CVE-2023-40550 (GCVE-0-2023-40550)

Vulnerability from cvelistv5 – Published: 2024-01-29 16:29 – Updated: 2026-01-27 10:55
VLAI
Title
Shim: out-of-bound read in verify_buffer_sbat()
Summary
An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
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-2023-40550 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2259915 issue-trackingx_refsource_REDHAT
https://lists.debian.org/debian-lts-announce/2024… x_transferred
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_aus:8.4::baseos
    cpe:/o:redhat:rhel_tus:8.4::baseos
    cpe:/o:redhat:rhel_e4s: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_aus:8.4::baseos
    cpe:/o:redhat:rhel_tus:8.4::baseos
    cpe:/o:redhat:rhel_e4s: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_aus:8.4::baseos
    cpe:/o:redhat:rhel_tus:8.4::baseos
    cpe:/o:redhat:rhel_e4s: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 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:/a:redhat:rhel_eus:9.0::crb
    cpe:/o:redhat:rhel_eus:9.0::baseos
 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:/a:redhat:rhel_eus:9.0::crb
    cpe:/o:redhat:rhel_eus:9.0::baseos
 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
Show details on NVD website
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This issue may expose sensitive data during the system\u0027s boot phase.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-01-27T10:55:03.902Z\"}, \"x_redhatCweChain\": \"CWE-125: Out-of-bounds Read\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-40550\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-27T10:55:03.902Z\", \"dateReserved\": \"2023-08-15T20:04:15.615Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2024-01-29T16:29:23.050Z\", \"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.