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 SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:2074-1 advisory.

  - A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data     to be written in heap. To a successful to be performed the attacker needs to perform some triage over the     heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data     corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions     prior grub-2.12. (CVE-2021-3697)

  - grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

  - grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

  - grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

  - grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

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 crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

  - grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

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

  - A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data     to be written in heap. To a successful to be performed the attacker needs to perform some triage over the     heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data     corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions     prior grub-2.12. (CVE-2021-3697)

  - grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

  - grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

  - grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

  - grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

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

  - A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong     permission set allowing non privileged users to read its content. This represents a low severity     confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
    This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no     version with the fix is currently released. (CVE-2021-3981)

  - Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code     accidentally moves its internal data buffer point by one position. This can lead to a out-of-bound write     further when parsing the HTTP request, writing a NULL byte past the buffer. It's conceivable that an     attacker controlled set of packets can lead to corruption of the GRUB2's internal memory metadata.
    (CVE-2022-28734)

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

  - A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data     to be written in heap. To a successful to be performed the attacker needs to perform some triage over the     heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data     corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions     prior grub-2.12. (CVE-2021-3697)

  - grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

  - grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

  - grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

  - grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

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 NewStart CGSL host, running version MAIN 6.06, has mokutil packages installed that are affected by multiple vulnerabilities:

  - A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may     take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent     secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform     some triage over the heap layout to achieve signifcant results, also the values written into the memory     are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2     versions prior grub-2.12. (CVE-2021-3695)

  - A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may     lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be     considered Low as it's very complex to an attacker control the encoding and positioning of corrupted     Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This     flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)

  - A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data     to be written in heap. To a successful to be performed the attacker needs to perform some triage over the     heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data     corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions     prior grub-2.12. (CVE-2021-3697)

  - Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer     underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the     total_len value may end up wrapping around to a small integer number which will be used in memory     allocation. If the attack succeeds in such way, subsequent operations can write past the end of the     buffer. (CVE-2022-28733)

  - Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code     accidentally moves its internal data buffer point by one position. This can lead to a out-of-bound write     further when parsing the HTTP request, writing a NULL byte past the buffer. It's conceivable that an     attacker controlled set of packets can lead to corruption of the GRUB2's internal memory metadata.
    (CVE-2022-28734)

  - The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems.
    Allowing such files to be loaded may lead to unverified code and modules to be loaded in GRUB2 breaking     the secure boot trust-chain. (CVE-2022-28735)

  - There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used     to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2.
    When executing chainloader more than once a use-after-free vulnerability is triggered. If an attacker can     control the GRUB2's memory allocation pattern sensitive data may be exposed and arbitrary code execution     can be achieved. (CVE-2022-28736)

  - 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)

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

The remote Ubuntu 20.04 LTS / 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6355-1 advisory.

    Daniel Axtens discovered that specially crafted images could cause a heap-based out-of-bonds write. A     local attacker could possibly use this to circumvent secure boot protections. (CVE-2021-3695)

    Daniel Axtens discovered that specially crafted images could cause out-of-bonds read and write. A local     attacker could possibly use this to circumvent secure boot protections. (CVE-2021-3696)

    Daniel Axtens discovered that specially crafted images could cause buffer underwrite which allows     arbitrary data to be written to a heap. A local attacker could possibly use this to circumvent secure boot     protections. (CVE-2021-3697)

    It was discovered that GRUB2 configuration files were created with the wrong permissions. An attacker     could possibly use this to leak encrypted passwords. (CVE-2021-3981)

    Daniel Axtens discovered that specially crafted IP packets could cause an integer underflow and write past     the end of a buffer. An attacker could possibly use this to circumvent secure boot protections.
    (CVE-2022-28733)

    Daniel Axtens discovered that specially crafted HTTP headers can cause an out-of-bounds write of a NULL     byte. An attacker could possibly use this to corrupt GRUB2's internal data. (CVE-2022-28734)

    Julian Andres Klode discovered that GRUB2 shim_lock allowed non- kernel files to be loaded. A local attack     could possibly use this to circumvent secure boot protections. (CVE-2022-28735)

    Chris Coulson discovered that executing chainloaders more than once caused a use-after-free vulnerability.
    A local attack could possibly use this to circumvent secure boot protections. (CVE-2022-28736)

    Chris Coulson discovered that specially crafted executables could cause shim to make out-of-bound writes.
    A local attack could possibly use this to circumvent secure boot protections. (CVE-2022-28737)

    Zhang Boyang discovered that specially crafted unicode sequences could lead to an out-of-bounds write to a     heap. A local attacker could possibly use this to circumvent secure boot protections. (CVE-2022-3775)

Tenable has extracted the preceding description block directly from the Ubuntu 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 Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2022_5099 advisory.

    * grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

    * grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap (CVE-2021-3695)

    * grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling (CVE-2021-3696)

    * grub2: Crafted JPEG image can lead to buffer underflow write in the heap (CVE-2021-3697)

    * grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

    * grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

    * grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

    * shim: Buffer overflow when loading crafted EFI images (CVE-2022-28737)

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

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
178506	Amazon Linux 2 : grub2 (ALAS-2023-2146)	Nessus	Amazon Linux Local Security Checks	7/20/2023	12/11/2024	high
162235	SUSE SLES15 Security Update : grub2 (SUSE-SU-2022:2074-1)	Nessus	SuSE Local Security Checks	6/15/2022	1/18/2024	high
164171	EulerOS 2.0 SP5 : grub2 (EulerOS-SA-2022-2268)	Nessus	Huawei Local Security Checks	8/17/2022	1/18/2024	high
164182	EulerOS 2.0 SP10 : grub2 (EulerOS-SA-2022-2242)	Nessus	Huawei Local Security Checks	8/17/2022	1/18/2024	high
170821	EulerOS Virtualization 3.0.2.2 : grub2 (EulerOS-SA-2023-1257)	Nessus	Huawei Local Security Checks	1/30/2023	1/18/2024	high
169312	EulerOS Virtualization 2.10.1 : grub2 (EulerOS-SA-2022-2883)	Nessus	Huawei Local Security Checks	12/27/2022	1/18/2024	high
187332	NewStart CGSL MAIN 6.06 : mokutil Multiple Vulnerabilities (NS-SA-2023-0080)	Nessus	NewStart CGSL Local Security Checks	12/27/2023	1/17/2024	high
181178	Ubuntu 20.04 LTS / 22.04 LTS : GRUB2 vulnerabilities (USN-6355-1)	Nessus	Ubuntu Local Security Checks	9/8/2023	8/27/2024	high
357773	Rocky Linux 9 [CIQ] Security Update: mokutil / mokutil-debuginfo / mokutil-debugsource / shim-aa64 / etc Multiple Vulnerabilities (crlsa-2022_5099)	Nessus	Rocky Linux Local Security Checks	10/1/2026	10/1/2026	high

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