rhsa-2015_0042
Vulnerability from csaf_redhat
Published
2015-01-13 20:24
Modified
2024-11-14 13:12
Summary
Red Hat Security Advisory: cloud-init security, bug fix, and enhancement update

Notes

Topic
Updated cloud-init packages that fix one security issue, several bugs, and add various enhancements are now available for Red Hat Common for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having Low 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 cloud-init packages provide a set of init scripts for cloud instances. Cloud instances need special scripts to run during initialization to retrieve and install ssh keys and to let the user run various scripts. A denial of service flaw was found in the way Python's SSL module implementation performed matching of certain certificate names. A remote attacker able to obtain a valid certificate that contained multiple wildcard characters could use this flaw to issue a request to validate such a certificate, resulting in excessive consumption of CPU. (CVE-2013-2099) This issue was discovered by Florian Weimer of Red Hat Product Security. The cloud-init packages have been upgraded to upstream version 0.7.5, which provides a number of bug fixes and enhancements over the previous version. (BZ#1111709, BZ#1119334) All cloud-init users are advised to upgrade to these updated packages, which correct these issues and add these enhancements.
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 cloud-init packages that fix one security issue, several bugs, and\nadd various enhancements are now available for Red Hat Common for Red Hat\nEnterprise Linux 6.\n\nRed Hat Product Security has rated this update as having Low security\nimpact. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available from the CVE link in the\nReferences section.",
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        "text": "The cloud-init packages provide a set of init scripts for cloud instances.\nCloud instances need special scripts to run during initialization to\nretrieve and install ssh keys and to let the user run various scripts.\n\nA denial of service flaw was found in the way Python\u0027s SSL module\nimplementation performed matching of certain certificate names. A remote\nattacker able to obtain a valid certificate that contained multiple\nwildcard characters could use this flaw to issue a request to validate such\na certificate, resulting in excessive consumption of CPU. (CVE-2013-2099)\n\nThis issue was discovered by Florian Weimer of Red Hat Product Security.\n\nThe cloud-init packages have been upgraded to upstream version 0.7.5, which\nprovides a number of bug fixes and enhancements over the previous version.\n(BZ#1111709, BZ#1119334)\n\nAll cloud-init users are advised to upgrade to these updated packages,\nwhich correct these issues and add these enhancements.",
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Florian Weimer"
          ],
          "organization": "Red Hat Product Security",
          "summary": "This issue was discovered by Red Hat."
        }
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      "cve": "CVE-2013-2099",
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          "text": "963260"
        }
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        {
          "category": "description",
          "text": "A denial of service flaw was found in the way Python\u0027s SSL module implementation performed matching of certain certificate names. A remote attacker able to obtain a valid certificate that contained multiple wildcard characters could use this flaw to issue a request to validate such a certificate, resulting in excessive consumption of CPU.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python: ssl.match_hostname() DoS via certificates with specially crafted hostname wildcard patterns",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did not affect the versions of python as shipped with Red Hat Enterprise Linux 5 and 6 as the SSL module there did not implement the match_hostname() routine yet.",
          "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-2013-2099"
        },
        {
          "category": "external",
          "summary": "RHBZ#963260",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=963260"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2013-2099",
          "url": "https://www.cve.org/CVERecord?id=CVE-2013-2099"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2013-2099",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2013-2099"
        }
      ],
      "release_date": "2013-05-15T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2015-01-13T20:24:32+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 use the\nRed Hat Network to apply this update are available at\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2015:0042"
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      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "HIGH",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 2.6,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:H/Au:N/C:N/I:N/A:P",
            "version": "2.0"
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "python: ssl.match_hostname() DoS via certificates with specially crafted hostname wildcard patterns"
    }
  ]
}


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