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

Vulnerability from cvelistv5 – Published: 2024-01-25 15:54 – Updated: 2026-06-26 09:43
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
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::client
    cpe:/o:redhat:enterprise_linux:7::server
    cpe:/o:redhat:enterprise_linux:7::workstation
 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::client
    cpe:/o:redhat:enterprise_linux:7::server
    cpe:/o:redhat:enterprise_linux:7::workstation
 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_aus:8.2::baseos
    cpe:/o:redhat:rhel_e4s:8.2::baseos
    cpe:/o:redhat:rhel_tus: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_aus:8.2::baseos
    cpe:/o:redhat:rhel_e4s:8.2::baseos
    cpe:/o:redhat:rhel_tus: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_aus:8.2::baseos
    cpe:/o:redhat:rhel_e4s:8.2::baseos
    cpe:/o:redhat:rhel_tus: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_e4s: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_aus:8.4::baseos
    cpe:/o:redhat:rhel_e4s: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_aus:8.4::baseos
    cpe:/o:redhat:rhel_e4s: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:/a:redhat:rhel_eus:8.8::crb
    cpe:/o:redhat:rhel_eus:8.8::baseos
 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
Credits
Red Hat would like to thank Bill Demirkapi (Microsoft Security Response Center) for reporting this issue.
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  }
}



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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.

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  • 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.