csaf_redhat - rhsa-2021

rhsa-2021_0151

Vulnerability from csaf_redhat

Published

2021-01-19 13:37

Modified

2024-11-15 07:27

Summary

Red Hat Security Advisory: dnsmasq security update

Notes

Topic

An update for dnsmasq is now available for Red Hat Enterprise Linux 8.2 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 Fix(es): * dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled (CVE-2020-25681) * dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled (CVE-2020-25682) * dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled (CVE-2020-25683) * dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684) * dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685) * dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686) * dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled (CVE-2020-25687) 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.

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": "Vulnerability description"
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          "text": "dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled",
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          "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.",
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          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Moshe Kol",
            "Shlomi Oberman"
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        {
          "category": "description",
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
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          "title": "Statement"
        },
        {
          "category": "general",
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            "attackVector": "NETWORK",
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            "baseScore": 8.1,
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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      "title": "dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Moshe Kol",
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          "title": "Vulnerability description"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Moshe Kol",
            "Shlomi Oberman"
          ],
          "organization": "JSOF"
        }
      ],
      "cve": "CVE-2020-25684",
      "cwe": {
        "id": "CWE-358",
        "name": "Improperly Implemented Security Check for Standard"
      },
      "discovery_date": "2020-09-03T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1889686"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dnsmasq. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query\u0027s attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Dnsmasq may be run by libvirt and/or NetworkManager. libvirt uses dnsmasq by default to provide DNS service to its guests. NetworkManager may be configured to use dnsmasq to provide DNS service to the system, if a line `dns=dnsmasq` is present in the `[main]` section of the configuration file /etc/NetworkManager/NetworkManager.conf.\n\nIn Red Hat OpenStack Platform (RHOSP) and Red Hat Virtualization (RHV), the dnsmasq package is provided by the underlying Red Hat Enterprise Linux (RHEL) product. RHOSP and RHV are therefore indirectly affected, so please ensure that the underlying RHEL dnsmasq package is updated.",
          "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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-25684"
        },
        {
          "category": "external",
          "summary": "RHBZ#1889686",
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-25684",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-25684"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-25684",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25684"
        },
        {
          "category": "external",
          "summary": "https://www.jsof-tech.com/disclosures/dnspooq/",
          "url": "https://www.jsof-tech.com/disclosures/dnspooq/"
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      "release_date": "2021-01-19T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2021-01-19T13:37:11+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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            "baseScore": 4.0,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Moshe Kol",
            "Shlomi Oberman"
          ],
          "organization": "JSOF"
        }
      ],
      "cve": "CVE-2020-25685",
      "cwe": {
        "id": "CWE-326",
        "name": "Inadequate Encryption Strength"
      },
      "discovery_date": "2020-09-03T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1889688"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dnsmasq. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Dnsmasq may be run by libvirt and/or NetworkManager. libvirt uses dnsmasq by default to provide DNS service to its guests. NetworkManager may be configured to use dnsmasq to provide DNS service to the system, if a line `dns=dnsmasq` is present in the `[main]` section of the configuration file /etc/NetworkManager/NetworkManager.conf.\n\nIn Red Hat OpenStack Platform (RHOSP) and Red Hat Virtualization (RHV), the dnsmasq package is provided by the underlying Red Hat Enterprise Linux (RHEL) product. RHOSP and RHV are therefore indirectly affected, so please ensure that the underlying RHEL dnsmasq package is updated.",
          "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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      "references": [
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-25685"
        },
        {
          "category": "external",
          "summary": "RHBZ#1889688",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1889688"
        },
        {
          "category": "external",
          "summary": "RHSB-2021-001",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2021-001"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-25685",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-25685"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-25685",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25685"
