CVE-2023-40547 (GCVE-0-2023-40547)

Vulnerability from cvelistv5 – Published: 2024-01-25 15:54 – Updated: 2025-11-20 07:24
VLAI
Title
Shim: rce in http boot support may lead to secure boot bypass
Summary
A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.
Severity
8.3 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2024:1834 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1835 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1873 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1876 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1883 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1902 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1903 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1959 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:2086 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2023-40547 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2234589 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 7 Unaffected: 0:15.8-3.el7 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:7::server
    cpe:/o:redhat:enterprise_linux:7::workstation
    cpe:/o:redhat:enterprise_linux:7::client
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7 Unaffected: 0:15.8-1.el7 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:7::server
    cpe:/o:redhat:enterprise_linux:7::workstation
    cpe:/o:redhat:enterprise_linux:7::client
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:15.8-4.el8_9 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support Unaffected: 0:15.8-2.el8_2 , < * (rpm)
    cpe:/o:redhat:rhel_tus:8.2::baseos
    cpe:/o:redhat:rhel_e4s:8.2::baseos
    cpe:/o:redhat:rhel_aus:8.2::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service Unaffected: 0:15.8-2.el8_2 , < * (rpm)
    cpe:/o:redhat:rhel_tus:8.2::baseos
    cpe:/o:redhat:rhel_e4s:8.2::baseos
    cpe:/o:redhat:rhel_aus:8.2::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions Unaffected: 0:15.8-2.el8_2 , < * (rpm)
    cpe:/o:redhat:rhel_tus:8.2::baseos
    cpe:/o:redhat:rhel_e4s:8.2::baseos
    cpe:/o:redhat:rhel_aus:8.2::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 0:15.8-2.el8_4 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.4::baseos
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_tus:8.4::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service Unaffected: 0:15.8-2.el8_4 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.4::baseos
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_tus:8.4::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions Unaffected: 0:15.8-2.el8_4 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.4::baseos
    cpe:/o:redhat:rhel_aus:8.4::baseos
    cpe:/o:redhat:rhel_tus:8.4::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Unaffected: 0:15.8-2.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_eus:8.6::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support Unaffected: 0:15.8-2.el8 , < * (rpm)
    cpe:/o:redhat:rhel_eus:8.8::baseos
    cpe:/a:redhat:rhel_eus:8.8::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support Unaffected: 0:15.8-2.el8 , < * (rpm)
    cpe:/o:redhat:rhel_eus:8.8::baseos
    cpe:/a:redhat:rhel_eus:8.8::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:15.8-4.el9_3 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support Unaffected: 0:15.8-3.el9 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.0::appstream
    cpe:/o:redhat:rhel_eus:9.0::baseos
    cpe:/a:redhat:rhel_eus:9.0::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support Unaffected: 0:15.8-2.el9 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.0::appstream
    cpe:/o:redhat:rhel_eus:9.0::baseos
    cpe:/a:redhat:rhel_eus:9.0::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support Unaffected: 0:15.8-2.el9 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.0::appstream
    cpe:/o:redhat:rhel_eus:9.0::baseos
    cpe:/a:redhat:rhel_eus:9.0::crb
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support Unaffected: 0:15.8-3.el9_2 , < * (rpm)
    cpe:/o:redhat:rhel_eus:9.2::baseos
 Create a notification for this product.
Date Public
2024-01-23 00:00
Credits
Red Hat would like to thank Bill Demirkapi (Microsoft Security Response Center) for reporting this issue.
Show details on NVD website
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\"affected\"}, {\"cpes\": [\"cpe:/a:redhat:rhel_eus:9.0::appstream\", \"cpe:/o:redhat:rhel_eus:9.0::baseos\", \"cpe:/a:redhat:rhel_eus:9.0::crb\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9.0 Extended Update Support\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0:15.8-2.el9\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"shim-unsigned-x64\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/o:redhat:rhel_eus:9.2::baseos\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9.2 Extended Update Support\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0:15.8-3.el9_2\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"shim\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2023-05-05T00:00:00.000Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2024-01-23T00:00:00.000Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2024-01-23T00:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2024:1834\", \"name\": \"RHSA-2024:1834\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:1835\", \"name\": \"RHSA-2024:1835\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:1873\", \"name\": \"RHSA-2024:1873\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:1876\", \"name\": \"RHSA-2024:1876\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:1883\", \"name\": \"RHSA-2024:1883\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:1902\", \"name\": \"RHSA-2024:1902\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:1903\", \"name\": \"RHSA-2024:1903\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:1959\", \"name\": \"RHSA-2024:1959\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2024:2086\", \"name\": \"RHSA-2024:2086\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2023-40547\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2234589\", \"name\": \"RHBZ#2234589\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"If a system isn\\u2019t required to boot from the network, configure the server\\u2019s boot order to disable entirely or skip the network boot.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A remote code execution vulnerability was found in Shim. The Shim boot support trusts attacker-controlled values when parsing an HTTP response. This flaw allows an attacker to craft a specific malicious HTTP request, leading to a completely controlled out-of-bounds write primitive and complete system compromise. This flaw is only exploitable during the early boot phase, an attacker needs to perform a Man-in-the-Middle or compromise the boot server to be able to exploit this vulnerability successfully.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2025-11-20T07:24:31.172Z\"}, \"x_redhatCweChain\": \"CWE-346-\u003eCWE-787: Origin Validation Error leads to Out-of-bounds Write\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-40547\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-20T07:24:31.172Z\", \"dateReserved\": \"2023-08-15T20:04:15.615Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2024-01-25T15:54:23.102Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.