rhsa-2020_1804
Vulnerability from csaf_redhat
Published
2020-04-28 15:48
Modified
2024-11-22 13:59
Summary
Red Hat Security Advisory: sudo security, bug fix, and enhancement update

Notes

Topic
An update for sudo is now available for Red Hat Enterprise Linux 8. 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
The sudo packages contain the sudo utility which allows system administrators to provide certain users with the permission to execute privileged commands, which are used for system management purposes, without having to log in as root. The following packages have been upgraded to a later upstream version: sudo (1.8.29). (BZ#1733961) Security Fix(es): * sudo: attacker with access to a Runas ALL sudoer account can impersonate a nonexistent user (CVE-2019-19232) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.2 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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  "vulnerabilities": [
    {
      "cve": "CVE-2019-19232",
      "cwe": {
        "id": "CWE-284",
        "name": "Improper Access Control"
      },
      "discovery_date": "2019-12-20T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1786704"
        }
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      "notes": [
        {
          "category": "description",
          "text": "It was found that sudo always allowed commands to be run with unknown user or group ids if the sudo configuration allowed it for example via the \"ALL\" alias. This could allow sudo to impersonate non-existent account and depending on how applications are configured, could lead to certain restriction bypass. This is now explicitly disabled. A new setting called \"allow_unknown_runas_id\" was introduced in order to enable this.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "sudo: attacker with access to a Runas ALL sudoer account can impersonate a nonexistent user",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A new setting variable called \"allow_unknown_runas_id\" was introduced which would explicitly allow sudo to run applications with unknown user or group ids (Provided sudo was configured that way, for example via the runas parameter 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"
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          "url": "https://www.cve.org/CVERecord?id=CVE-2019-19232"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-19232",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-19232"
        },
        {
          "category": "external",
          "summary": "https://www.sudo.ws/stable.html#1.8.30",
          "url": "https://www.sudo.ws/stable.html#1.8.30"
        }
      ],
      "release_date": "2019-12-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-04-28T15:48:08+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"
          },
          "url": "https://access.redhat.com/errata/RHSA-2020:1804"
        },
        {
          "category": "workaround",
          "details": "This flaw only affects specific, non-default configurations of sudo, in which sudoers configuration entry allows a user to run a command as any user except root. Any other configuration of sudo is not affected by this flaw.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "sudo: attacker with access to a Runas ALL sudoer account can impersonate a nonexistent user"
    },
    {
      "cve": "CVE-2019-19234",
      "cwe": {
        "id": "CWE-284",
        "name": "Improper Access Control"
      },
      "discovery_date": "2019-12-23T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1786708"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "When an account is disabled via the shadow file, by replacing the password hash with \"!\", it is not considered disabled by sudo. And depending on the configuration, sudo can be run by using such disabled account.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "sudo: by using ! character in the shadow file instead of a password hash can access to a run as all sudoer account",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The new runas_check_shell sudoers setting can be used to require that the runas user have a shell listed in the /etc/shells file. On many systems, users such as bin, do not have a valid shell and this flag can be used to prevent commands from being run as those users.",
          "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": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-19234"
        },
        {
          "category": "external",
          "summary": "RHBZ#1786708",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1786708"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-19234",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-19234"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-19234",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-19234"
        },
        {
          "category": "external",
          "summary": "https://www.sudo.ws/stable.html#1.8.30",
          "url": "https://www.sudo.ws/stable.html#1.8.30"
        }
      ],
      "release_date": "2019-12-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-04-28T15:48:08+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": {
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          "url": "https://access.redhat.com/errata/RHSA-2020:1804"
        },
        {
          "category": "workaround",
          "details": "This flaw basically allows users which have disabled account in /etc/shadow (password is replaced with \u0027!) to have sudo access. Systems not having such disabled account, or systems disabling sudo access for such accounts using other means (such as not allowing such users to run sudo via access control mechanisms) are not affected by this flaw.",
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "sudo: by using ! character in the shadow file instead of a password hash can access to a run as all sudoer account"
    }
  ]
}


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