rhsa-2011_0840
Vulnerability from csaf_redhat
Published
2011-05-31 14:48
Modified
2024-11-22 04:17
Summary
Red Hat Security Advisory: dhcp security update

Notes

Topic
Updated dhcp packages that fix one security issue are now available for Red Hat Enterprise Linux 3 Extended Life Cycle Support. The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link 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. It was discovered that the DHCP client daemon, dhclient, did not sufficiently sanitize certain options provided in DHCP server replies, such as the client hostname. A malicious DHCP server could send such an option with a specially-crafted value to a DHCP client. If this option's value was saved on the client system, and then later insecurely evaluated by a process that assumes the option is trusted, it could lead to arbitrary code execution with the privileges of that process. (CVE-2011-0997) Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for reporting this issue. All dhclient users should upgrade to these updated packages, which contain a backported patch to correct this issue.
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.


To clipboard 

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        "text": "Updated dhcp packages that fix one security issue are now available for\nRed Hat Enterprise Linux 3 Extended Life Cycle Support.\n\nThe Red Hat Security Response Team has rated this update as having\nimportant security impact. A Common Vulnerability Scoring System (CVSS)\nbase score, which gives a detailed severity rating, is available from the\nCVE link in the References section.",
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        "text": "The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows\nindividual devices on an IP network to get their own network configuration\ninformation, including an IP address, a subnet mask, and a broadcast\naddress.\n\nIt was discovered that the DHCP client daemon, dhclient, did not\nsufficiently sanitize certain options provided in DHCP server replies, such\nas the client hostname. A malicious DHCP server could send such an option\nwith a specially-crafted value to a DHCP client. If this option\u0027s value was\nsaved on the client system, and then later insecurely evaluated by a\nprocess that assumes the option is trusted, it could lead to arbitrary code\nexecution with the privileges of that process. (CVE-2011-0997)\n\nRed Hat would like to thank Sebastian Krahmer of the SuSE Security Team for\nreporting this issue.\n\nAll dhclient users should upgrade to these updated packages, which contain\na backported patch to correct this issue.",
        "title": "Details"
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    {
      "acknowledgments": [
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          "names": [
            "Sebastian Krahmer"
          ],
          "organization": "SuSE Security Team"
        }
      ],
      "cve": "CVE-2011-0997",
      "cwe": {
        "id": "CWE-78",
        "name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
      },
      "discovery_date": "2011-03-18T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "689832"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote attackers to execute arbitrary commands via shell metacharacters in a hostname obtained from a DHCP message, as demonstrated by a hostname that is provided to dhclient-script.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dhclient: insufficient sanitization of certain DHCP response values",
          "title": "Vulnerability summary"
        },
        {
          "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": [
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          "3AS-ELS:dhcp-7:3.0.1-10.3_EL3.i386",
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2011-0997",
          "url": "https://www.cve.org/CVERecord?id=CVE-2011-0997"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-0997",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2011-0997"
        }
      ],
      "release_date": "2011-04-05T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2011-05-31T14:48:00+00:00",
          "details": "Before applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259",
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          "restart_required": {
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      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "ADJACENT_NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 7.9,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:A/AC:M/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
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            "3AS-ELS:dhcp-7:3.0.1-10.3_EL3.i386",
            "3AS-ELS:dhcp-7:3.0.1-10.3_EL3.src",
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            "3AS-ELS:dhcp-devel-7:3.0.1-10.3_EL3.i386",
            "3ES-ELS:dhclient-7:3.0.1-10.3_EL3.i386",
            "3ES-ELS:dhcp-7:3.0.1-10.3_EL3.i386",
            "3ES-ELS:dhcp-7:3.0.1-10.3_EL3.src",
            "3ES-ELS:dhcp-debuginfo-7:3.0.1-10.3_EL3.i386",
            "3ES-ELS:dhcp-devel-7:3.0.1-10.3_EL3.i386"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dhclient: insufficient sanitization of certain DHCP response values"
    }
  ]
}


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