rhsa-2019_2870
Vulnerability from csaf_redhat
Published
2019-09-23 12:59
Modified
2024-11-05 21:26
Summary
Red Hat Security Advisory: dbus security update

Notes

Topic
An update for dbus is now available for Red Hat Enterprise Linux 6.5 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
D-Bus is a system for sending messages between applications. It is used both for the system-wide message bus service, and as a per-user-login-session messaging facility. Security Fix(es): * dbus: DBusServer DBUS_COOKIE_SHA1 authentication bypass (CVE-2019-12749) 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.
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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  "vulnerabilities": [
    {
      "acknowledgments": [
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            "the D-Bus project"
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        {
          "names": [
            "Joe Vennix"
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          "organization": "Apple Information Security",
          "summary": "Acknowledged by upstream."
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        "name": "Improper Authentication"
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          "text": "1719344"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in dbus. The implementation of DBUS_COOKIE_SHA1 is susceptible to a symbolic link attack. A malicious client with write access to its own home directory could manipulate a ~/.dbus-keyrings symlink to cause the DBusServer to read and write in unintended locations resulting in an authentication bypass. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dbus: DBusServer DBUS_COOKIE_SHA1 authentication bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is mitigated by the fact that by default, the well-known system dbus-daemon (since 2003) and the well-known session dbus-daemon (in stable releases since dbus 1.10.0 in 2015) only accept the EXTERNAL authentication mechanism, and as a result will reject DBUS_COOKIE_SHA1 at an early stage, before manipulating cookies. \n\nRed Hat Enterprise Linux 6 is affected by this flaw, which can be leveraged to achieve privilege escalation via upstart.  This issue has been rated as having important impact for Red Hat Enterprise Linux 6.\n\nRed Hat Enterprise Linux 7 and 8, both ship dbus \u003e= 1.10 and therefore are affected by this flaw only when system or session dbus-daemons are used under non-standard configurations or by third party users of DBusServer.  Red Hat Enterprise Linux 7 and 8 does not ship any affected DBusServer cosumer. However third party applications may be affected.",
          "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": [
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          "6Server-optional-6.5.AUS:dbus-1:1.2.24-9.el6_5.src",
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          "6Server-optional-6.5.AUS:dbus-libs-1:1.2.24-9.el6_5.x86_64",
          "6Server-optional-6.5.AUS:dbus-x11-1:1.2.24-9.el6_5.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-12749"
        },
        {
          "category": "external",
          "summary": "RHBZ#1719344",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1719344"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-12749",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-12749"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-12749",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-12749"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2019/06/11/2",
          "url": "https://www.openwall.com/lists/oss-security/2019/06/11/2"
        }
      ],
      "release_date": "2019-06-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2019-09-23T12:59:22+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\n\nFor the update to take effect, all running instances of dbus-daemon and all running applications using the libdbus library must be restarted, or the system rebooted.",
          "product_ids": [
            "6Server-6.5.AUS:dbus-1:1.2.24-9.el6_5.src",
            "6Server-6.5.AUS:dbus-1:1.2.24-9.el6_5.x86_64",
            "6Server-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.i686",
            "6Server-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.x86_64",
            "6Server-6.5.AUS:dbus-devel-1:1.2.24-9.el6_5.i686",
            "6Server-6.5.AUS:dbus-devel-1:1.2.24-9.el6_5.x86_64",
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            "6Server-6.5.AUS:dbus-libs-1:1.2.24-9.el6_5.x86_64",
            "6Server-6.5.AUS:dbus-x11-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-1:1.2.24-9.el6_5.src",
            "6Server-optional-6.5.AUS:dbus-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.i686",
            "6Server-optional-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-devel-1:1.2.24-9.el6_5.i686",
            "6Server-optional-6.5.AUS:dbus-devel-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-doc-1:1.2.24-9.el6_5.noarch",
            "6Server-optional-6.5.AUS:dbus-libs-1:1.2.24-9.el6_5.i686",
            "6Server-optional-6.5.AUS:dbus-libs-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-x11-1:1.2.24-9.el6_5.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2019:2870"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "6Server-6.5.AUS:dbus-1:1.2.24-9.el6_5.src",
            "6Server-6.5.AUS:dbus-1:1.2.24-9.el6_5.x86_64",
            "6Server-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.i686",
            "6Server-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.x86_64",
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            "6Server-6.5.AUS:dbus-x11-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-1:1.2.24-9.el6_5.src",
            "6Server-optional-6.5.AUS:dbus-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.i686",
            "6Server-optional-6.5.AUS:dbus-debuginfo-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-devel-1:1.2.24-9.el6_5.i686",
            "6Server-optional-6.5.AUS:dbus-devel-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-doc-1:1.2.24-9.el6_5.noarch",
            "6Server-optional-6.5.AUS:dbus-libs-1:1.2.24-9.el6_5.i686",
            "6Server-optional-6.5.AUS:dbus-libs-1:1.2.24-9.el6_5.x86_64",
            "6Server-optional-6.5.AUS:dbus-x11-1:1.2.24-9.el6_5.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dbus: DBusServer DBUS_COOKIE_SHA1 authentication bypass"
    }
  ]
}


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