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https://github.com/pbatard/rufus.git
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[misc] fix possible buffer overflows in _snprintf()
* _snprintf() is not always guaranteed to NUL terminate a string which could lead to buffer overflows in iso_extract_files() and iso_extract_files(). * Fix this by switching to using the more secure _snprintf_s(). * Vulnerability discovered and reported by Mansour Gashasbi (@gashasbi). * For good measure, we also switch to the strncat_s() where possible and also use memmove() instead of memcpy()/strcpy() as the behaviour of the latter on overlapping memory regions is undefined. * Also fix some additional MinGW warnings regarding casts and nb_blocks.
This commit is contained in:
Pete Batard
parent
92ac1c770c
commit
513c5f44a5
5 changed files with 27 additions and 29 deletions
31
src/iso.c
31
src/iso.c
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@ -615,10 +615,9 @@ static int udf_extract_files(udf_t *p_udf, udf_dirent_t *p_udf_dirent, const cha
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uprintf("Error allocating file name");
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goto out;
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}
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length = _snprintf(psz_fullpath, length, "%s%s/%s", psz_extract_dir, psz_path, psz_basename);
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if (length < 0) {
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length = _snprintf_s(psz_fullpath, length, _TRUNCATE, "%s%s/%s", psz_extract_dir, psz_path, psz_basename);
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if (length < 0)
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goto out;
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}
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if (S_ISLNK(udf_get_posix_filemode(p_udf_dirent)))
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img_report.has_symlinks = SYMLINKS_UDF;
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if (udf_is_dir(p_udf_dirent)) {
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@ -757,7 +756,7 @@ static int iso_extract_files(iso9660_t* p_iso, const char *psz_path)
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return 1;
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}
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length = _snprintf(psz_fullpath, sizeof(psz_fullpath), "%s%s/", psz_extract_dir, psz_path);
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length = _snprintf_s(psz_fullpath, sizeof(psz_fullpath), _TRUNCATE, "%s%s/", psz_extract_dir, psz_path);
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if (length < 0)
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goto out;
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psz_basename = &psz_fullpath[length];
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@ -1079,7 +1078,7 @@ BOOL ExtractISO(const char* src_iso, const char* dest_dir, BOOL scan)
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const char* basedir[] = { "i386", "amd64", "minint" };
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const char* tmp_sif = ".\\txtsetup.sif~";
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int k, r = 1;
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char* tmp, * buf, * ext, * spacing = " ";
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char *tmp, *buf = NULL, *ext, *spacing = " ";
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char path[MAX_PATH], path2[16];
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uint16_t sl_version;
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size_t i, j, size, sl_index = 0;
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@ -1131,7 +1130,7 @@ BOOL ExtractISO(const char* src_iso, const char* dest_dir, BOOL scan)
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if (fd_md5sum == NULL)
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uprintf("WARNING: Could not create '%s'", md5sum_name[0]);
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} else {
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md5sum_size = ReadISOFileToBuffer(src_iso, md5sum_name[0], &md5sum_data);
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md5sum_size = ReadISOFileToBuffer(src_iso, md5sum_name[0], (uint8_t**)&md5sum_data);
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md5sum_pos = md5sum_data;
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}
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}
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@ -1238,7 +1237,7 @@ out:
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char isolinux_tmp[MAX_PATH];
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static_sprintf(isolinux_tmp, "%sisolinux.tmp", temp_dir);
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size = (size_t)ExtractISOFile(src_iso, isolinux_path.String[i], isolinux_tmp, FILE_ATTRIBUTE_NORMAL);
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if ((size == 0) || (read_file(isolinux_tmp, &buf) != size)) {
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if ((size == 0) || (read_file(isolinux_tmp, (uint8_t**)&buf) != size)) {
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uprintf(" Could not access %s", isolinux_path.String[i]);
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} else {
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sl_version = GetSyslinuxVersion(buf, size, &ext);
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@ -1311,11 +1310,11 @@ out:
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// coverity[swapped_arguments]
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if (GetTempFileNameU(temp_dir, APPLICATION_NAME, 0, path) != 0) {
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size = (size_t)ExtractISOFile(src_iso, grub_path, path, FILE_ATTRIBUTE_NORMAL);
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if ((size == 0) || (read_file(path, &buf) != size))
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if ((size == 0) || (read_file(path, (uint8_t**)&buf) != size))
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uprintf(" Could not read Grub version from '%s'", grub_path);
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else
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GetGrubVersion(buf, size);
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free(buf);
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safe_free(buf);
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DeleteFileU(path);
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}
