rhsa-2009_1238
Vulnerability from csaf_redhat
Published
2009-09-01 00:18
Modified
2024-11-22 02:58
Summary
Red Hat Security Advisory: dnsmasq security update

Notes

Topic
An updated dnsmasq package that fixes two security issues is now available for Red Hat Enterprise Linux 5. This update has been rated as having important security impact by the Red Hat Security Response Team.
Details
Dnsmasq is a lightweight and easy to configure DNS forwarder and DHCP server. Core Security Technologies discovered a heap overflow flaw in dnsmasq when the TFTP service is enabled (the "--enable-tftp" command line option, or by enabling "enable-tftp" in "/etc/dnsmasq.conf"). If the configured tftp-root is sufficiently long, and a remote user sends a request that sends a long file name, dnsmasq could crash or, possibly, execute arbitrary code with the privileges of the dnsmasq service (usually the unprivileged "nobody" user). (CVE-2009-2957) A NULL pointer dereference flaw was discovered in dnsmasq when the TFTP service is enabled. This flaw could allow a malicious TFTP client to crash the dnsmasq service. (CVE-2009-2958) Note: The default tftp-root is "/var/ftpd", which is short enough to make it difficult to exploit the CVE-2009-2957 issue; if a longer directory name is used, arbitrary code execution may be possible. As well, the dnsmasq package distributed by Red Hat does not have TFTP support enabled by default. All users of dnsmasq should upgrade to this updated package, which contains a backported patch to correct these issues. After installing the updated package, the dnsmasq service must be restarted for the update to take effect.
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": "Dnsmasq is a lightweight and easy to configure DNS forwarder and DHCP\nserver.\n\nCore Security Technologies discovered a heap overflow flaw in dnsmasq when\nthe TFTP service is enabled (the \"--enable-tftp\" command line option, or by\nenabling \"enable-tftp\" in \"/etc/dnsmasq.conf\"). If the configured tftp-root\nis sufficiently long, and a remote user sends a request that sends a long\nfile name, dnsmasq could crash or, possibly, execute arbitrary code with\nthe privileges of the dnsmasq service (usually the unprivileged \"nobody\"\nuser). (CVE-2009-2957)\n\nA NULL pointer dereference flaw was discovered in dnsmasq when the TFTP\nservice is enabled. This flaw could allow a malicious TFTP client to crash\nthe dnsmasq service. (CVE-2009-2958)\n\nNote: The default tftp-root is \"/var/ftpd\", which is short enough to make\nit difficult to exploit the CVE-2009-2957 issue; if a longer directory name\nis used, arbitrary code execution may be possible. As well, the dnsmasq\npackage distributed by Red Hat does not have TFTP support enabled by\ndefault.\n\nAll users of dnsmasq should upgrade to this updated package, which contains\na backported patch to correct these issues. After installing the updated\npackage, the dnsmasq service must be restarted for the update to take\neffect.",
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          "name": "dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64 as a component of Red Hat Enterprise Linux (v. 5 server)",
          "product_id": "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64"
        },
        "product_reference": "dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64",
        "relates_to_product_reference": "5Server"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2009-2957",
      "discovery_date": "2009-08-23T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "519020"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Heap-based buffer overflow in the tftp_request function in tftp.c in dnsmasq before 2.50, when --enable-tftp is used, might allow remote attackers to execute arbitrary code via a long filename in a TFTP packet, as demonstrated by a read (aka RRQ) request.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: multiple vulnerabilities in TFTP server",
          "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": {
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          "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2009-2957"
        },
        {
          "category": "external",
          "summary": "RHBZ#519020",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=519020"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2009-2957",
          "url": "https://www.cve.org/CVERecord?id=CVE-2009-2957"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2009-2957",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2009-2957"
        }
      ],
      "release_date": "2009-08-31T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2009-09-01T00:18:00+00:00",
          "details": "Before applying this update, make sure that all previously-released\nerrata relevant to your system have been applied.\n\nThis update is available via Red Hat Network.  Details on how to use\nthe Red Hat Network to apply this update are available at\nhttp://kbase.redhat.com/faq/docs/DOC-11259",
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            "5Client:dnsmasq-0:2.45-1.1.el5_3.ia64",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.ppc",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.s390x",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.src",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.x86_64",
            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.i386",
            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.ia64",
            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.ppc",
            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.s390x",
            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.i386",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.ia64",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.ppc",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.s390x",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.src",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.x86_64",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.i386",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.ia64",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.ppc",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.s390x",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2009:1238"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "products": [
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            "5Client:dnsmasq-0:2.45-1.1.el5_3.ia64",
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            "5Client:dnsmasq-0:2.45-1.1.el5_3.s390x",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.src",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.x86_64",
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            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.ppc",
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            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64",
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            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dnsmasq: multiple vulnerabilities in TFTP server"
    },
    {
      "cve": "CVE-2009-2958",
      "discovery_date": "2009-08-23T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "519020"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The tftp_request function in tftp.c in dnsmasq before 2.50, when --enable-tftp is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a TFTP read (aka RRQ) request with a malformed blksize option.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: multiple vulnerabilities in TFTP server",
          "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": {
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      },
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2009-2958"
        },
        {
          "category": "external",
          "summary": "RHBZ#519020",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=519020"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2009-2958",
          "url": "https://www.cve.org/CVERecord?id=CVE-2009-2958"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2009-2958",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2009-2958"
        }
      ],
      "release_date": "2009-08-31T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2009-09-01T00:18:00+00:00",
          "details": "Before applying this update, make sure that all previously-released\nerrata relevant to your system have been applied.\n\nThis update is available via Red Hat Network.  Details on how to use\nthe Red Hat Network to apply this update are available at\nhttp://kbase.redhat.com/faq/docs/DOC-11259",
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          ],
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          "url": "https://access.redhat.com/errata/RHSA-2009:1238"
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      ],
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        {
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            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
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            "5Client:dnsmasq-0:2.45-1.1.el5_3.ia64",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.ppc",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.s390x",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.src",
            "5Client:dnsmasq-0:2.45-1.1.el5_3.x86_64",
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            "5Client:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.i386",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.ia64",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.ppc",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.s390x",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.src",
            "5Server:dnsmasq-0:2.45-1.1.el5_3.x86_64",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.i386",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.ia64",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.ppc",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.s390x",
            "5Server:dnsmasq-debuginfo-0:2.45-1.1.el5_3.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dnsmasq: multiple vulnerabilities in TFTP server"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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