daea2d8219
Porting patches from grub2_2.06-3~deb11u6 to fix CVE-2023-4692/CVE-2023-4693. The source code of grub2_2.06-3~deb11u6 is from: https://snapshot.debian.org/archive/debian-security/20231006T185629Z/ pool/updates/main/g/grub2/grub2_2.06-3~deb11u6.debian.tar.xz Patch for CVE-2023-4692: <fs/ntfs: Fix an OOB write when parsing the $ATTRIBUTE_LIST attribute for the $MFT file> Patch for CVE-2023-4693: <fs/ntfs: Fix an OOB read when reading data from the resident $DATA attribute> No content changes for all the patches from debian release. We do this because grub2/grub-efi is ported from wrlinux for secure boot bringing up. Test plan: - PASS: build grub2/grub-efi. - PASS: build-image and install and boot up on lab/qemu. - PASS: check that the "stx.N" version number is right for both bios(grub2 ver) and uefi(grub-efi ver) boot. Closes-bug: 2038742 Signed-off-by: Li Zhou <li.zhou@windriver.com> Change-Id: I7c8e11952fb409be93e9d777bf7da7b87414a95d
55 lines
2.2 KiB
Diff
55 lines
2.2 KiB
Diff
From: Maxim Suhanov <dfirblog@gmail.com>
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Date: Mon, 28 Aug 2023 16:32:33 +0300
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Subject: fs/ntfs: Fix an OOB read when reading data from the resident $DATA
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attribute
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When reading a file containing resident data, i.e., the file data is stored in
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the $DATA attribute within the NTFS file record, not in external clusters,
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there are no checks that this resident data actually fits the corresponding
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file record segment.
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When parsing a specially-crafted file system image, the current NTFS code will
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read the file data from an arbitrary, attacker-chosen memory offset and of
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arbitrary, attacker-chosen length.
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This allows an attacker to display arbitrary chunks of memory, which could
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contain sensitive information like password hashes or even plain-text,
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obfuscated passwords from BS EFI variables.
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This fix implements a check to ensure that resident data is read from the
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corresponding file record segment only.
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Fixes: CVE-2023-4693
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Reported-by: Maxim Suhanov <dfirblog@gmail.com>
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Signed-off-by: Maxim Suhanov <dfirblog@gmail.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/fs/ntfs.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c
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index c3c4db1..a68e173 100644
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--- a/grub-core/fs/ntfs.c
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+++ b/grub-core/fs/ntfs.c
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@@ -401,7 +401,18 @@ read_data (struct grub_ntfs_attr *at, grub_uint8_t *pa, grub_uint8_t *dest,
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{
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if (ofs + len > u32at (pa, 0x10))
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return grub_error (GRUB_ERR_BAD_FS, "read out of range");
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- grub_memcpy (dest, pa + u32at (pa, 0x14) + ofs, len);
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+
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+ if (u32at (pa, 0x10) > (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR))
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+ return grub_error (GRUB_ERR_BAD_FS, "resident attribute too large");
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+
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+ if (pa >= at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR))
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+ return grub_error (GRUB_ERR_BAD_FS, "resident attribute out of range");
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+
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+ if (u16at (pa, 0x14) + u32at (pa, 0x10) >
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+ (grub_addr_t) at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR) - (grub_addr_t) pa)
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+ return grub_error (GRUB_ERR_BAD_FS, "resident attribute out of range");
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+
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+ grub_memcpy (dest, pa + u16at (pa, 0x14) + ofs, len);
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return 0;
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}
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