RHSA-2003:151

Vulnerability from csaf_redhat - Published: 2003-06-09 13:44 - Updated: 2025-11-21 17:25
Summary
Red Hat Security Advisory: tcpdump security update

Notes

Topic
Updated tcpdump packages that fix an infinite loop vulnerability and drop privileges on startup are now available.
Details
Tcpdump is a command-line tool for monitoring network traffic. A vulnerability exists in tcpdump before 3.7.2 and is related to an inability to handle unknown RADIUS attributes properly. This vulnerability allows remote attackers to cause a denial of service (infinite loop). The Red Hat tcpdump packages advertise that, by default, tcpdump will drop privileges to user 'pcap'. Due to a compilation error this did not happen, and tcpdump would run as root unless the '-U' flag was specified. Users of tcpdump are advised to upgrade to these errata packages, which contain a patch correcting the RADIUS issue and are compiled so that by default tcpdump will drop privileges to the 'pcap' user.
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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    "notes": [
      {
        "category": "summary",
        "text": "Updated tcpdump packages that fix an infinite loop vulnerability and drop\nprivileges on startup are now available.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Tcpdump is a command-line tool for monitoring network traffic. \n\nA vulnerability exists in tcpdump before 3.7.2 and is related to an\ninability to handle unknown RADIUS attributes properly.  This vulnerability\n allows remote attackers to cause a denial of service (infinite loop).\n\nThe Red Hat tcpdump packages advertise that, by default, tcpdump will drop\nprivileges to user \u0027pcap\u0027.  Due to a compilation error this did not\nhappen, and tcpdump would run as root unless the \u0027-U\u0027 flag was specified.\n\nUsers of tcpdump are advised to upgrade to these errata packages, which\ncontain a patch correcting the RADIUS issue and are compiled so that by\ndefault tcpdump will drop privileges to the \u0027pcap\u0027 user.",
        "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"
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    "tracking": {
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    "branches": [
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        "branches": [
          {
            "branches": [
              {
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          "text": "Unknown vulnerability in tcpdump before 3.7.2 related to an inability to \"Handle unknown RADIUS attributes properly,\" allows remote attackers to cause a denial of service (infinite loop), a different vulnerability than CAN-2003-0093.",
          "title": "Vulnerability description"
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          "product_ids": [
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          "url": "https://access.redhat.com/errata/RHSA-2003:151"
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}


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Sightings

Author Source Type Date

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.