rhsa-2021_3723
Vulnerability from csaf_redhat
Published
2021-10-05 05:19
Modified
2024-11-22 16:42
Summary
Red Hat Security Advisory: samba security, bug fix and enhancement update

Notes

Topic
Updated samba packages that fix several bugs with added enhancement are now available for Red Hat Gluster Storage 3.5 on Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. 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
Red Hat Gluster Storage is a software only scale-out storage solution that provides flexible and affordable unstructured data storage. It unifies data storage and infrastructure, increases performance, and improves availability and manageability to meet enterprise-level storage challenges. Security Fix(es): * samba: Netlogon elevation of privilege vulnerability (Zerologon) (CVE-2020-1472) * samba: Missing handle permissions check in SMB1/2/3 ChangeNotify (CVE-2020-14318) * samba: Unprivileged user can crash winbind (CVE-2020-14323) * samba: Negative idmap cache entries can cause incorrect group entries in the Samba file server process token (CVE-2021-20254) 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. 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": "Updated samba packages that fix several bugs with added enhancement are now available for Red Hat Gluster Storage 3.5 on Red Hat Enterprise Linux 7.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. 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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        "name": "Improper Authentication"
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      "ids": [
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          "text": "1879822"
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        {
          "category": "description",
          "text": "A flaw was found in the Microsoft Windows Netlogon Remote Protocol (MS-NRPC), where it reuses a known, static, zero-value initialization vector (IV) in AES-CFB8 mode. This flaw allows an unauthenticated attacker to impersonate a domain-joined computer, including a domain controller, and possibly obtain domain administrator\r\nprivileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "samba: Netlogon elevation of privilege vulnerability (Zerologon)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "As per upstream samba domain controllers (AD and NT4-like) can be impacted by the ZeroLogon CVE-2020-1472. Samba packages shipped with Red Hat Gluster Storage 3, Red Hat Enterprise Linux 7 and 8 are not vulnerable by default, since they have \"server schannel\" enabled by default in its configuration file.",
          "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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          "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
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          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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            "7Server-RH-Gluster-3.5-Samba:samba-winbind-clients-0:4.11.6-112.el7rhgs.x86_64",
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            "7Server-RH-Gluster-3.5-Samba:samba-winbind-modules-0:4.11.6-112.el7rhgs.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "exploit_status",
          "date": "2021-11-03T00:00:00+00:00",
          "details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        },
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "samba: Netlogon elevation of privilege vulnerability (Zerologon)"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "the Samba project"
          ]
        },
        {
          "names": [
            "Steven French"
          ],
          "organization": "Microsoft and the Samba Team",
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2020-14318",
      "cwe": {
        "id": "CWE-266",
        "name": "Incorrect Privilege Assignment"
      },
      "discovery_date": "2020-10-29T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1892631"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way Samba handled file and directory permissions. This flaw allows an authenticated user to gain access to certain file and directory information, which otherwise would be unavailable. The highest threat from this vulnerability is to confidentiality.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "samba: Missing handle permissions check in SMB1/2/3 ChangeNotify",
          "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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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-14318"
        },
        {
          "category": "external",
          "summary": "RHBZ#1892631",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1892631"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-14318",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-14318"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-14318",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14318"
        },
        {
          "category": "external",
          "summary": "https://www.samba.org/samba/security/CVE-2020-14318.html",
          "url": "https://www.samba.org/samba/security/CVE-2020-14318.html"
        }
      ],
      "release_date": "2020-10-29T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-10-05T05:19:08+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:3723"
        },
        {
          "category": "workaround",
          "details": "As Samba internally opens an underlying file system handle on a directory when a client requests an open, even for FILE_READ_ATTRIBUTES then if the underlying file system permissions don\u0027t allow \"r\" (read) access for the connected user, then the handle open request will be denied.\n\n\"r\" access is the normal permission needed to list or otherwise reveal the contents of a directory, so if a connected user has \"r\" access then they will be able to list the directory contents normally, and the information received by a ChangeNofity request is already available to the user.\n\nThe security issue occurs if the Administrator or directory owner had set more restrictive Windows ACL permissions on the directory to disallow read access to the user, and this permissions change was not reflected in the underlying file system permissions.\n\nThis will only occur if Samba is configured with VFS modules to decouple the underlying file system permissions from the Windows ACLs, by setting up a share with the settings:\n\n[vulnerable_share]\n        vfs_objects = vfs_acl_xattr\n        acl_xattr:ignore system acls = yes",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "samba: Missing handle permissions check in SMB1/2/3 ChangeNotify"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "the Samba project"
          ]
        },
        {
          "names": [
            "Bas Alberts"
          ],
          "organization": "GitHub Security Lab Team",
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2020-14323",
      "cwe": {
        "id": "CWE-170",
        "name": "Improper Null Termination"
      },
      "discovery_date": "2020-10-27T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1891685"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A null pointer dereference flaw was found in Samba\u0027s winbind service. This flaw allows a local user to crash the winbind service, causing a denial of service. The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "samba: Unprivileged user can crash winbind",
          "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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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-14323"
        },
        {
          "category": "external",
          "summary": "RHBZ#1891685",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1891685"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-14323",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-14323"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-14323",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14323"
        },
        {
          "category": "external",
          "summary": "https://www.samba.org/samba/security/CVE-2020-14323.html",
          "url": "https://www.samba.org/samba/security/CVE-2020-14323.html"
        }
      ],
      "release_date": "2020-10-29T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-10-05T05:19:08+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "samba: Unprivileged user can crash winbind"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "the Samba project"
          ]
        },
        {
          "names": [
            "Peter Eriksson"
          ],
          "organization": "IT Department, Link\u00f6ping University",
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2021-20254",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2021-04-14T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1949442"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "samba: Negative idmap cache entries can cause incorrect group entries in the Samba file server process token",
          "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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          "summary": "Canonical URL",
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          "category": "external",
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          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2021-20254"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20254",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20254"
        },
        {
          "category": "external",
          "summary": "https://www.samba.org/samba/security/CVE-2021-20254.html",
          "url": "https://www.samba.org/samba/security/CVE-2021-20254.html"
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        }
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "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",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "samba: Negative idmap cache entries can cause incorrect group entries in the Samba file server process token"
    }
  ]
}


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Sightings

Author Source Type Date

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.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.