rhsa-2024_1545
Vulnerability from csaf_redhat
Published
2024-03-27 15:12
Modified
2024-12-12 14:17
Summary
Red Hat Security Advisory: dnsmasq security update

Notes

Topic
An update for dnsmasq is now available for Red Hat Enterprise Linux 8.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. 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 Fixes: * dnsmasq: Heap use after free in dhcp6_no_relay (CVE-2022-0934) * dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232 (CVE-2023-28450) * dnsmasq: bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator (CVE-2023-50387) * dnsmasq: bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources (CVE-2023-50868) 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.
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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          "title": "Statement"
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            "baseScore": 7.5,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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      "title": "dnsmasq: default maximum EDNS.0 UDP packet size was set to 4096 but should be 1232"
    },
    {
      "cve": "CVE-2023-50387",
      "cwe": {
        "id": "CWE-400",
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      "ids": [
        {
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          "text": "2263914"
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        {
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          "text": "Processing specially crafted responses coming from DNSSEC-signed zones can lead to uncontrolled CPU usage, leading to a Denial of Service in the DNSSEC-validating resolver side.\r\n\r\nThis vulnerability applies only for systems where DNSSEC validation is enabled.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability in DNSSEC-validating resolvers is of important severity because it can lead to uncontrolled CPU consumption, resulting in a Denial of Service (DoS). By exploiting this flaw, attackers can send specially crafted DNS responses that cause the resolver to enter a state of excessive resource utilization. This can severely impact the availability and performance of DNS services, affecting not only the targeted resolver but potentially cascading to other dependent systems and services.",
          "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"
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
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          "details": "Important"
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      ],
      "title": "bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator"
    },
    {
      "cve": "CVE-2023-50868",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "discovery_date": "2024-02-12T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2263917"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in bind9. By flooding a DNSSEC resolver with responses coming from a DNSEC-signed zone using NSEC3, an attacker can lead the targeted resolver to a CPU exhaustion, further leading to a Denial of Service on the targeted host.\r\n\r\nThis vulnerability applies only for systems where DNSSEC validation is enabled.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The vulnerability in BIND9 that leads to CPU exhaustion through a flood of DNSSEC responses with NSEC3 signatures is a important severity issue due to its potential to induce a Denial of Service (DoS) condition on affected resolvers. By exploiting this flaw, an attacker can overwhelm a DNSSEC-enabled resolver with computationally intensive tasks, depleting CPU resources and disrupting normal DNS operations. This can result in significant service outages, affecting the resolver\u0027s ability to process legitimate DNS queries and thereby compromising network availability and reliability. The impact is exacerbated in high-traffic environments or where DNSSEC validation is extensively employed, making prompt remediation essential to prevent operational disruptions and maintain DNS infrastructure integrity.",
          "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-2023-50868"
        },
        {
          "category": "external",
          "summary": "RHBZ#2263917",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2263917"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2023-50868",
          "url": "https://www.cve.org/CVERecord?id=CVE-2023-50868"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-50868",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-50868"
        },
        {
          "category": "external",
          "summary": "https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released",
          "url": "https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released"
        },
        {
          "category": "external",
          "summary": "https://kb.isc.org/docs/cve-2023-50868",
          "url": "https://kb.isc.org/docs/cve-2023-50868"
        },
        {
          "category": "external",
          "summary": "https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html",
          "url": "https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html"
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      "release_date": "2024-02-13T00:00:00+00:00",
      "remediations": [
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          "date": "2024-03-27T15:12:39+00:00",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources"
    }
  ]
}


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