rhsa-2022_8385
Vulnerability from csaf_redhat
Published
2022-11-15 09:56
Modified
2024-11-22 19:14
Summary
Red Hat Security Advisory: dhcp security and enhancement update

Notes

Topic
An update for dhcp is now available for Red Hat Enterprise Linux 9. 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 Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Security Fix(es): * bind: DNS forwarders - cache poisoning vulnerability (CVE-2021-25220) 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 9.1 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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        "text": "An update for dhcp is now available for Red Hat Enterprise Linux 9.\n\nRed 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.",
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        "text": "The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network.\n\nSecurity Fix(es):\n\n* bind: DNS forwarders - cache poisoning vulnerability (CVE-2021-25220)\n\nFor 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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 9.1 Release Notes linked from the References section.",
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          "names": [
            "Baojun Liu",
            "Chaoyi Lu",
            "Xiang Li"
          ],
          "organization": "Network and Information Security Lab, Tsinghua University",
          "summary": "Acknowledged by upstream."
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          "summary": "Acknowledged by upstream."
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          "text": "A cache poisoning vulnerability was found in BIND when using forwarders. Bogus NS records supplied by the forwarders may be cached and used by name if it needs to recurse for any reason. This issue causes it to obtain and pass on potentially incorrect answers. This flaw allows a remote high privileged attacker to manipulate cache results with incorrect records, leading to queries made to the wrong servers, possibly resulting in false information received on the client\u0027s end.",
          "title": "Vulnerability description"
        },
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          "text": "bind: DNS forwarders - cache poisoning vulnerability",
          "title": "Vulnerability summary"
        },
        {
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          "text": "Versions of BIND shipped with Red Hat Enterprise Linux 8, 9 are affected, because vulnerable code is present in our code base.\n\nFor RHEL-9, DHCP uses the vulnerable BIND 9 libraries (bind-9.11.14) for some services. Hence, it is affected as well.\n\nAuthoritative - Only BIND 9 servers are not vulnerable to this flaw.",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-25220"
        },
        {
          "category": "external",
          "summary": "RHBZ#2064512",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2064512"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-25220",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-25220"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-25220",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25220"
        },
        {
          "category": "external",
          "summary": "https://kb.isc.org/docs/CVE-2021-25220",
          "url": "https://kb.isc.org/docs/CVE-2021-25220"
        }
      ],
      "release_date": "2022-03-16T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2022-11-15T09:56:38+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": {
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          "url": "https://access.redhat.com/errata/RHSA-2022:8385"
        },
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      "scores": [
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N",
            "version": "3.1"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "bind: DNS forwarders - cache poisoning vulnerability"
    }
  ]
}


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