rhsa-2023_7046
Vulnerability from csaf_redhat
Published
2023-11-14 15:53
Modified
2024-11-23 00:02
Summary
Red Hat Security Advisory: dnsmasq security and bug fix update

Notes

Topic
An update for dnsmasq is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server. Security Fix(es): * dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 (CVE-2023-28450) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.9 Release Notes linked from the References section.
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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  "vulnerabilities": [
    {
      "cve": "CVE-2023-28450",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2023-03-16T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2178948"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Dnsmasq. The default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 because of DNS Flag Day 2020.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The severity of this vulnerability is not important but moderate because exploiting the vulnerability can lead to a theoretical disruption of the availability of the service, but doesn\u2019t directly compromise data integrity or confidentiality. This theoretical disruption would require an attacker to be able to induce IP fragmentation during transmission and can be mitigated with a simple configuration change in any affected version. A successful attack would require significant target specific preparation and the ability to act as a man-in-the-middle or control the path MTU of the authoritative DNS server. Additionally, this CVE is easily remediated by setting the edns-packet-max value to 1232 in the dnsmasq configuration.\n\nThe changes made for DNS Flag Day 2020 were primarily related to improving service reliability in order to make sure that DNS servers do not experience transmission failures due to IP fragmentation over networks of unknown MTU configurations. This change of the default maximum EDNS Buffer Size was coordinated so that default configurations of DNS services would provide more reliable default settings as well as avoid attacks on DNS services that can only be made possible when UDP packets are fragmented in transit. For example, if the DNS Query ID and UDP port are carried in the first IP fragment, an attacker could spoof the second fragment and poison the DNS cache by swapping the subsequent good IP fragments with their own. \n\nBy using a default maximum EDNS value of 1232 (the largest value found to avoids fragmentation on nearly all modern networks) and relying on TCP for DNS queries with larger responses, IP Fragmentation issues can be reliably avoided with the default dnsmasq configuration.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2023-28450"
        },
        {
          "category": "external",
          "summary": "RHBZ#2178948",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2178948"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-28450",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-28450"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-28450",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-28450"
        },
        {
          "category": "external",
          "summary": "https://github.com/advisories/GHSA-vgrx-vhjf-p7wv",
          "url": "https://github.com/advisories/GHSA-vgrx-vhjf-p7wv"
        }
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      "release_date": "2023-03-15T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2023-11-14T15:53:12+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2023:7046"
        },
        {
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232"
    }
  ]
}


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