GSD-2019-12831

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
In MyBB before 1.8.21, an attacker can abuse a default behavior of MySQL on many systems (that leads to truncation of strings that are too long for a database column) to create a PHP shell in the cache directory of a targeted forum via a crafted XML import, as demonstrated by truncation of aaaaaaaaaaaaaaaaaaaaaaaaaa.php.css to aaaaaaaaaaaaaaaaaaaaaaaaaa.php with a 30-character limit, aka theme import stylesheet name RCE.
Aliases
Aliases
CVE-2019-12831
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{
  "GSD": {
    "alias": "CVE-2019-12831",
    "description": "In MyBB before 1.8.21, an attacker can abuse a default behavior of MySQL on many systems (that leads to truncation of strings that are too long for a database column) to create a PHP shell in the cache directory of a targeted forum via a crafted XML import, as demonstrated by truncation of aaaaaaaaaaaaaaaaaaaaaaaaaa.php.css to aaaaaaaaaaaaaaaaaaaaaaaaaa.php with a 30-character limit, aka theme import stylesheet name RCE.",
    "id": "GSD-2019-12831"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2019-12831"
      ],
      "details": "In MyBB before 1.8.21, an attacker can abuse a default behavior of MySQL on many systems (that leads to truncation of strings that are too long for a database column) to create a PHP shell in the cache directory of a targeted forum via a crafted XML import, as demonstrated by truncation of aaaaaaaaaaaaaaaaaaaaaaaaaa.php.css to aaaaaaaaaaaaaaaaaaaaaaaaaa.php with a 30-character limit, aka theme import stylesheet name RCE.",
      "id": "GSD-2019-12831",
      "modified": "2023-12-13T01:23:43.952358Z",
      "schema_version": "1.4.0"
    }
  },
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        "ID": "CVE-2019-12831",
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      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "n/a"
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        "reference_data": [
          {
            "name": "https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/",
            "refsource": "MISC",
            "url": "https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/"
          },
          {
            "name": "https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/",
            "refsource": "MISC",
            "url": "https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/"
          }
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      }
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        "nodes": [
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            "cpe_match": [
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                "cpe23Uri": "cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.8.21",
                "vulnerable": true
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        "description": {
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              "value": "In MyBB before 1.8.21, an attacker can abuse a default behavior of MySQL on many systems (that leads to truncation of strings that are too long for a database column) to create a PHP shell in the cache directory of a targeted forum via a crafted XML import, as demonstrated by truncation of aaaaaaaaaaaaaaaaaaaaaaaaaa.php.css to aaaaaaaaaaaaaaaaaaaaaaaaaa.php with a 30-character limit, aka theme import stylesheet name RCE."
            }
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        "problemtype": {
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        "references": {
          "reference_data": [
            {
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              "refsource": "MISC",
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              "url": "https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/"
            },
            {
              "name": "https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/",
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      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.5,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.0,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "exploitabilityScore": 1.2,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2019-06-17T19:01Z",
      "publishedDate": "2019-06-15T18:29Z"
    }
  }
}



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