CVE-2011-4096 (GCVE-0-2011-4096)

Vulnerability from cvelistv5 – Published: 2011-11-17 19:00 – Updated: 2024-08-06 23:53
VLAI
Summary
The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.
Severity
No CVSS data available.
CWE
  • n/a
References
URL Tags
http://bugs.squid-cache.org/show_bug.cgi?id=3237#c12 x_refsource_MISC
http://www.redhat.com/support/errata/RHSA-2011-17… vendor-advisoryx_refsource_REDHAT
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://www.openwall.com/lists/oss-security/2011/10/31/5 mailing-listx_refsource_MLIST
http://www.securitytracker.com/id?1026265 vdb-entryx_refsource_SECTRACK
http://www.openwall.com/lists/oss-security/2011/11/01/3 mailing-listx_refsource_MLIST
http://www.mandriva.com/security/advisories?name=… vendor-advisoryx_refsource_MANDRIVA
http://secunia.com/advisories/46609 third-party-advisoryx_refsource_SECUNIA
http://www.squid-cache.org/Versions/v3/3.1/change… x_refsource_CONFIRM
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://secunia.com/advisories/47459 third-party-advisoryx_refsource_SECUNIA
Date Public
2011-10-31 00:00
Show details on NVD website

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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record."
        },
        {
          "lang": "es",
          "value": "La funci\u00f3n idnsGrokReply en Squid anterior a v3.1.16 no adecuada de memoria libre, permite a atacantes remotos provocar una denegaci\u00f3n de servicio (daemon abortar) a trav\u00e9s de una respuesta DNS que contiene un registro CNAME que hace referencia a otro registro CNAME y este contiene un registro vac\u00edo."
        }
      ],
      "id": "CVE-2011-4096",
      "lastModified": "2024-11-21T01:31:50.260",
      "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": "2011-11-17T19:55:01.453",
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                ],
                "negate": false,
                "operator": "OR"
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            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record."
          },
          {
            "lang": "es",
            "value": "La funci\u00f3n idnsGrokReply en Squid anterior a v3.1.16 no adecuada de memoria libre, permite a atacantes remotos provocar una denegaci\u00f3n de servicio (daemon abortar) a trav\u00e9s de una respuesta DNS que contiene un registro CNAME que hace referencia a otro registro CNAME y este contiene un registro vac\u00edo."
          }
        ],
        "id": "CVE-2011-4096",
        "lastModified": "2026-04-29T01:13:23.040",
        "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": "2011-11-17T19:55:01.453",
        "references": [
          {
            "source": "secalert@redhat.com",
            "url": "http://bugs.squid-cache.org/show_bug.cgi?id=3237#c12"
          },
          {
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          },
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          },
          {
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            "url": "http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID_3_1_16.html"
          }
        ],
        "sourceIdentifier": "secalert@redhat.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-399"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T12:55:00+00:00",
      "cve": "CVE-2011-4096",
      "id": "CVE-2011-4096",
      "initial_release_date": "2011-06-06T00:00:00+00:00",
      "product_status:fixed": "18",
      "product_status:known_not_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "squid: Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2011/cve-2011-4096.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-04-30T02:42:35Z",
      "cve": "CVE-2011-4096",
      "id": "CVE-2011-4096",
      "initial_release_date": "2023-02-15T05:50:13Z",
      "product_status:known_affected": "1",
      "product_status:recommended": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2011-4096",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2011-4096.json",
      "version": "7"
    }
  }
}



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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.

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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.


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