        },
        {
          "category": "external",
          "summary": "https://www.jsof-tech.com/disclosures/dnspooq/",
          "url": "https://www.jsof-tech.com/disclosures/dnspooq/"
        }
      ],
      "release_date": "2021-01-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-01-19T13:37:11+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"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:0151"
        },
        {
          "category": "workaround",
          "details": "The impact of this flaw can be reduced by disabling the dnsmasq cache by adding `--cache-size=0` when calling dnsmasq or by adding a line with `cache-size=0` to the dnsmasq configuration file (/etc/dnsmasq.conf by default). \n\nWhen using Red Hat Enterprise Linux 8.3 with libvirt through a virt:rhel module, use `virsh net-edit \u003cnetwork-name\u003e` and reference https://libvirt.org/formatnetwork.html#elementsNamespaces to add the suggested option `cache-size=0`. \n\nThere is no way to customize the dnsmasq configuration generated by libvirt, when using versions of Red Hat Enterprise Linux prior to version 8.3. If dnsmasq is being run through NetworkManager, create a new file in /etc/NetworkManager/dnsmasq.d/ and add `cache-size=0` to it.\n\nIn all cases, by disabling the cache, you may experience a performance loss in your environment due to all DNS queries being forwarded to the upstream servers. Please evaluate if the mitigation is appropriate for the system\u2019s environment before applying.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Moshe Kol",
            "Shlomi Oberman"
          ],
          "organization": "JSOF"
        }
      ],
      "cve": "CVE-2020-25686",
      "cwe": {
        "id": "CWE-290",
        "name": "Authentication Bypass by Spoofing"
      },
      "discovery_date": "2020-09-03T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1890125"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dnsmasq. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Dnsmasq may be run by libvirt and/or NetworkManager. libvirt uses dnsmasq by default to provide DNS service to its guests. NetworkManager may be configured to use dnsmasq to provide DNS service to the system, if a line `dns=dnsmasq` is present in the `[main]` section of the configuration file /etc/NetworkManager/NetworkManager.conf.\n\nIn Red Hat OpenStack Platform (RHOSP) and Red Hat Virtualization (RHV), the dnsmasq package is provided by the underlying Red Hat Enterprise Linux (RHEL) product. RHOSP and RHV are therefore indirectly affected, so please ensure that the underlying RHEL dnsmasq package is updated.",
          "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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        },
        {
          "category": "external",
          "summary": "RHBZ#1890125",
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          "category": "external",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25686"
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          "category": "external",
          "summary": "https://www.jsof-tech.com/disclosures/dnspooq/",
          "url": "https://www.jsof-tech.com/disclosures/dnspooq/"
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      "release_date": "2021-01-19T00:00:00+00:00",
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          "date": "2021-01-19T13:37:11+00:00",
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            "baseScore": 4.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Moshe Kol",
            "Shlomi Oberman"
          ],
          "organization": "JSOF"
        }
      ],
      "cve": "CVE-2020-25687",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "discovery_date": "2020-09-03T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1891568"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dnsmasq. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service.  The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect the versions of dnsmasq as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they are not compiled with DNSSEC support.",
          "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": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-8.2.0.Z.EUS:dnsmasq-0:2.79-11.el8_2.2.aarch64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-0:2.79-11.el8_2.2.ppc64le",
            "AppStream-8.2.0.Z.EUS:dnsmasq-0:2.79-11.el8_2.2.s390x",
            "AppStream-8.2.0.Z.EUS:dnsmasq-0:2.79-11.el8_2.2.src",
            "AppStream-8.2.0.Z.EUS:dnsmasq-0:2.79-11.el8_2.2.x86_64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debuginfo-0:2.79-11.el8_2.2.aarch64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debuginfo-0:2.79-11.el8_2.2.ppc64le",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debuginfo-0:2.79-11.el8_2.2.s390x",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debuginfo-0:2.79-11.el8_2.2.x86_64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debugsource-0:2.79-11.el8_2.2.aarch64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debugsource-0:2.79-11.el8_2.2.ppc64le",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debugsource-0:2.79-11.el8_2.2.s390x",
            "AppStream-8.2.0.Z.EUS:dnsmasq-debugsource-0:2.79-11.el8_2.2.x86_64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-0:2.79-11.el8_2.2.aarch64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-0:2.79-11.el8_2.2.ppc64le",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-0:2.79-11.el8_2.2.s390x",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-0:2.79-11.el8_2.2.x86_64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-debuginfo-0:2.79-11.el8_2.2.aarch64",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-debuginfo-0:2.79-11.el8_2.2.ppc64le",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-debuginfo-0:2.79-11.el8_2.2.s390x",
            "AppStream-8.2.0.Z.EUS:dnsmasq-utils-debuginfo-0:2.79-11.el8_2.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled"
    }
  ]
}

