rhsa-2021_1723
Vulnerability from csaf_redhat
Published
2021-05-18 13:45
Modified
2024-11-22 16:24
Summary
Red Hat Security Advisory: sudo security and bug fix 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 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 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. Security Fix(es): * sudo: symbolic link attack in SELinux-enabled sudoedit (CVE-2021-23240) * sudo: possible directory existence test due to race condition in sudoedit (CVE-2021-23239) 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 8.4 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.


To clipboard 

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      "discovery_date": "2021-01-11T00:00:00+00:00",
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          "text": "1915052"
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          "category": "description",
          "text": "A flaw was found in sudoedit. A race condition vulnerability and improper symbolic link resolution could be used by a local unprivileged user to test for the existence of directories and files not normally accessible to the user. This flaw cannot be used to read the content or write to arbitrary files on the file system. The highest threat from this vulnerability is to data confidentiality.",
          "title": "Vulnerability description"
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          "text": "sudo: possible directory existence test due to race condition in sudoedit",
          "title": "Vulnerability summary"
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          "text": "This flaw has been rated as having a security impact of Low. The symbolic link protection is enabled by default in Red Hat Enterprise Linux 7 and 8, preventing this issue from being exploited.",
          "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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      "release_date": "2021-01-11T00:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2021-05-18T13:45:03+00:00",
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          "restart_required": {
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          "url": "https://access.redhat.com/errata/RHSA-2021:1723"
        },
        {
          "category": "workaround",
          "details": "Enabling the symbolic link protection (/proc/sys/fs/protected_symlinks set to 1) is sufficient to mitigate this flaw.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 2.5,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
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          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "sudo: possible directory existence test due to race condition in sudoedit"
    },
    {
      "cve": "CVE-2021-23240",
      "cwe": {
        "id": "CWE-59",
        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
      },
      "discovery_date": "2021-01-11T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1915053"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A race condition vulnerability was found in the temporary file handling of sudoedit\u0027s SELinux RBAC support. On systems where SELinux is enabled, this flaw allows a malicious user with sudoedit permissions to set the owner of an arbitrary file to the user ID of the target user, potentially leading to local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "sudo: symbolic link attack in SELinux-enabled sudoedit",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "SELinux enforcing mode is the default and recommended mode of operation in Red Hat Enterprise Linux. Moreover, the symbolic link protection is enabled by default, thus preventing this issue from being exploited. Therefore, this flaw has been rated as having a security impact of Low for Red Hat Enterprise Linux.",
          "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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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-23240"
        },
        {
          "category": "external",
          "summary": "RHBZ#1915053",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1915053"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-23240",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-23240"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-23240",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-23240"
        },
        {
          "category": "external",
          "summary": "https://www.sudo.ws/alerts/sudoedit_selinux.html",
          "url": "https://www.sudo.ws/alerts/sudoedit_selinux.html"
        }
      ],
      "release_date": "2021-01-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-05-18T13:45:03+00:00",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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      ],
      "title": "sudo: symbolic link attack in SELinux-enabled sudoedit"
    }
  ]
}


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