rhsa-2021_4844
Vulnerability from csaf_redhat
Published
2021-11-29 12:38
Modified
2024-11-15 07:34
Summary
Red Hat Security Advisory: samba security update

Notes

Topic
An update for samba is now available for Red Hat Gluster Storage 3.5 for Red Hat Enterprise Linux 7. 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
Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information. Security Fix(es): * samba: SMB1 client connections can be downgraded to plaintext authentication (CVE-2016-2124) * samba: A user in an AD Domain could become root on domain members (CVE-2020-25717) 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. All users of Samba with Red Hat Gluster Storage are advised to upgrade to these updated packages.
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": "An update for samba is now available for Red Hat Gluster Storage 3.5 for Red Hat Enterprise Linux 7.\n\nRed 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.",
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        "text": "Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.\n\nSecurity Fix(es):\n\n* samba: SMB1 client connections can be downgraded to plaintext authentication (CVE-2016-2124)\n\n* samba: A user in an AD Domain could become root on domain members (CVE-2020-25717)\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.\n\nAll users of Samba with Red Hat Gluster Storage are advised to upgrade to these updated packages.",
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    {
      "acknowledgments": [
        {
          "names": [
            "Stefan Metzmacher"
          ],
          "organization": "SerNet"
        },
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          "names": [
            "the Samba project"
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          "summary": "Acknowledged by upstream."
        }
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      "cwe": {
        "id": "CWE-287",
        "name": "Improper Authentication"
      },
      "discovery_date": "2021-11-03T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2019660"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to retrieve the plaintext password sent over the wire even if Kerberos authentication was required.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "samba: SMB1 client connections can be downgraded to plaintext authentication",
          "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"
        }
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            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
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            "7Server-RH-Gluster-3.5-Samba:samba-debuginfo-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-krb5-printing-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-pidl-0:4.11.6-114.el7rhgs.noarch",
            "7Server-RH-Gluster-3.5-Samba:samba-vfs-glusterfs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-clients-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-krb5-locator-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-modules-0:4.11.6-114.el7rhgs.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "samba: SMB1 client connections can be downgraded to plaintext authentication"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "the Samba project"
          ]
        },
        {
          "names": [
            "Andrew Bartlett"
          ],
          "organization": "Catalyst and the Samba Team"
        }
      ],
      "cve": "CVE-2020-25717",
      "cwe": {
        "id": "CWE-20",
        "name": "Improper Input Validation"
      },
      "discovery_date": "2021-11-03T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2019672"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "samba: Active Directory (AD) domain user could become root on domain members",
          "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": [
          "7Server-RH-Gluster-3.5-Samba:ctdb-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:libsmbclient-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:libsmbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:libwbclient-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:libwbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:python3-samba-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.src",
          "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-client-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-client-libs-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-common-0:4.11.6-114.el7rhgs.noarch",
          "7Server-RH-Gluster-3.5-Samba:samba-common-libs-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-common-tools-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-debuginfo-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-devel-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-krb5-printing-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-libs-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-pidl-0:4.11.6-114.el7rhgs.noarch",
          "7Server-RH-Gluster-3.5-Samba:samba-vfs-glusterfs-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-winbind-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-winbind-clients-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-winbind-krb5-locator-0:4.11.6-114.el7rhgs.x86_64",
          "7Server-RH-Gluster-3.5-Samba:samba-winbind-modules-0:4.11.6-114.el7rhgs.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-25717"
        },
        {
          "category": "external",
          "summary": "RHBZ#2019672",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2019672"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-25717",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-25717"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-25717",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25717"
        },
        {
          "category": "external",
          "summary": "https://www.samba.org/samba/security/CVE-2020-25717.html",
          "url": "https://www.samba.org/samba/security/CVE-2020-25717.html"
        }
      ],
      "release_date": "2021-11-09T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-11-29T12:38:35+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\nAfter installing this update, the smb service will be restarted automatically.\n\nFor details on migrating Samba/CTDB configuration files, refer to: \n\nhttps://access.redhat.com/solutions/4311261",
          "product_ids": [
            "7Server-RH-Gluster-3.5-Samba:ctdb-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libsmbclient-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libsmbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libwbclient-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libwbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:python3-samba-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.src",
            "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-client-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-client-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-common-0:4.11.6-114.el7rhgs.noarch",
            "7Server-RH-Gluster-3.5-Samba:samba-common-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-common-tools-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-debuginfo-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-krb5-printing-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-pidl-0:4.11.6-114.el7rhgs.noarch",
            "7Server-RH-Gluster-3.5-Samba:samba-vfs-glusterfs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-clients-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-krb5-locator-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-modules-0:4.11.6-114.el7rhgs.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:4844"
        },
        {
          "category": "workaround",
          "details": "Setting \"gensec:require_pac=true\" in the smb.conf makes, due to a cache prime in winbind, the DOMAIN\\user lookup succeed, provided nss_winbind is in use, \u0027winbind use default domain = no\u0027 (the default) and no error paths are hit.  \n\nIt would be prudent to pre-create disabled users in Active Directory matching on all privileged names not held in Active Directory, eg \n~~~\n samba-tool user add root -H ldap://$SERVER -U$USERNAME%$PASSWORD --random-password\n samba-tool user add ubuntu -H ldap://$SERVER -U$USERNAME%$PASSWORD --random-password\n ~~~\n (repeat for eg all system users under 1000 in /etc/passwd or special to any other AD-connected services, eg perhaps \"admin\" for a web-app)",
          "product_ids": [
            "7Server-RH-Gluster-3.5-Samba:ctdb-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libsmbclient-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libsmbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libwbclient-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libwbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:python3-samba-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.src",
            "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-client-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-client-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-common-0:4.11.6-114.el7rhgs.noarch",
            "7Server-RH-Gluster-3.5-Samba:samba-common-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-common-tools-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-debuginfo-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-krb5-printing-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-pidl-0:4.11.6-114.el7rhgs.noarch",
            "7Server-RH-Gluster-3.5-Samba:samba-vfs-glusterfs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-clients-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-krb5-locator-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-modules-0:4.11.6-114.el7rhgs.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "7Server-RH-Gluster-3.5-Samba:ctdb-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libsmbclient-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libsmbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libwbclient-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:libwbclient-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:python3-samba-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.src",
            "7Server-RH-Gluster-3.5-Samba:samba-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-client-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-client-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-common-0:4.11.6-114.el7rhgs.noarch",
            "7Server-RH-Gluster-3.5-Samba:samba-common-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-common-tools-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-debuginfo-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-devel-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-krb5-printing-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-libs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-pidl-0:4.11.6-114.el7rhgs.noarch",
            "7Server-RH-Gluster-3.5-Samba:samba-vfs-glusterfs-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-clients-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-krb5-locator-0:4.11.6-114.el7rhgs.x86_64",
            "7Server-RH-Gluster-3.5-Samba:samba-winbind-modules-0:4.11.6-114.el7rhgs.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "samba: Active Directory (AD) domain user could become root on domain members"
    }
  ]
}


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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.
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