FKIE_CVE-2009-4418

Vulnerability from fkie_nvd - Published: 2009-12-24 17:30 - Updated: 2026-04-23 00:35
Severity ?
Summary
The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences.
References
cve@mitre.orghttp://www.suspekt.org/2009/11/28/shocking-news-in-php-exploitation/
cve@mitre.orghttp://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf
af854a3a-2127-422b-91ae-364da2661108http://www.suspekt.org/2009/11/28/shocking-news-in-php-exploitation/
af854a3a-2127-422b-91ae-364da2661108http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf
Impacted products
Vendor Product Version
php php *
php php 5
php php 5.0
php php 5.0
php php 5.0
php php 5.0.0
php php 5.0.0
php php 5.0.0
php php 5.0.0
php php 5.0.0
php php 5.0.0
php php 5.0.0
php php 5.0.0
php php 5.0.1
php php 5.0.2
php php 5.0.3
php php 5.0.4
php php 5.0.5
php php 5.1.0
php php 5.1.1
php php 5.1.2
php php 5.1.3
php php 5.1.4
php php 5.1.5
php php 5.1.6
php php 5.2.0
php php 5.2.1
php php 5.2.2
php php 5.2.3
php php 5.2.4
php php 5.2.4
php php 5.2.5
php php 5.2.6
php php 5.2.7
php php 5.2.8
php php 5.2.9
php php 5.2.10
php php 5.2.11
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable, as demonstrated by a string beginning with a:1: followed by many {a:1: sequences."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n deserializada (unserialize) en PHP 5.3.0 y anteriores permite a atacantes dependientes del contexto causar una denegaci\u00f3n de servicio (consumo de recursos) a trav\u00e9s una variables anidadas profundamente, como queda demostrada con una cadena inicializada con a:1: seguida de una larga secuencia {a:1: ."
    }
  ],
  "id": "CVE-2009-4418",
  "lastModified": "2026-04-23T00:35:47.467",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
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  },
  "published": "2009-12-24T17:30:00.233",
  "references": [
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      "source": "cve@mitre.org",
      "url": "http://www.suspekt.org/2009/11/28/shocking-news-in-php-exploitation/"
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    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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  "vendorComments": [
    {
      "comment": "Red Hat does not consider this to be a security flaw. For further details, see https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-4418",
      "lastModified": "2010-01-04T00:00:00",
      "organization": "Red Hat"
    }
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-189"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
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}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.