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if (img_report.grub2_version[0] == 0) {
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@ -1539,7 +1538,7 @@ uint32_t ReadISOFileToBuffer(const char* iso, const char* iso_file, uint8_t** bu
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{
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ssize_t read_size;
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int64_t file_length;
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uint32_t ret = 0, nb_blocks;
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uint32_t ret = 0, nblocks;
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iso9660_t* p_iso = NULL;
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udf_t* p_udf = NULL;
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udf_dirent_t *p_udf_root = NULL, *p_udf_file = NULL;
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@ -1566,13 +1565,13 @@ uint32_t ReadISOFileToBuffer(const char* iso, const char* iso_file, uint8_t** bu
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uprintf("Only files smaller than 4 GB are supported");
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goto out;
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}
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nb_blocks = (uint32_t)((file_length + UDF_BLOCKSIZE - 1) / UDF_BLOCKSIZE);
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*buf = malloc(nb_blocks * UDF_BLOCKSIZE + 1);
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nblocks = (uint32_t)((file_length + UDF_BLOCKSIZE - 1) / UDF_BLOCKSIZE);
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*buf = malloc(nblocks * UDF_BLOCKSIZE + 1);
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if (*buf == NULL) {
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uprintf("Could not allocate buffer for file %s", iso_file);
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goto out;
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}
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read_size = udf_read_block(p_udf_file, *buf, nb_blocks);
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read_size = udf_read_block(p_udf_file, *buf, nblocks);
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if (read_size < 0 || read_size != file_length) {
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uprintf("Error reading UDF file %s", iso_file);
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goto out;
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@ -1599,13 +1598,13 @@ try_iso:
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uprintf("Only files smaller than 4 GB are supported");
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goto out;
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}
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nb_blocks = (uint32_t)((file_length + ISO_BLOCKSIZE - 1) / ISO_BLOCKSIZE);
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*buf = malloc(nb_blocks * ISO_BLOCKSIZE + 1);
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nblocks = (uint32_t)((file_length + ISO_BLOCKSIZE - 1) / ISO_BLOCKSIZE);
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*buf = malloc(nblocks * ISO_BLOCKSIZE + 1);
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if (*buf == NULL) {
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uprintf("Could not allocate buffer for file %s", iso_file);
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goto out;
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}
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if (iso9660_iso_seek_read(p_iso, *buf, p_statbuf->lsn, nb_blocks) != nb_blocks * ISO_BLOCKSIZE) {
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if (iso9660_iso_seek_read(p_iso, *buf, p_statbuf->lsn, nblocks) != nblocks * ISO_BLOCKSIZE) {
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uprintf("Error reading ISO file %s", iso_file);
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goto out;
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}
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@ -1,7 +1,7 @@
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/*
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* Rufus: The Reliable USB Formatting Utility
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* Elementary Unicode compliant find/replace parser
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* Copyright © 2012-2023 Pete Batard <pete@akeo.ie>
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* Copyright © 2012-2024 Pete Batard <pete@akeo.ie>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -91,7 +91,7 @@ static loc_cmd* get_loc_cmd(char c, char* line) {
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// locate ending quote
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while ((line[i] != 0) && ((line[i] != '"') || ((line[i] == '"') && (line[i-1] == '\\')))) {
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if ((line[i] == '"') && (line[i-1] == '\\')) {
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strcpy(&line[i-1], &line[i]);
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memmove(&line[i-1], &line[i], strlen(&line[i]) + 1);
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} else {
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i++;
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}
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@ -3258,7 +3258,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
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static_strcpy(cur_dir, ".\\");
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} else {
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// Need to remove the '\\?\' prefix and reappend the trailing '\'
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strcpy(cur_dir, &cur_dir[4]);
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static_strcpy(cur_dir, &cur_dir[4]);
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static_strcat(cur_dir, "\\");
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}
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safe_closehandle(hFile);
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@ -3283,7 +3283,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
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static_strcpy(temp_dir, cur_dir);
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} else {
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// Need to remove the '\\?\' prefix or else we'll get issues with the Fido icon
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strcpy(temp_dir, &temp_dir[4]);
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static_strcpy(temp_dir, &temp_dir[4]);
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// And me must re-append the '\' that gets removed by GetFinalPathNameByHandle()
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static_strcat(temp_dir, "\\");
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}
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@ -150,12 +150,11 @@
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#define safe_free(p) do {free((void*)p); p = NULL;} while(0)
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#define safe_mm_free(p) do {_mm_free((void*)p); p = NULL;} while(0)
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#define safe_min(a, b) min((size_t)(a), (size_t)(b))
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#define safe_strcp(dst, dst_max, src, count) do {memcpy(dst, src, safe_min(count, dst_max)); \
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#define safe_strcp(dst, dst_max, src, count) do {memmove(dst, src, safe_min(count, dst_max)); \
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((char*)(dst))[safe_min(count, dst_max)-1] = 0;} while(0)
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#define safe_strcpy(dst, dst_max, src) safe_strcp(dst, dst_max, src, safe_strlen(src)+1)
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#define static_strcpy(dst, src) safe_strcpy(dst, sizeof(dst), src)
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#define safe_strncat(dst, dst_max, src, count) strncat(dst, src, safe_min(count, (dst_max) - safe_strlen(dst) - 1))
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#define safe_strcat(dst, dst_max, src) safe_strncat(dst, dst_max, src, safe_strlen(src)+1)
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#define safe_strcat(dst, dst_max, src) strncat_s(dst, dst_max, src, _TRUNCATE)
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#define static_strcat(dst, src) safe_strcat(dst, sizeof(dst), src)
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#define safe_strcmp(str1, str2) strcmp(((str1==NULL)?"<NULL>":str1), ((str2==NULL)?"<NULL>":str2))
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#define safe_strstr(str1, str2) strstr(((str1==NULL)?"<NULL>":str1), ((str2==NULL)?"<NULL>":str2))
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@ -164,7 +163,7 @@
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#define safe_strnicmp(str1, str2, count) _strnicmp(((str1==NULL)?"<NULL>":str1), ((str2==NULL)?"<NULL>":str2), count)
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#define safe_closehandle(h) do {if ((h != INVALID_HANDLE_VALUE) && (h != NULL)) {CloseHandle(h); h = INVALID_HANDLE_VALUE;}} while(0)
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#define safe_release_dc(hDlg, hDC) do {if ((hDC != INVALID_HANDLE_VALUE) && (hDC != NULL)) {ReleaseDC(hDlg, hDC); hDC = NULL;}} while(0)
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#define safe_sprintf(dst, count, ...) do {_snprintf(dst, count, __VA_ARGS__); (dst)[(count)-1] = 0; } while(0)
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#define safe_sprintf(dst, count, ...) do {_snprintf_s(dst, count, _TRUNCATE, __VA_ARGS__); (dst)[(count)-1] = 0; } while(0)
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#define static_sprintf(dst, ...) safe_sprintf(dst, sizeof(dst), __VA_ARGS__)
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#define safe_atoi(str) ((((char*)(str))==NULL)?0:atoi(str))
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#define safe_strlen(str) ((((char*)(str))==NULL)?0:strlen(str))
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10
src/rufus.rc
10
src/rufus.rc
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@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
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IDD_DIALOG DIALOGEX 12, 12, 232, 326
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STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
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EXSTYLE WS_EX_ACCEPTFILES
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CAPTION "Rufus 4.5.2129"
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CAPTION "Rufus 4.5.2130"
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FONT 9, "Segoe UI Symbol", 400, 0, 0x0
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BEGIN
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LTEXT "Drive Properties",IDS_DRIVE_PROPERTIES_TXT,8,6,53,12,NOT WS_GROUP
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@ -397,8 +397,8 @@ END
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//
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VS_VERSION_INFO VERSIONINFO
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FILEVERSION 4,5,2129,0
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PRODUCTVERSION 4,5,2129,0
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FILEVERSION 4,5,2130,0
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PRODUCTVERSION 4,5,2130,0
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FILEFLAGSMASK 0x3fL
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#ifdef _DEBUG
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FILEFLAGS 0x1L
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@ -416,13 +416,13 @@ BEGIN
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VALUE "Comments", "https://rufus.ie"
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VALUE "CompanyName", "Akeo Consulting"
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VALUE "FileDescription", "Rufus"
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VALUE "FileVersion", "4.5.2129"
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VALUE "FileVersion", "4.5.2130"
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VALUE "InternalName", "Rufus"
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VALUE "LegalCopyright", "<22> 2011-2024 Pete Batard (GPL v3)"
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VALUE "LegalTrademarks", "https://www.gnu.org/licenses/gpl-3.0.html"
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VALUE "OriginalFilename", "rufus-4.5.exe"
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VALUE "ProductName", "Rufus"
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VALUE "ProductVersion", "4.5.2129"
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VALUE "ProductVersion", "4.5.2130"
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END
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END
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BLOCK "VarFileInfo"
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