Gnu Grub2 vulnerabilities

CVE-2023-4692 [HIGH] CWE-122 CVE-2023-4692: An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an att An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection by

CVE-2023-4693 [MEDIUM] CWE-125 CVE-2023-4693: An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physi An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.

CVE-2022-28734 [HIGH] CWE-787 CVE-2022-28734: Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP c 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

CVE-2022-28735 [MEDIUM] CVE-2022-28735: The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot syst 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-2022-28736 [MEDIUM] CWE-416 CVE-2022-28736: There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command i 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 allocati

CVE-2022-28733 [HIGH] CWE-191 CVE-2022-28733: Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer 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,

CVE-2022-3775 [HIGH] CWE-787 CVE-2022-3775: When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed 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 exe

CVE-2022-2601 [HIGH] CWE-122 CVE-2022-2601: A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to 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 bo

CVE-2021-3697 [HIGH] CWE-787 CVE-2021-3697: A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlle 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

CVE-2021-3695 [MEDIUM] CWE-787 CVE-2021-3695: A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker 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

CVE-2021-3696 [MEDIUM] CWE-787 CVE-2021-3696: A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This 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 arbitr

CVE-2021-46705 [MEDIUM] CWE-377 CVE-2021-46705: A Insecure Temporary File vulnerability in grub-once of grub2 in SUSE Linux Enterprise Server 15 SP4 A Insecure Temporary File vulnerability in grub-once of grub2 in SUSE Linux Enterprise Server 15 SP4, openSUSE Factory allows local attackers to truncate arbitrary files. This issue affects: SUSE Linux Enterprise Server 15 SP4 grub2 versions prior to 2.06-150400.7.1. SUSE openSUSE Factory grub2 versions prior to 2.06-18.1.

CVE-2021-3981 [LOW] CWE-276 CVE-2021-3981: A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the 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 version

CVE-2021-3418 [MEDIUM] CVE-2021-3418: If certificates that signed grub are installed into db, grub can be booted directly. It will then bo If certificates that signed grub are installed into db, grub can be booted directly. It will then boot any kernel without signature validation. The booted kernel will think it was booted in secureboot mode and will implement lockdown, yet it could have been tampered. This flaw is a reintroduction of CVE-2020-15705 and only affects grub2 versions prior to 2.06

CVE-2020-25647 [HIGH] CWE-787 CVE-2020-25647: A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors a A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The high

CVE-2020-14372 [HIGH] CWE-184 CVE-2020-14372: A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the A A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is

CVE-2021-20233 [HIGH] CWE-787 CVE-2021-20233: A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code pe A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat

CVE-2020-27779 [HIGH] CWE-285 CVE-2020-27779: A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot l A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentialit

CVE-2020-25632 [HIGH] CWE-416 CVE-2020-25632: A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading o A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vuln

CVE-2021-20225 [MEDIUM] CWE-787 CVE-2021-20225: A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write p A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.