csaf_redhat - rhsa-2021

rhsa-2021_2418

Vulnerability from csaf_redhat

Published

2021-06-14 19:33

Modified

2024-11-15 11:51

Summary

Red Hat Security Advisory: dhcp security update

Notes

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 7.2 Advanced 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 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): * dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient (CVE-2021-25217) 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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        "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* dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient (CVE-2021-25217)\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.",
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        {
          "category": "description",
          "text": "A flaw was found in the Dynamic Host Configuration Protocol (DHCP). There is a discrepancy between the code that handles encapsulated option information in leases transmitted \"on the wire\" and the code which reads and parses lease information after it has been written to disk storage. This flaw allows an attacker to deliberately cause a situation where dhcpd while running in DHCPv4 or DHCPv6 mode, or the dhclient attempts to read a stored lease that contains option information, to trigger a stack-based buffer overflow in the option parsing code for colon-separated hex digits values. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "To abuse this flaw an attacker has to be on the same local sub-net of the victim machine. An attacker may send crafted DHCP messages with long lease statements that, when stored locally on file and then re-read by dhclient or dhcpd, might trigger the bug.",
          "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": {
        "fixed": [
          "7Server-7.2.AUS:dhclient-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.src",
          "7Server-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.x86_64",
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          "7Server-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.i686",
          "7Server-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-7.2.AUS:dhcp-devel-12:4.2.5-42.el7_2.2.i686",
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          "7Server-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.i686",
          "7Server-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-optional-7.2.AUS:dhclient-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-optional-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.src",
          "7Server-optional-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-optional-7.2.AUS:dhcp-common-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-optional-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.i686",
          "7Server-optional-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-optional-7.2.AUS:dhcp-devel-12:4.2.5-42.el7_2.2.i686",
          "7Server-optional-7.2.AUS:dhcp-devel-12:4.2.5-42.el7_2.2.x86_64",
          "7Server-optional-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.i686",
          "7Server-optional-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-25217"
        },
        {
          "category": "external",
          "summary": "RHBZ#1963258",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1963258"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-25217",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-25217"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-25217",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25217"
        },
        {
          "category": "external",
          "summary": "https://kb.isc.org/docs/cve-2021-25217",
          "url": "https://kb.isc.org/docs/cve-2021-25217"
        }
      ],
      "release_date": "2021-05-26T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-06-14T19:33:00+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",
          "product_ids": [
            "7Server-7.2.AUS:dhclient-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.src",
            "7Server-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-7.2.AUS:dhcp-common-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.i686",
            "7Server-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-7.2.AUS:dhcp-devel-12:4.2.5-42.el7_2.2.i686",
            "7Server-7.2.AUS:dhcp-devel-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.i686",
            "7Server-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-optional-7.2.AUS:dhclient-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-optional-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.src",
            "7Server-optional-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-optional-7.2.AUS:dhcp-common-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-optional-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.i686",
            "7Server-optional-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.x86_64",
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            "7Server-optional-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:2418"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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            "7Server-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.src",
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            "7Server-optional-7.2.AUS:dhclient-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-optional-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.src",
            "7Server-optional-7.2.AUS:dhcp-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-optional-7.2.AUS:dhcp-common-12:4.2.5-42.el7_2.2.x86_64",
            "7Server-optional-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.i686",
            "7Server-optional-7.2.AUS:dhcp-debuginfo-12:4.2.5-42.el7_2.2.x86_64",
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            "7Server-optional-7.2.AUS:dhcp-devel-12:4.2.5-42.el7_2.2.x86_64",
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            "7Server-optional-7.2.AUS:dhcp-libs-12:4.2.5-42.el7_2.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient"
    }
  ]
}

cve-2021-25217

Vulnerability from cvelistv5

Published

2021-05-26 22:10

Modified

2024-09-16 22:08

Severity ?

7.4 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Summary

In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.

References

▼	URL	Tags
	https://kb.isc.org/docs/cve-2021-25217
	http://www.openwall.com/lists/oss-security/2021/05/26/6	mailing-list
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/	vendor-advisory
	https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html	mailing-list
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/	vendor-advisory
	https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf
	https://security.netapp.com/advisory/ntap-20220325-0011/
	https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
	https://security.gentoo.org/glsa/202305-22	vendor-advisory

Impacted products

Vendor

Product

Version

▼

ISC

ISC DHCP

Version: 4.1 ESV < 4.1-ESV-R16-P1
Version: 4.4 < 4.4.2-P1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T19:56:11.067Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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              "x_transferred"
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/"
          },
          {
            "name": "[debian-lts-announce] 20210603 [SECURITY] [DLA 2674-1] isc-dhcp security update",
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              "mailing-list",
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            "url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html"
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          {
            "name": "FEDORA-2021-8ca8263bde",
            "tags": [
              "vendor-advisory",
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/"
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              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202305-22"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ISC DHCP",
          "vendor": "ISC",
          "versions": [
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              "version": "4.4",
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      "credits": [
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          "lang": "en",
          "value": "ISC would like to thank Jon Franklin from Dell and Pawel Wieczorkiewicz from Amazon Web Services for (independently) reporting this vulnerability."
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        }
      ],
      "exploits": [
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          "lang": "en",
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      ],
      "solutions": [
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          "lang": "en",
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        }
      ],
      "source": {
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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