cve-2020-25685

Vulnerability from cvelistv5

Published

2021-01-20 00:00

Modified

2024-08-04 15:40

Severity ?

Summary

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

References

▼	URL	Tags
	https://www.jsof-tech.com/disclosures/dnspooq/
	https://bugzilla.redhat.com/show_bug.cgi?id=1889688
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory
	https://security.gentoo.org/glsa/202101-17	vendor-advisory
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory
	https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61

Impacted products

▼	Vendor	Product
	n/a	dnsmasq

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
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          "lang": "en",
          "value": "A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity."
        }
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          "name": "DSA-4844",
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cve-2020-25683

Vulnerability from cvelistv5

Published

2021-01-20 15:25

Modified

2024-08-04 15:40

Severity ?

Summary

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

References

▼	URL	Tags
	https://www.jsof-tech.com/disclosures/dnspooq/	x_refsource_MISC
	https://bugzilla.redhat.com/show_bug.cgi?id=1882018	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202101-17	vendor-advisory, x_refsource_GENTOO
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory, x_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html	mailing-list, x_refsource_MLIST

Impacted products

▼	Vendor	Product
	n/a	dnsmasq

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T15:40:36.769Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "tags": [
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            "url": "https://www.jsof-tech.com/disclosures/dnspooq/"
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            "tags": [
              "vendor-advisory",
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              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/"
          },
          {
            "name": "GLSA-202101-17",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202101-17"
          },
          {
            "name": "DSA-4844",
            "tags": [
              "vendor-advisory",
              "x_refsource_DEBIAN",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2021/dsa-4844"
          },
          {
            "name": "FEDORA-2021-2e4c3d5a9d",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"
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          {
            "name": "[debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update",
            "tags": [
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        {
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          "tags": [
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            "x_refsource_GENTOO"
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          "url": "https://security.gentoo.org/glsa/202101-17"
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    "datePublished": "2021-01-20T15:25:04",
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cve-2020-25684

Vulnerability from cvelistv5

Published

2021-01-20 15:22

Modified

2024-08-04 15:40

Severity ?

Summary

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

References

▼	URL	Tags
	https://bugzilla.redhat.com/show_bug.cgi?id=1889686	x_refsource_MISC
	https://www.jsof-tech.com/disclosures/dnspooq/	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202101-17	vendor-advisory, x_refsource_GENTOO
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory, x_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html	mailing-list, x_refsource_MLIST
	https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61	x_refsource_MISC

Impacted products

▼	Vendor	Product
	n/a	dnsmasq

Show details on NVD website

JSON

To clipboard

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cve-2020-25686

Vulnerability from cvelistv5

Published

2021-01-20 16:47

Modified

2024-08-04 15:40

Severity ?

Summary

A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

References

▼	URL	Tags
	https://www.jsof-tech.com/disclosures/dnspooq/	x_refsource_MISC
	https://bugzilla.redhat.com/show_bug.cgi?id=1890125	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202101-17	vendor-advisory, x_refsource_GENTOO
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory, x_refsource_FEDORA
	https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61	x_refsource_MISC

Impacted products

▼	Vendor	Product
	n/a	dnsmasq

Show details on NVD website

JSON

To clipboard

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cve-2020-25681

Vulnerability from cvelistv5

Published

2021-01-20 16:36

Modified

2024-08-04 15:40

Severity ?

Summary

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

References

▼	URL	Tags
	https://www.jsof-tech.com/disclosures/dnspooq/	x_refsource_MISC
	https://bugzilla.redhat.com/show_bug.cgi?id=1881875	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202101-17	vendor-advisory, x_refsource_GENTOO
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory, x_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html	mailing-list, x_refsource_MLIST

Impacted products

▼	Vendor	Product
	n/a	dnsmasq

Show details on NVD website

JSON

To clipboard

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cve-2020-25687

Vulnerability from cvelistv5

Published

2021-01-20 16:31

Modified

2024-08-04 15:40

Severity ?

Summary

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

References

▼	URL	Tags
	https://www.jsof-tech.com/disclosures/dnspooq/	x_refsource_MISC
	https://bugzilla.redhat.com/show_bug.cgi?id=1891568	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202101-17	vendor-advisory, x_refsource_GENTOO
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory, x_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html	mailing-list, x_refsource_MLIST

Impacted products

▼	Vendor	Product
	n/a	dnsmasq

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
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          {
            "name": "GLSA-202101-17",
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/"
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            "name": "[debian-lts-announce] 20210322 [SECURITY] [DLA 2604-1] dnsmasq security update",
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cve-2020-25682

Vulnerability from cvelistv5

Published

2021-01-20 16:28

Modified

2024-08-04 15:40

Severity ?

Summary

A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

References

▼	URL	Tags
	https://www.jsof-tech.com/disclosures/dnspooq/	x_refsource_MISC
	https://bugzilla.redhat.com/show_bug.cgi?id=1882014	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202101-17	vendor-advisory, x_refsource_GENTOO
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory, x_refsource_FEDORA
	https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html	mailing-list, x_refsource_MLIST

Impacted products

▼	Vendor	Product
	n/a	dnsmasq

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

Vulnerability from csaf_redhat

Vulnerability from cvelistv5

Vulnerability from cvelistv5

Vulnerability from cvelistv5

Vulnerability from cvelistv5

Vulnerability from cvelistv5

Vulnerability from cvelistv5

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature