97 lines
4.9 KiB
JSON
97 lines
4.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-16671",
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"assignerOrgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
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"state": "PUBLISHED",
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"assignerShortName": "zephyr",
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"dateReserved": "2026-07-22T19:48:03.071Z",
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"datePublished": "2026-11-13T00:23:02.120Z",
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"dateUpdated": "2026-11-13T00:23:02.120Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "e2e69745-5e70-4e92-8431-deb5529a81ad",
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"shortName": "zephyr",
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"dateUpdated": "2026-11-13T00:23:02.120Z"
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},
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"title": "Out-of-bounds stack write in MCUboot split-image validation with SHA-384/SHA-512 builds",
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"descriptions": [
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{
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"lang": "en",
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"value": "split_image_check() in boot/bootutil/src/loader.c declares a fixed uint8_t loader_hash[32] buffer and passes it as the out_hash out-parameter to bootutil_img_validate(). That routine copies IMAGE_HASH_SIZE bytes into out_hash (memcpy(out_hash, hash, IMAGE_HASH_SIZE) in boot/bootutil/src/image_validate.c), where IMAGE_HASH_SIZE is a compile-time constant of 64 for MCUBOOT_SHA512 or 48 for MCUBOOT_SIGN_EC384/SHA-384 (boot/bootutil/include/bootutil/crypto/sha.h). The buffer tracks SHA-256 (32 bytes) while the copy length tracks the configured algorithm, so the write overruns the buffer by 16 or 32 bytes.\n\nThe overflow is only present in a non-default configuration: the legacy Mynewt split-image feature must be compiled (split_go()/split_image_check(), i.e. neither MCUBOOT_DIRECT_XIP nor MCUBOOT_RAM_LOAD), the digest must be larger than 32 bytes (MCUBOOT_SHA512 or MCUBOOT_SIGN_EC384), and MCUBOOT_SIGN_PURE must be off. split_go() is a public API with no caller inside MCUboot; it is invoked from a Mynewt application. In the default SHA-256 build there is no overflow.\n\nThe over-written bytes are the one-way digest of the loader image and the overflow length is fixed at build time, so the contents are not meaningfully attacker-controlled and the size is not attacker-chosen. The realistic impact is bounded, uncontrolled corruption of the bootloader's stack on the split-boot path, manifesting as instability or failed boot in the affected configuration rather than reliable code execution. The fix is to size loader_hash to IMAGE_HASH_SIZE and pass IMAGE_HASH_SIZE as the matching seed length."
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}
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],
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"affected": [
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{
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"vendor": "mcu-tools",
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"product": "mcuboot",
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"collectionURL": "https://github.com/mcu-tools/mcuboot",
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"packageName": "mcuboot",
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"defaultStatus": "unaffected",
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"programFiles": [
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"boot/bootutil/src/image_validate.c",
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"boot/bootutil/src/loader.c"
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],
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"programRoutines": [
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{
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"name": "split_go"
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},
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{
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"name": "split_image_check"
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}
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],
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"versions": [
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{
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"version": "2.0.0",
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"status": "affected",
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"versionType": "semver",
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"lessThan": "2.5.0"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://github.com/mcu-tools/mcuboot/commit/9fb70f00173766d73cdadd82266bd61e4ddd0252",
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"name": "Fix commit",
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"tags": [
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"patch"
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]
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},
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{
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"url": "https://github.com/mcu-tools/mcuboot/security/advisories/GHSA-vj6q-r752-fpqv",
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"name": "GHSA-vj6q-r752-fpqv"
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
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"baseScore": 2.9,
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"baseSeverity": "LOW"
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"description": "memory-safety",
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"cweId": "CWE-787",
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"type": "CWE"
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}
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]
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}
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],
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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}
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}
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} |