rhsa-2018:3249
Vulnerability from csaf_redhat
Published
2018-10-30 13:28
Modified
2025-10-09 18:41
Summary
Red Hat Security Advisory: setup security and bug fix update

Notes

Topic
An update for setup is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Low. 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
The setup package contains a set of important default system configuration and setup files. Examples include /etc/passwd, /etc/group, and /etc/profile. Other examples are the default lists of reserved user IDs, reserved ports, reserved protocols, allowed shells, allowed secure terminals. Security Fix(es): * setup: nologin listed in /etc/shells violates security expectations (CVE-2018-1113) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from 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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        "text": "An update for setup is now available for Red Hat Enterprise Linux 7.\n\nRed Hat Product Security has rated this update as having a security impact of Low. 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": "The setup package contains a set of important default system configuration and setup files. Examples include /etc/passwd, /etc/group, and /etc/profile. Other examples are the default lists of reserved user IDs, reserved ports, reserved protocols, allowed shells, allowed secure terminals.\n\nSecurity Fix(es):\n\n* setup: nologin listed in /etc/shells violates security expectations (CVE-2018-1113)\n\nFor more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.",
        "title": "Details"
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    "title": "Red Hat Security Advisory: setup security and bug fix update",
    "tracking": {
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  "vulnerabilities": [
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      "cwe": {
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        "name": "Improper Authorization"
      },
      "discovery_date": "2018-04-24T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1571094"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Setup in Fedora and Red Hat Enterprise Linux added /sbin/nologin and /usr/sbin/nologin to /etc/shells. This violates security assumptions made by pam_shells and some daemons which allow access based on a user\u0027s shell being listed in /etc/shells.  Under some circumstances, users which had their shell changed to /sbin/nologin could still access the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "setup: nologin listed in /etc/shells violates security expectations",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Preventing a user from accessing the system without deleting their account is not a simple matter. For utmost security, the account should be deleted. Short of this, we recommend a three-pronged approach:\n * change the user\u0027s login shell to a harmless command that is not in \"/etc/shells\" (for example \"/bin/false\") to prevent commands being run on their behalf\n * lock the user\u0027s password with \"usermod -L\" to prevent authentication with pam services\n * prevent access to the user\u0027s home directory with \"chmod 0\" or \"chown root\" and \"chmod 700\" to prevent authentication with ssh keys etc",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-1113"
        },
        {
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          "summary": "RHBZ#1571094",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1571094"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-1113",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-1113"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-1113",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-1113"
        }
      ],
      "release_date": "2018-04-24T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2018-10-30T13:28:41+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",
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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2018:3249"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "LOW",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L",
            "version": "3.0"
          },
          "products": [
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            "7Client-7.6:setup-0:2.8.71-10.el7.src",
            "7ComputeNode-7.6:setup-0:2.8.71-10.el7.noarch",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "setup: nologin listed in /etc/shells violates security expectations"
    }
  ]
}


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