FKIE_CVE-2006-6931

Vulnerability from fkie_nvd - Published: 2007-01-16 23:28 - Updated: 2026-06-16 22:34
Severity
Summary
Algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching for certain rules, allows remote attackers to cause a denial of service (CPU consumption and detection outage) via crafted network traffic, aka a "backtracking attack."
References
cve@mitre.orghttp://lists.immunitysec.com/pipermail/dailydave/2007-January/003954.html
cve@mitre.orghttp://secunia.com/advisories/23716
cve@mitre.orghttp://secunia.com/advisories/24164
cve@mitre.orghttp://secunia.com/advisories/24338
cve@mitre.orghttp://security.gentoo.org/glsa/glsa-200702-03.xml
cve@mitre.orghttp://securitytracker.com/id?1017508
cve@mitre.orghttp://www.acsac.org/2006/abstracts/54.html
cve@mitre.orghttp://www.acsac.org/2006/advance_program.html
cve@mitre.orghttp://www.acsac.org/2006/papers/54.pdfVendor Advisory
cve@mitre.orghttp://www.cs.wisc.edu/~smithr/pubs/acsac2006.pdfVendor Advisory
cve@mitre.orghttp://www.cs.wisc.edu/~smithr/pubs/randy_smith_acsac2006.zip
cve@mitre.orghttp://www.mandriva.com/security/advisories?name=MDKSA-2007:051
cve@mitre.orghttp://www.osvdb.org/32096
cve@mitre.orghttp://www.securityfocus.com/bid/21991
cve@mitre.orghttp://www.snort.org/pub-bin/snortnews.cgi
cve@mitre.orghttps://exchange.xforce.ibmcloud.com/vulnerabilities/31430
af854a3a-2127-422b-91ae-364da2661108http://lists.immunitysec.com/pipermail/dailydave/2007-January/003954.html
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/23716
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/24164
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/24338
af854a3a-2127-422b-91ae-364da2661108http://security.gentoo.org/glsa/glsa-200702-03.xml
af854a3a-2127-422b-91ae-364da2661108http://securitytracker.com/id?1017508
af854a3a-2127-422b-91ae-364da2661108http://www.acsac.org/2006/abstracts/54.html
af854a3a-2127-422b-91ae-364da2661108http://www.acsac.org/2006/advance_program.html
af854a3a-2127-422b-91ae-364da2661108http://www.acsac.org/2006/papers/54.pdfVendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.cs.wisc.edu/~smithr/pubs/acsac2006.pdfVendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.cs.wisc.edu/~smithr/pubs/randy_smith_acsac2006.zip
af854a3a-2127-422b-91ae-364da2661108http://www.mandriva.com/security/advisories?name=MDKSA-2007:051
af854a3a-2127-422b-91ae-364da2661108http://www.osvdb.org/32096
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/21991
af854a3a-2127-422b-91ae-364da2661108http://www.snort.org/pub-bin/snortnews.cgi
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/31430
Impacted products
Vendor Product Version
snort snort *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:snort:snort:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "020FACB7-031C-43A3-A138-61E0C24F467D",
              "versionEndIncluding": "2.6.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching for certain rules, allows remote attackers to cause a denial of service (CPU consumption and detection outage) via crafted network traffic, aka a \"backtracking attack.\""
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de complejidad algor\u00edtmica en Snort anterior a 2.6.1, durante la evaluaci\u00f3n de un predicado en el chequeo de reglas para ciertas reglas, permite a atacantes remotos provocar una denegaci\u00f3n de servicio (consumo de CPU y parada de detecci\u00f3n) mediante tr\u00e1fico de red manipulado, tambi\u00e9n conocido como un \"ataque de vuelta hacia atr\u00e1s\" (backtracking attack)."
    }
  ],
  "id": "CVE-2006-6931",
  "lastModified": "2026-06-16T22:34:04.350",
  "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
      }
    ]
  },
  "published": "2007-01-16T23:28:00.000",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "http://lists.immunitysec.com/pipermail/dailydave/2007-January/003954.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://secunia.com/advisories/23716"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://secunia.com/advisories/24164"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://secunia.com/advisories/24338"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://security.gentoo.org/glsa/glsa-200702-03.xml"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://securitytracker.com/id?1017508"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.acsac.org/2006/abstracts/54.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.acsac.org/2006/advance_program.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "http://www.acsac.org/2006/papers/54.pdf"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "http://www.cs.wisc.edu/~smithr/pubs/acsac2006.pdf"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.cs.wisc.edu/~smithr/pubs/randy_smith_acsac2006.zip"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.mandriva.com/security/advisories?name=MDKSA-2007:051"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.osvdb.org/32096"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.securityfocus.com/bid/21991"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.snort.org/pub-bin/snortnews.cgi"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/31430"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://lists.immunitysec.com/pipermail/dailydave/2007-January/003954.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://secunia.com/advisories/23716"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://secunia.com/advisories/24164"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://secunia.com/advisories/24338"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://security.gentoo.org/glsa/glsa-200702-03.xml"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://securitytracker.com/id?1017508"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.acsac.org/2006/abstracts/54.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.acsac.org/2006/advance_program.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "http://www.acsac.org/2006/papers/54.pdf"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "http://www.cs.wisc.edu/~smithr/pubs/acsac2006.pdf"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.cs.wisc.edu/~smithr/pubs/randy_smith_acsac2006.zip"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.mandriva.com/security/advisories?name=MDKSA-2007:051"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.osvdb.org/32096"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.securityfocus.com/bid/21991"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.snort.org/pub-bin/snortnews.cgi"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/31430"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.



Related by attack behaviour

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