rhsa-2020_0509
Vulnerability from csaf_redhat
Published
2020-02-14 12:25
Modified
2024-11-22 14:26
Summary
Red Hat Security Advisory: sudo security update

Notes

Topic
An update for sudo is now available for Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions. 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
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: Stack based buffer overflow when pwfeedback is enabled (CVE-2019-18634) 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.
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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  "vulnerabilities": [
    {
      "cve": "CVE-2019-18634",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "discovery_date": "2020-01-30T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1796944"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Sudo application when the \u2019pwfeedback\u0027 option is set to true on the sudoers file. An authenticated user can use this vulnerability to trigger a stack-based buffer overflow under certain conditions even without Sudo privileges. The buffer overflow may allow an attacker to expose or corrupt memory information, crash the Sudo application, or possibly inject code to be run as a root user.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "sudo: Stack based buffer overflow when pwfeedback is enabled",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw can only be exploited if the option `pwfeedback` is enabled in sudo configuration. This option is not enabled by default in any version of Red Hat Enterprise Linux.\nThe sudo packages distributed with Red Hat Enterprise Linux versions are compiled using gcc\u0027s stack-protector feature. The \"Stack Smashing Protection\" may help mitigate code execution attacks for this flaw.\nRed Hat Enterprise Linux 5 is not affected as it doesn\u0027t include the commit which introduced the vulnerability.",
          "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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          "BaseOS-8.0.0.Z.E4S:sudo-0:1.8.25p1-4.el8_0.3.src",
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          "BaseOS-8.0.0.Z.E4S:sudo-debugsource-0:1.8.25p1-4.el8_0.3.x86_64"
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2019-18634"
        },
        {
          "category": "external",
          "summary": "RHBZ#1796944",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1796944"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2019-18634",
          "url": "https://www.cve.org/CVERecord?id=CVE-2019-18634"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-18634",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-18634"
        },
        {
          "category": "external",
          "summary": "https://www.sudo.ws/alerts/pwfeedback.html",
          "url": "https://www.sudo.ws/alerts/pwfeedback.html"
        }
      ],
      "release_date": "2020-01-30T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-02-14T12:25:41+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"
          },
          "url": "https://access.redhat.com/errata/RHSA-2020:0509"
        },
        {
          "category": "workaround",
          "details": "Please follow the steps bellow as mitigation:\n\n1. Check the default properties set for sudo by running:\n\n    ~~~\n    $ sudo -l\n    [sudo] password for user:\n    Matching Defaults entries for users on localhost:\n        !visiblepw, pwfeedback, always_set_home, match_group_by_gid, always_query_group_plugin, env_reset, env_keep=\"COLORS DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS\",\n    env_keep+=\"MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE\", env_keep+=\"LC_COLLATE LC_IDENTIFICATION\n        LC_MEASUREMENT LC_MESSAGES\", env_keep+=\"LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE\", env_keep+=\"LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY\", secure_path=/sbin\\:/bin\\:/usr/sbin\\:/usr/bin\n    ~~~\n\n2. If `pwfeedback` is enabled as shown above, edit your `/etc/sudoers` file, changing the line:\n\n    ~~~\n    Defaults pwfeedback\n    ~~~\n    \n    To:\n\n    ~~~\n    Defaults !pwfeedback\n    ~~~\n    \n    This will disable visual feedback on password typing, making sure the attack is not possible anymore.",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "sudo: Stack based buffer overflow when pwfeedback is enabled"
    }
  ]
}


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