 7.5,
          "type": "CVSS_V3"
        }
      ],
      "summary": "Circumvention of file size limits in ActiveStorage"
    }
  },
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      "date": "2020-05-18",
      "description": "There is a vulnerability in ActiveStorage\u0027s S3 adapter that allows the Content-Length of a\ndirect file upload to be modified by an end user.\n\nVersions Affected:  rails \u003c 5.2.4.2, rails \u003c 6.0.3.1\nNot affected:       Applications that do not use the direct upload functionality of the ActiveStorage S3 adapter.\nFixed Versions:     rails \u003e= 5.2.4.3, rails \u003e= 6.0.3.1\n\nImpact\n------\n\nUtilizing this vulnerability, an attacker can control the Content-Length of an S3 direct upload URL without receiving a\nnew signature from the server. This could be used to bypass controls in place on the server to limit upload size.\n\nWorkarounds\n-----------\n\nThis is a low-severity security issue. As such, no workaround is necessarily\nuntil such time as the application can be upgraded.\n",
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      "gem": "activestorage",
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      "patched_versions": [
        "~\u003e 5.2.4, \u003e= 5.2.4.3",
        "\u003e= 6.0.3.1"
      ],
      "title": "Circumvention of file size limits in ActiveStorage",
      "url": "https://groups.google.com/forum/#!topic/rubyonrails-security/PjU3946mreQ"
    },
    "gitlab.com": {
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          ],
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          ],
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          ],
          "not_impacted": "All versions starting from 5.2.4.2 before 6.0.0, all versions starting from 6.0.3.1",
          "package_slug": "gem/activestorage",
          "pubdate": "2020-06-19",
          "solution": "Upgrade to versions 5.2.4.2, 6.0.3.1 or above.",
          "title": "Unrestricted Upload of File with Dangerous Type",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-8162",
            "https://groups.google.com/g/rubyonrails-security/c/PjU3946mreQ",
            "https://hackerone.com/reports/789579",
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          ],
          "uuid": "e50be25a-8dec-4bb8-958f-abea9bfeea8e"
        },
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          "affected_range": "\u003c5.2.4.2||\u003e=6.0.0 \u003c6.0.3.1",
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            "CWE-434",
            "CWE-937"
          ],
          "date": "2020-09-25",
          "description": "A client side enforcement of server side security vulnerability exists in rails and rails ActiveStorage\u0027s S3 adapter that allows the `Content-Length` of a direct file upload to be modified by an end user bypassing upload limits.",
          "fixed_versions": [
            "5.2.4.2",
            "6.0.3.1"
          ],
          "identifier": "CVE-2020-8162",
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          "package_slug": "gem/rails",
          "pubdate": "2020-06-19",
          "solution": "Upgrade to versions 5.2.4.2, 6.0.3.1 or above.",
          "title": "Unrestricted Upload of File with Dangerous Type",
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            "https://nvd.nist.gov/vuln/detail/CVE-2020-8162"
          ],
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        }
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                "versionEndExcluding": "6.0.3.1",
                "versionStartIncluding": "6.0.0",
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      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
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        },
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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            "version": "3.1"
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          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-05-24T16:15Z",
      "publishedDate": "2020-06-19T17:15Z"
    }
  }
}


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