rhsa-2024_1544
Vulnerability from csaf_redhat
Published
2024-03-27 15:11
Modified
2024-11-24 12:54
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 8.8 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: 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) Bug Fix: * Segmentation fault occurs in dnsmasq-2.79-26 in RHEL8 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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        "name": "Allocation of Resources Without Limits or Throttling"
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      "discovery_date": "2023-03-16T00:00:00+00:00",
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        {
          "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"
        },
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          "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"
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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      "cve": "CVE-2023-50387",
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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"
        },
        {
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          "text": "bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator",
          "title": "Vulnerability summary"
        },
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          "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"
        },
        {
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            "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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      "title": "bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator"
    },
    {
      "cve": "CVE-2023-50868",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
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      "discovery_date": "2024-02-12T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2263917"
        }
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        {
          "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"
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2024:1544"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "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": "Important"
        }
      ],
      "title": "bind9: Preparing an NSEC3 closest encloser proof can exhaust CPU resources"
    }
  ]
}


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