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 version of shim / shim-unsigned-x64 installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2023-40549 advisory.

  - 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 this issue but has instead relied only on the application's self-reported version number.

An update of the shim package has been released.

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

    Issue summary: Processing a maliciously formatted PKCS12 file may lead OpenSSL to crash leading to a     potential Denial of Service attack Impact summary: Applications loading files in the PKCS12 format from     untrusted sources might terminate abruptly. A file in PKCS12 format can contain certificates and keys and     may come from an untrusted source. The PKCS12 specification allows certain fields to be NULL, but OpenSSL     does not correctly check for this case. This can lead to a NULL pointer dereference that results in     OpenSSL crashing. If an application processes PKCS12 files from an untrusted source using the OpenSSL APIs     then that application will be vulnerable to this issue. OpenSSL APIs that are vulnerable to this are:
    PKCS12_parse(), PKCS12_unpack_p7data(), PKCS12_unpack_p7encdata(), PKCS12_unpack_authsafes() and     PKCS12_newpass(). We have also fixed a similar issue in SMIME_write_PKCS7(). However since this function     is related to writing data we do not consider it security significant. The FIPS modules in 3.2, 3.1 and     3.0 are not affected by this issue.(CVE-2024-0727)

    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 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)

    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)

Tenable has extracted the preceding description block directly from the EulerOS shim security advisory.

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 :

    Issue summary: Processing a maliciously formatted PKCS12 file may lead OpenSSL to crash leading to a     potential Denial of Service attack Impact summary: Applications loading files in the PKCS12 format from     untrusted sources might terminate abruptly. A file in PKCS12 format can contain certificates and keys and     may come from an untrusted source. The PKCS12 specification allows certain fields to be NULL, but OpenSSL     does not correctly check for this case. This can lead to a NULL pointer dereference that results in     OpenSSL crashing. If an application processes PKCS12 files from an untrusted source using the OpenSSL APIs     then that application will be vulnerable to this issue. OpenSSL APIs that are vulnerable to this are:
    PKCS12_parse(), PKCS12_unpack_p7data(), PKCS12_unpack_p7encdata(), PKCS12_unpack_authsafes() and     PKCS12_newpass(). We have also fixed a similar issue in SMIME_write_PKCS7(). However since this function     is related to writing data we do not consider it security significant. The FIPS modules in 3.2, 3.1 and     3.0 are not affected by this issue.(CVE-2024-0727)

    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 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)

    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)

Tenable has extracted the preceding description block directly from the EulerOS shim security advisory.

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 Virtualization 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 Virtualization 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.

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.

    - Full list of fixed CVEs: CVE-2023-40546, CVE-2023-40547,       CVE-2023-40548, CVE-2023-40549, CVE-2023-40550, CVE-2023-40551 [Orabug: 36271343]
    - Update to shim-15.8 for CVE-2023-40547       Resolves: RHEL-11254

    shim-signed
    - Full list of fixed CVEs: CVE-2023-40546, CVE-2023-40547,       CVE-2023-40548, CVE-2023-40549, CVE-2023-40550, CVE-2023-40551 [Orabug: 36271343]

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining     to a trusted full boot loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    [15.8-4.0.1]
    - Add support for Oracle signed shim [Orabug: 36540084]
    - Add shim binaries signed with Oracle Secure Boot Signing (key 1) [Orabug: 36540084]

    [15.8-1.0.3]
    - Update shimx64.efi, shimia32.efi and shimaa64.efi v15.8 signed by Microsoft [Orabug: 36072863]

    [15.8-1.0.2]
    - Use binaries with correct shim.ol generation [Orabug: 36072863]
    - Set SBAT_AUTOMATIC_DATE=2021030218 [Orabug: 36072863]

    [15.8-1.0.1]
    - Update to 15.8 [Orabug: 36072863]
    - fix CVE-2023-40546, CVE-2023-40547, CVE-2023-40548, CVE-2023-40549, CVE-2023-40550, CVE-2023-40551     [Orabug: 36072863]

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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.

    [15.8-1.0.3]
    - Update shimx64.efi and shimaa64.efi v15.8 signed by Microsoft [Orabug: 36072879]
    - Update shim fb and mm binaries to match unsigned releases [Orabug: 36072879]

    [15.8-1.0.2]
    - Use binaries with correct shim.ol generation [Orabug: 36072879]
    - Set SBAT_AUTOMATIC_DATE=2021030218 [Orabug: 36072879]

    [15.8-1.0.1]
    - Update to 15.8 [Orabug: 36072879]
    - fix CVE-2023-40546, CVE-2023-40547, CVE-2023-40548, CVE-2023-40549, CVE-2023-40550, CVE-2023-40551     [Orabug: 36072879]

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining     to a trusted full boot loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

    IMPORTANT: The new shim revokes ALL VERSIONS of GRUB2 before grub2-2.02-0.87.el7_9.14. Therefore GRUB2     MUST be updated to the latest     version: grub2-2.02-0.87.el7_9.14 BEFORE or SIMULTANEOUSLY with this shim in order for Secure Boot to     continue to work. Failure to update GRUB2 will result in an UNBOOTABLE system.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining     to a trusted full boot loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining     to a trusted full boot loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining     to a trusted full boot loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining     to a trusted full boot loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot     loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    The shim package contains a first stage UEFI boot loader that handles chaining to a trusted full boot     loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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.

    The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot     loader under secure boot environments.

    Security Fix(es):

    * 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 printing error messages (CVE-2023-40546)

    * 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)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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
207033	CBL Mariner 2.0 Security Update: shim / shim-unsigned-x64 (CVE-2023-40549)	Nessus	MarinerOS Local Security Checks	medium
206824	Nutanix AHV : Multiple Vulnerabilities (NXSA-AHV-20230302.101026)	Nessus	Misc.	high
205176	Photon OS 5.0: Shim PHSA-2024-5.0-0332	Nessus	PhotonOS Local Security Checks	high
198193	EulerOS 2.0 SP12 : shim (EulerOS-SA-2024-1753)	Nessus	Huawei Local Security Checks	high
198178	EulerOS 2.0 SP12 : shim (EulerOS-SA-2024-1776)	Nessus	Huawei Local Security Checks	high
197139	EulerOS Virtualization 2.11.0 : shim (EulerOS-SA-2024-1638)	Nessus	Huawei Local Security Checks	high
197117	EulerOS Virtualization 2.11.1 : shim (EulerOS-SA-2024-1619)	Nessus	Huawei Local Security Checks	high
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

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