The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:4140-1 advisory.

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

  - When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed     glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input     which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability     issues. Although complex, arbitrary code execution could not be discarded. (CVE-2022-3775)

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 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:4143-1 advisory.

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

  - When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed     glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input     which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability     issues. Although complex, arbitrary code execution could not be discarded. (CVE-2022-3775)

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 packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:4302-1 advisory.

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

  - When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed     glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input     which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability     issues. Although complex, arbitrary code execution could not be discarded. (CVE-2022-3775)

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-2023:0048 advisory.

    The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and     customizable boot loader with modular architecture. The packages support a variety of kernel formats, file     systems, computer architectures, and hardware devices.

    Security Fix(es):

    * grub2: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure     boot bypass (CVE-2022-2601)

    * grub2: Heap based out-of-bounds write when redering certain unicode sequences (CVE-2022-3775)

    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.

    Bug Fix(es):

    * [RHEL8.6][SecureBoot][Denali/P10] boot process stops at grub prompt after copying the signed grub to     prep partition (BZ#2108049)

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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2023-12019 advisory.

    - Fix CVE-2022-2601 and CVE-2022-3775 [Orabug: 34871953]

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 AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2023:0752 advisory.

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

  - When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed     glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input     which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability     issues. Although complex, arbitrary code execution could not be discarded. (CVE-2022-3775)

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 grub2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

  - When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed     glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input     which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability     issues. Although complex, arbitrary code execution could not be discarded. (CVE-2022-3775)

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 version of grub2 installed on the remote host is prior to 2.06-14. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-2146 advisory.

    A flaw was found in grub 2, where a crafted 16-bit grayscale PNG image may lead to an out-of-bounds write.
    This flaw allows an attacker to corrupt the data on the heap portion of the grub2's memory, leading to     possible code execution and the circumvention of the secure boot mechanism. (CVE-2021-3695)

    A flaw was found in grub2 when handling a PNG image header. When decoding the data contained in the     Huffman table at the PNG file header, an out-of-bounds write may happen on grub's heap. (CVE-2021-3696)

    A flaw was found in grub2 when handling JPEG images. This flaw allows an attacker to craft a malicious     JPEG image, which leads to an underflow on a grub2's internal pointer, leading to a heap-based out-of-     bounds write. Secure-boot mechanisms circumvention and arbitrary code execution may also be achievable.
    (CVE-2021-3697)

    A flaw was found where a maliciously crafted pf2 font could lead to an out-of-bounds write in grub2. A     successful attack can lead to memory corruption and secure boot circumvention. (CVE-2022-2601)

    A flaw was found in grub2 when handling IPv4 packets. This flaw allows an attacker to craft a malicious     packet, triggering an integer underflow in grub code. Consequently, the memory allocation for handling the     packet data may be smaller than the size needed. This issue causes an out-of-bands write during packet     handling, compromising data integrity, confidentiality issues, a denial of service, and remote code     execution. (CVE-2022-28733)

    A flaw was found in grub2 when handling split HTTP headers. While processing a split HTTP header, grub2     wrongly advances its control pointer to the internal buffer by one position, which can lead to an out-of-     bounds write. This flaw allows an attacker to leverage this issue by crafting a malicious set of HTTP     packages making grub2 corrupt its internal memory metadata structure. This leads to data integrity and     confidentiality issues or forces grub to crash, resulting in a denial of service attack. (CVE-2022-28734)

    A flaw was found in grub2. The shim_lock verifier from grub2 allows non-kernel files to be loaded when     secure boot is enabled, giving the possibility of unverified code or modules to be loaded when it should     not be allowed. (CVE-2022-28735)

    A use-after-free vulnerability was found on grub2's chainloader command. This flaw allows an attacker to     gain access to restricted data or cause arbitrary code execution if they can establish control from grub's     memory allocation pattern. (CVE-2022-28736)

    A flaw was found in the grub2 font code. When rendering certain unicode sequences, it fails to properly     validate the font width and height. These values are further used to access the font buffer, causing     possible out-of-bounds writes. A malicious actor may craft a font capable of triggering this issue,     allowing modifications in unauthorized memory segments, causing data integrity problems or leading to     denial of service. (CVE-2022-3775)

Tenable has extracted the preceding description block directly from the tested product 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 Windows host is missing security update 5041773. It is, therefore, affected by multiple vulnerabilities

