rhsa-2003:173
Vulnerability from csaf_redhat
Published
2003-06-25 12:32
Modified
2024-11-21 22:45
Summary
Red Hat Security Advisory: : Updated ypserv packages fix a denial of service vulnerability

Notes

Topic
Updated ypserv packages fixing a denial of service vulnerability are now available.
Details
The ypserv package contains the Network Information Service (NIS) server. A vulnerability has been discovered in the ypserv NIS server prior to version 2.7. If a malicious client queries ypserv via TCP and subsequently ignores the server's response, ypserv will block attempting to send the reply. This results in ypserv failing to respond to other client requests. Versions 2.7 and above of ypserv have been altered to fork a child for each client request, thus preventing any one request from causing the server to block. Red Hat recommends that users of NIS upgrade to these packages, which contain version 2.8.0 of ypserv and are therefore not vulnerable to this issue.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "Updated ypserv packages fixing a denial of service vulnerability are now\navailable.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "The ypserv package contains the Network Information Service (NIS) server.\n\nA vulnerability has been discovered in the ypserv NIS server prior to\nversion 2.7.  If a malicious client queries ypserv via TCP and subsequently\nignores the server\u0027s response, ypserv will block attempting to send the\nreply.  This results in ypserv failing to respond to other client requests.\n\nVersions 2.7 and above of ypserv have been altered to fork a child for each\nclient request, thus preventing any one request from causing the server to\nblock.\n\nRed Hat recommends that users of NIS upgrade to these packages, which\ncontain version 2.8.0 of ypserv and are therefore not vulnerable to this issue.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2003:173",
        "url": "https://access.redhat.com/errata/RHSA-2003:173"
      },
      {
        "category": "external",
        "summary": "http://www.linux-nis.org/nis/ypserv/ChangeLog",
        "url": "http://www.linux-nis.org/nis/ypserv/ChangeLog"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2003/rhsa-2003_173.json"
      }
    ],
    "title": "Red Hat Security Advisory: : Updated ypserv packages fix a denial of service vulnerability",
    "tracking": {
      "current_release_date": "2024-11-21T22:45:36+00:00",
      "generator": {
        "date": "2024-11-21T22:45:36+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "4.2.1"
        }
      },
      "id": "RHSA-2003:173",
      "initial_release_date": "2003-06-25T12:32:00+00:00",
      "revision_history": [
        {
          "date": "2003-06-25T12:32:00+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2003-06-25T00:00:00+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2024-11-21T22:45:36+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Linux 7.1",
                "product": {
                  "name": "Red Hat Linux 7.1",
                  "product_id": "Red Hat Linux 7.1",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:redhat:linux:7.1"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Red Hat Linux 7.2",
                "product": {
                  "name": "Red Hat Linux 7.2",
                  "product_id": "Red Hat Linux 7.2",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:redhat:linux:7.2"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Red Hat Linux 7.3",
                "product": {
                  "name": "Red Hat Linux 7.3",
                  "product_id": "Red Hat Linux 7.3",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:redhat:linux:7.3"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Red Hat Linux 8.0",
                "product": {
                  "name": "Red Hat Linux 8.0",
                  "product_id": "Red Hat Linux 8.0",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:redhat:linux:8.0"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Red Hat Linux 9",
                "product": {
                  "name": "Red Hat Linux 9",
                  "product_id": "Red Hat Linux 9",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:redhat:linux:9"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Linux"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2003-0251",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1617010"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "ypserv NIS server before 2.7 allows remote attackers to cause a denial of service via a TCP client request that does not respond to the server, which causes ypserv to block.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "security flaw",
          "title": "Vulnerability summary"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Linux 7.1",
          "Red Hat Linux 7.2",
          "Red Hat Linux 7.3",
          "Red Hat Linux 8.0",
          "Red Hat Linux 9"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2003-0251"
        },
        {
          "category": "external",
          "summary": "RHBZ#1617010",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1617010"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2003-0251",
          "url": "https://www.cve.org/CVERecord?id=CVE-2003-0251"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2003-0251",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2003-0251"
        }
      ],
      "release_date": "2003-08-04T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2003-06-25T12:32:00+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nTo update all RPMs for your particular architecture, run:\n\nrpm -Fvh [filenames]\n\nwhere [filenames] is a list of the RPMs you wish to upgrade.  Only those\nRPMs which are currently installed will be updated.  Those RPMs which are\nnot installed but included in the list will not be updated.  Note that you\ncan also use wildcards (*.rpm) if your current directory *only* contains the\ndesired RPMs.\n\nPlease note that this update is also available via Red Hat Network.  Many\npeople find this an easier way to apply updates.  To use Red Hat Network,\nlaunch the Red Hat Update Agent with the following command:\n\nup2date\n\nThis will start an interactive process that will result in the appropriate\nRPMs being upgraded on your system.",
          "product_ids": [
            "Red Hat Linux 7.1",
            "Red Hat Linux 7.2",
            "Red Hat Linux 7.3",
            "Red Hat Linux 8.0",
            "Red Hat Linux 9"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2003:173"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "security flaw"
    }
  ]
}


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