rhsa-2003:221
Vulnerability from csaf_redhat
Published
2003-07-25 13:14
Modified
2024-11-21 22:47
Summary
Red Hat Security Advisory: : Updated stunnel packages fix signal vulnerability

Notes

Topic
Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3, and 8.0. These updates correct a potential vulnerability in stunnel's signal handling.
Details
Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over a secure connection (encrypted using SSL or TLS) or to provide a secure means of connecting to services that do not natively support encryption. When configured to listen for incoming connections (instead of being invoked by xinetd), stunnel can be configured to either start a thread or a child process to handle each new connection. If Stunnel is configured to start a new child process to handle each connection, it will receive a SIGCHLD signal when that child exits. Stunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal handler which, if interrupted by another SIGCHLD signal, could be unsafe. This could lead to a denial of service. All users are urged to upgrade to these errata packages, which modify stunnel's signal handler so that it is not vulnerable to this issue. NOTE: After upgrading, any instances of stunnel configured to run in daemon mode should be restarted, and any active network connections that are currently being serviced by stunnel should be terminated and reestablished.
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.


To clipboard 

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "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 stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,\nand 8.0.  These updates correct a potential vulnerability in stunnel\u0027s\nsignal handling.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Stunnel is a wrapper for network connections.  It can be used to tunnel an\nunencrypted network connection over a secure connection (encrypted using\nSSL or TLS) or to provide a secure means of connecting to services that do\nnot natively support encryption.\n\nWhen configured to listen for incoming connections (instead of being\ninvoked by xinetd), stunnel can be configured to either start a thread or a\nchild process to handle each new connection. If Stunnel is configured to\nstart a new child process to handle each connection, it will receive a\nSIGCHLD signal when that child exits. \n\nStunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal\nhandler which, if interrupted by another SIGCHLD signal, could be unsafe.\nThis could lead to a denial of service.\n\nAll users are urged to upgrade to these errata packages, which modify\nstunnel\u0027s signal handler so that it is not vulnerable to this issue.\n\nNOTE: After upgrading, any instances of stunnel configured to run in daemon\nmode should be restarted, and any active network connections that are\ncurrently being serviced by stunnel should be terminated and reestablished.",
        "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-2003:221",
        "url": "https://access.redhat.com/errata/RHSA-2003:221"
      },
      {
        "category": "external",
        "summary": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=103600188215117",
        "url": "http://marc.theaimsgroup.com/?l=stunnel-users\u0026m=103600188215117"
      },
      {
        "category": "external",
        "summary": "82325",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=82325"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2003/rhsa-2003_221.json"
      }
    ],
    "title": "Red Hat Security Advisory: : Updated stunnel packages fix signal vulnerability",
    "tracking": {
      "current_release_date": "2024-11-21T22:47:38+00:00",
      "generator": {
        "date": "2024-11-21T22:47:38+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "4.2.1"
        }
      },
      "id": "RHSA-2003:221",
      "initial_release_date": "2003-07-25T13:14:00+00:00",
      "revision_history": [
        {
          "date": "2003-07-25T13:14:00+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2003-07-25T00:00:00+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2024-11-21T22:47:38+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_family",
            "name": "Red Hat Linux"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2002-1563",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1616922"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.",
          "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"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2002-1563"
        },
        {
          "category": "external",
          "summary": "RHBZ#1616922",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1616922"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2002-1563",
          "url": "https://www.cve.org/CVERecord?id=CVE-2002-1563"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2002-1563",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2002-1563"
        }
      ],
      "release_date": "2002-10-30T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2003-07-25T13:14:00+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"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2003:221"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "security flaw"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.