  - An elevation of privilege vulnerability exists in Windows based systems supporting Virtualization Based     Security (VBS) including a subset of Azure Virtual Machine SKUS. This can allow an attacker with     administrator privileges to replace current versions of Windows system files with outdated versions. By     exploiting this vulnerability, an attacker could reintroduce previously mitigated vulnerabilities,     circumvent some features of VBS, and exfiltrate data protected by VBS. (CVE-2024-21302)

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

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

The remote Windows host is missing security update 5041585. It is, therefore, affected by multiple vulnerabilities

  - An elevation of privilege vulnerability exists in Windows based systems supporting Virtualization Based     Security (VBS) including a subset of Azure Virtual Machine SKUS. This can allow an attacker with     administrator privileges to replace current versions of Windows system files with outdated versions. By     exploiting this vulnerability, an attacker could reintroduce previously mitigated vulnerabilities,     circumvent some features of VBS, and exfiltrate data protected by VBS. (CVE-2024-21302)

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

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

The remote Windows host is missing security update 5041592. It is, therefore, affected by multiple vulnerabilities

  - An elevation of privilege vulnerability exists in Windows based systems supporting Virtualization Based     Security (VBS) including a subset of Azure Virtual Machine SKUS. This can allow an attacker with     administrator privileges to replace current versions of Windows system files with outdated versions. By     exploiting this vulnerability, an attacker could reintroduce previously mitigated vulnerabilities,     circumvent some features of VBS, and exfiltrate data protected by VBS. (CVE-2024-21302)

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

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

The remote Windows host is missing security update 5041828. It is, therefore, affected by multiple vulnerabilities

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

  - 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)

  - When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed     glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input     which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability     issues. Although complex, arbitrary code execution could not be discarded. (CVE-2022-3775)

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

The remote Windows host is missing security update 5041578. It is, therefore, affected by multiple vulnerabilities

  - An elevation of privilege vulnerability exists in Windows based systems supporting Virtualization Based     Security (VBS) including a subset of Azure Virtual Machine SKUS. This can allow an attacker with     administrator privileges to replace current versions of Windows system files with outdated versions. By     exploiting this vulnerability, an attacker could reintroduce previously mitigated vulnerabilities,     circumvent some features of VBS, and exfiltrate data protected by VBS. (CVE-2024-21302)

  - A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an     overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph,     this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this     vulnerability to circumvent the secure boot mechanism. (CVE-2022-2601)

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

ID	Name	Product	Family	Published	Updated	Severity
168055	SUSE SLES15 Security Update : grub2 (SUSE-SU-2022:4140-1)	Nessus	SuSE Local Security Checks	11/22/2022	7/14/2023	high
168072	SUSE SLES12 Security Update : grub2 (SUSE-SU-2022:4143-1)	Nessus	SuSE Local Security Checks	11/22/2022	7/14/2023	high
168340	SUSE SLES12 Security Update : grub2 (SUSE-SU-2022:4302-1)	Nessus	SuSE Local Security Checks	12/2/2022	7/14/2023	high
169709	RHEL 8 : grub2 (RHSA-2023:0048)	Nessus	Red Hat Local Security Checks	1/9/2023	11/7/2024	high
169998	Oracle Linux 9 : grub2 (ELSA-2023-12019)	Nessus	Oracle Linux Local Security Checks	1/12/2023	11/1/2024	high
171462	AlmaLinux 9 : grub2 (ALSA-2023:0752)	Nessus	Alma Linux Local Security Checks	2/14/2023	9/4/2023	high
172201	EulerOS 2.0 SP11 : grub2 (EulerOS-SA-2023-1407)	Nessus	Huawei Local Security Checks	3/7/2023	8/31/2023	high
178506	Amazon Linux 2 : grub2 (ALAS-2023-2146)	Nessus	Amazon Linux Local Security Checks	7/20/2023	12/11/2024	high
205447	KB5041773: Windows 10 Version 1607 / Windows Server 2016 Security Update (August 2024)	Nessus	Windows : Microsoft Bulletins	8/13/2024	11/6/2024	critical
205448	KB5041585: Windows 11 version 22H2 / Windows 11 version 23H2 Security Update (August 2024)	Nessus	Windows : Microsoft Bulletins	8/13/2024	11/6/2024	critical
205450	KB5041592: Windows 11 version 21H2 Security Update (August 2024)	Nessus	Windows : Microsoft Bulletins	8/13/2024	11/6/2024	critical
205453	KB5041828: Windows Server 2012 R2 Security Update (August 2024)	Nessus	Windows : Microsoft Bulletins	8/13/2024	11/6/2024	critical
205461	KB5041578: Windows 10 version 1809 / Windows Server 2019 Security Update (August 2024)	Nessus	Windows : Microsoft Bulletins	8/13/2024	11/6/2024	critical

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