rhsa-2022_0268
Vulnerability from csaf_redhat
Published
2022-01-25 18:04
Modified
2024-11-15 10:45
Summary
Red Hat Security Advisory: polkit security update

Notes

Topic
An update for polkit is now available for Red Hat Enterprise Linux 8.1 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 polkit packages provide a component for controlling system-wide privileges. This component provides a uniform and organized way for non-privileged processes to communicate with privileged ones. Security Fix(es): * polkit: Local privilege escalation in pkexec due to incorrect handling of argument vector (CVE-2021-4034) 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.


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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Qualys Research Labs"
          ]
        }
      ],
      "cve": "CVE-2021-4034",
      "cwe": {
        "id": "CWE-20",
        "name": "Improper Input Validation"
      },
      "discovery_date": "2021-11-18T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2025869"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A local privilege escalation vulnerability was found on polkit\u0027s pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn\u0027t handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it\u0027ll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "polkit: Local privilege escalation in pkexec due to incorrect handling of argument vector",
          "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-2021-4034"
        },
        {
          "category": "external",
          "summary": "RHBZ#2025869",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2025869"
        },
        {
          "category": "external",
          "summary": "RHSB-2022-001",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2022-001"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-4034",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-4034"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-4034",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4034"
        },
        {
          "category": "external",
          "summary": "https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt",
          "url": "https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt"
        },
        {
          "category": "external",
          "summary": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
          "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
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      "release_date": "2022-01-25T17:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2022-01-25T18:04:56+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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          "url": "https://access.redhat.com/errata/RHSA-2022:0268"
        },
        {
          "category": "workaround",
          "details": "For customers who cannot update immediately and doesn\u0027t have Secure Boot feature enabled, the issue can be mitigated by executing the following steps:\n\n1)    Install required systemtap packages and dependencies as per - pointed by https://access.redhat.com/solutions/5441\n\n2)    Install polkit debug info:\n    ~~~\n    debuginfo-install polkit\n    ~~~\n\n3)    Create the following systemtap script, and name it pkexec-block.stp:\n    ~~~\n    probe process(\"/usr/bin/pkexec\").function(\"main\")  {\n        if (cmdline_arg(1) == \"\")\n                        raise(9);\n}\n~~~\n\n4) Load the systemtap module into the running kernel:\n    ~~~\n    stap -g -F -m stap_pkexec_block pkexec_block.stp\n    ~~~\n\n5) Ensure the module is loaded:\n    ~~~\n     lsmod | grep -i stap_pkexec_block\nstap_pkexec_block     434176  0\n~~~\n\n6) Once polkit package was updated to the version containing the fix, the systemtap generated kernel module can be removed by running:\n    ~~~\n    rmmod stap_pkexec_block\n    ~~~\n\nThis mitigation doesn\u0027t work for Secure Boot enabled system as SystemTap would require an external compiling server to be able to sign the generated kernel module\nwith a key enrolled into the Kernel\u0027s keyring.",
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            "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"
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      "threats": [
        {
          "category": "exploit_status",
          "date": "2022-06-27T00:00:00+00:00",
          "details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        },
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "polkit: Local privilege escalation in pkexec due to incorrect handling of argument vector"
    }
  ]
}


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