FKIE_CVE-2013-6890

Vulnerability from fkie_nvd - Published: 2013-12-23 22:55 - Updated: 2026-06-17 00:01
Severity
Summary
denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names.
References
cve@mitre.orghttp://seclists.org/oss-sec/2013/q4/535
cve@mitre.orghttp://secunia.com/advisories/56239Vendor Advisory
cve@mitre.orghttp://www.debian.org/security/2013/dsa-2826
cve@mitre.orghttps://bugzilla.redhat.com/show_bug.cgi?id=1045982
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/oss-sec/2013/q4/535
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/56239Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.debian.org/security/2013/dsa-2826
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1045982
Impacted products
Vendor Product Version
debian debian_linux 6.0
debian debian_linux 7.0
debian debian_linux 7.1
fedoraproject fedora *
phil_schwartz denyhosts 2.6
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:o:debian:debian_linux:6.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "036E8A89-7A16-411F-9D31-676313BB7244",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "16F59A04-14CF-49E2-9973-645477EA09DA",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:*",
              "matchCriteriaId": "7B21E9A8-CE63-42C2-A11A-94D977A96DF1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "20294CE7-12C8-43CA-A702-5ED2A3044FFC",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:phil_schwartz:denyhosts:2.6:*:*:*:*:*:*:*",
              "matchCriteriaId": "B8215831-4E32-4451-AB45-598B8F5620A9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names."
    },
    {
      "lang": "es",
      "value": "denyhosts v2.6 utiliza una expresi\u00f3n regular incorrecta al analizar los registros de autenticaci\u00f3n, , lo cual permite a atacantes remotos causar una denegaci\u00f3n de servicio (secuencia incorrecta de direcciones IP) a trav\u00e9s de  nombres de inicio de sesi\u00f3n manipulados."
    }
  ],
  "id": "CVE-2013-6890",
  "lastModified": "2026-06-17T00:01:05.543",
  "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": "2013-12-23T22:55:03.050",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "http://seclists.org/oss-sec/2013/q4/535"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "http://secunia.com/advisories/56239"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.debian.org/security/2013/dsa-2826"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1045982"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://seclists.org/oss-sec/2013/q4/535"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "http://secunia.com/advisories/56239"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.debian.org/security/2013/dsa-2826"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1045982"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.