From: Xiangyu Chen <xiangyu.c...@windriver.com> Crafted file system images can cause heap-based buffer overflow and may allow arbitrary code execution and secure boot bypass
Reference: https://security-tracker.debian.org/tracker/CVE-2023-4692 Signed-off-by: Xiangyu Chen <xiangyu.c...@windriver.com> --- .../grub/files/CVE-2023-4692.patch | 98 +++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 99 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/CVE-2023-4692.patch diff --git a/meta/recipes-bsp/grub/files/CVE-2023-4692.patch b/meta/recipes-bsp/grub/files/CVE-2023-4692.patch new file mode 100644 index 0000000000..305fcc93d8 --- /dev/null +++ b/meta/recipes-bsp/grub/files/CVE-2023-4692.patch @@ -0,0 +1,98 @@ +From 43651027d24e62a7a463254165e1e46e42aecdea Mon Sep 17 00:00:00 2001 +From: Maxim Suhanov <dfirb...@gmail.com> +Date: Mon, 28 Aug 2023 16:31:57 +0300 +Subject: [PATCH] fs/ntfs: Fix an OOB write when parsing the $ATTRIBUTE_LIST attribute + for the $MFT file + +When parsing an extremely fragmented $MFT file, i.e., the file described +using the $ATTRIBUTE_LIST attribute, current NTFS code will reuse a buffer +containing bytes read from the underlying drive to store sector numbers, +which are consumed later to read data from these sectors into another buffer. + +These sectors numbers, two 32-bit integers, are always stored at predefined +offsets, 0x10 and 0x14, relative to first byte of the selected entry within +the $ATTRIBUTE_LIST attribute. Usually, this won't cause any problem. + +However, when parsing a specially-crafted file system image, this may cause +the NTFS code to write these integers beyond the buffer boundary, likely +causing the GRUB memory allocator to misbehave or fail. These integers contain +values which are controlled by on-disk structures of the NTFS file system. + +Such modification and resulting misbehavior may touch a memory range not +assigned to the GRUB and owned by firmware or another EFI application/driver. + +This fix introduces checks to ensure that these sector numbers are never +written beyond the boundary. + +Fixes: CVE-2023-4692 + +Upstream-Status: Backport from +[https://git.savannah.gnu.org/cgit/grub.git/commit/?id=43651027d24e62a7a463254165e1e46e42aecdea] +CVE: CVE-2023-4692 + +Reported-by: Maxim Suhanov <dfirb...@gmail.com> +Signed-off-by: Maxim Suhanov <dfirb...@gmail.com> +Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> +Signed-off-by: Xiangyu Chen <xiangyu.c...@windriver.com> +--- + grub-core/fs/ntfs.c | 18 +++++++++++++++++- + 1 file changed, 17 insertions(+), 1 deletion(-) + +diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c +index bbdbe24..c3c4db1 100644 +--- a/grub-core/fs/ntfs.c ++++ b/grub-core/fs/ntfs.c +@@ -184,7 +184,7 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) + } + if (at->attr_end) + { +- grub_uint8_t *pa; ++ grub_uint8_t *pa, *pa_end; + + at->emft_buf = grub_malloc (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR); + if (at->emft_buf == NULL) +@@ -209,11 +209,13 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) + } + at->attr_nxt = at->edat_buf; + at->attr_end = at->edat_buf + u32at (pa, 0x30); ++ pa_end = at->edat_buf + n; + } + else + { + at->attr_nxt = at->attr_end + u16at (pa, 0x14); + at->attr_end = at->attr_end + u32at (pa, 4); ++ pa_end = at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR); + } + at->flags |= GRUB_NTFS_AF_ALST; + while (at->attr_nxt < at->attr_end) +@@ -230,6 +232,13 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) + at->flags |= GRUB_NTFS_AF_GPOS; + at->attr_cur = at->attr_nxt; + pa = at->attr_cur; ++ ++ if ((pa >= pa_end) || (pa_end - pa < 0x18)) ++ { ++ grub_error (GRUB_ERR_BAD_FS, "can\'t parse attribute list"); ++ return NULL; ++ } ++ + grub_set_unaligned32 ((char *) pa + 0x10, + grub_cpu_to_le32 (at->mft->data->mft_start)); + grub_set_unaligned32 ((char *) pa + 0x14, +@@ -240,6 +249,13 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr) + { + if (*pa != attr) + break; ++ ++ if ((pa >= pa_end) || (pa_end - pa < 0x18)) ++ { ++ grub_error (GRUB_ERR_BAD_FS, "can\'t parse attribute list"); ++ return NULL; ++ } ++ + if (read_attr + (at, pa + 0x10, + u32at (pa, 0x10) * (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR), +-- +cgit v1.1 + diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index 41839698dc..5ce8699363 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -42,6 +42,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://CVE-2022-3775.patch \ file://0001-risc-v-Handle-R_RISCV_CALL_PLT-reloc.patch \ file://0001-fs-ext2-Ignore-checksum-seed-incompat-feature.patch \ + file://CVE-2023-4692.patch \ " SRC_URI[sha256sum] = "23b64b4c741569f9426ed2e3d0e6780796fca081bee4c99f62aa3f53ae803f5f" -- 2.34.1
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