FKIE_CVE-2013-7040

Vulnerability from fkie_nvd - Published: 2014-05-19 14:55 - Updated: 2025-04-12 10:46
Severity ?
Summary
Python 2.7 before 3.4 only uses the last eight bits of the prefix to randomize hash values, which causes it to compute hash values without restricting the ability to trigger hash collisions predictably and makes it easier for context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-1150.
References
cve@mitre.orghttp://bugs.python.org/issue14621
cve@mitre.orghttp://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2013/12/09/13
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2013/12/09/3
cve@mitre.orghttp://www.securityfocus.com/bid/64194
cve@mitre.orghttps://support.apple.com/kb/HT205031Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://bugs.python.org/issue14621
af854a3a-2127-422b-91ae-364da2661108http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2013/12/09/13
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2013/12/09/3
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/64194
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT205031Vendor Advisory
Impacted products
Vendor Product Version
apple mac_os_x *
python python 2.7.1
python python 2.7.1
python python 2.7.2
python python 2.7.3
python python 2.7.4
python python 2.7.5
python python 2.7.6
python python 2.7.7
python python 2.7.1150
python python 2.7.2150
python python 3.0
python python 3.0.1
python python 3.1
python python 3.1.1
python python 3.1.2
python python 3.1.3
python python 3.1.4
python python 3.1.5
python python 3.2
python python 3.2
python python 3.2.0
python python 3.2.1
python python 3.2.2
python python 3.2.3
python python 3.2.4
python python 3.2.5
python python 3.2.2150
python python 3.3
python python 3.3
python python 3.3.0
python python 3.3.1
python python 3.3.1
python python 3.3.2
python python 3.3.3
python python 3.3.3
python python 3.3.3
python python 3.3.4
python python 3.3.4
python python 3.3.5
python python 3.3.5
python python 3.3.5
To clipboard 

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      "lang": "en",
      "value": "Python 2.7 before 3.4 only uses the last eight bits of the prefix to randomize hash values, which causes it to compute hash values without restricting the ability to trigger hash collisions predictably and makes it easier for context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.  NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-1150."
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    {
      "lang": "es",
      "value": "Python 2.7 anterior a 3.4 solamente utiliza las \u00faltimas ocho partes del prefijo para asignar valores de hash de forma aleatoria, lo que causa que calcule valores de hash sin restringir la habilidad de provocar colisiones de hash de forma previsible y facilita a atacantes dependientes de contexto causar una denegaci\u00f3n de servicio (consumo de CPU) a trav\u00e9s de entradas manipuladas hacia una aplicaci\u00f3n que mantiene una tabla de hash. NOTA: esta vulnerabilidad existe debido a una soluci\u00f3n incompleta para CVE-2012-1150."
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  "id": "CVE-2013-7040",
  "lastModified": "2025-04-12T10:46:40.837",
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        "baseSeverity": "MEDIUM",
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          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "version": "2.0"
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        "impactScore": 2.9,
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        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
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  "published": "2014-05-19T14:55:09.987",
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  • 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.
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  • 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.