An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and crashing Shim, resulting in a denial of service.

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3813 advisory.

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2024-1959 advisory.

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - 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. (CVE-2023-40550)

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:1461-1 advisory.

  - There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables;
    The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An     attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not     discarded in such scenario. (CVE-2022-28737)

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:1462-1 advisory.

  - There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables;
    The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An     attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not     discarded in such scenario. (CVE-2022-28737)

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:2086 advisory.

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1959 advisory.

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2024-1902 advisory.

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - 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.
    (CVE-2023-40547)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2024-1903 advisory.

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - 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. (CVE-2023-40550)

  - 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.
    (CVE-2023-40547)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1959 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:1368-1 advisory.

  - There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables;
    The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An     attacker can leverage this to perform out-of-bound writes into memory. Arbitrary code execution is not     discarded in such scenario. (CVE-2022-28737)

  - A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create     the new variable, it tries to print an error message to the user; however, the number of parameters used     by the logging function doesn't match the format string used by it, leading to a crash under certain     circumstances. (CVE-2023-40546)

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1903 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1902 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1873 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1883 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1876 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1835 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1834 advisory.

  - shim: Out-of-bounds read printing error messages (CVE-2023-40546)

  - shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)

  - shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems     (CVE-2023-40548)

  - shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file (CVE-2023-40549)

  - shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)

  - shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the shim package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the shim packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - 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.
    (CVE-2023-40547)

  - A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition     operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is     further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes     memory corruption and can lead to a crash or data integrity issues during the boot phase. (CVE-2023-40548)

  - An out-of-bounds read flaw was found in Shim due to the lack of proper boundary verification during the     load of a PE binary. This flaw allows an attacker to load a crafted PE binary, triggering the issue and     crashing Shim, resulting in a denial of service. (CVE-2023-40549)

  - 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. (CVE-2023-40550)

  - A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or     possible exposure of sensitive data during the system's boot phase. (CVE-2023-40551)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
196989	Debian dla-3813 : shim-helpers-amd64-signed-template - security update	Nessus	Debian Local Security Checks	high
194956	Oracle Linux 7 : shim (ELSA-2024-1959)	Nessus	Oracle Linux Local Security Checks	high
194744	SUSE SLES15 Security Update : shim (SUSE-SU-2024:1461-1)	Nessus	SuSE Local Security Checks	high
194740	SUSE SLES12 Security Update : shim (SUSE-SU-2024:1462-1)	Nessus	SuSE Local Security Checks	high
194471	RHEL 8 : shim (RHSA-2024:2086)	Nessus	Red Hat Local Security Checks	high
193955	CentOS 7 : shim (RHSA-2024:1959)	Nessus	CentOS Local Security Checks	high
193898	Oracle Linux 8 : shim (ELSA-2024-1902)	Nessus	Oracle Linux Local Security Checks	high
193780	Oracle Linux 9 : shim (ELSA-2024-1903)	Nessus	Oracle Linux Local Security Checks	high
193728	RHEL 7 : shim (RHSA-2024:1959)	Nessus	Red Hat Local Security Checks	high
193725	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : shim (SUSE-SU-2024:1368-1)	Nessus	SuSE Local Security Checks	high
193660	RHEL 9 : shim update (Important) (RHSA-2024:1903)	Nessus	Red Hat Local Security Checks	high
193659	RHEL 8 : shim (RHSA-2024:1902)	Nessus	Red Hat Local Security Checks	high
193477	RHEL 8 : shim (RHSA-2024:1873)	Nessus	Red Hat Local Security Checks	high
193468	RHEL 8 : shim (RHSA-2024:1883)	Nessus	Red Hat Local Security Checks	high
193466	RHEL 9 : shim update (Important) (RHSA-2024:1876)	Nessus	Red Hat Local Security Checks	high
193418	RHEL 9 : shim (RHSA-2024:1835)	Nessus	Red Hat Local Security Checks	high
193413	RHEL 8 : shim (RHSA-2024:1834)	Nessus	Red Hat Local Security Checks	high
191819	EulerOS 2.0 SP11 : shim (EulerOS-SA-2024-1249)	Nessus	Huawei Local Security Checks	high
191797	EulerOS 2.0 SP11 : shim (EulerOS-SA-2024-1227)	Nessus	Huawei Local Security Checks	high

Detections

Analytics

CVE-2023-40549

medium

Tenable Plugins

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high

high