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home:dirkmueller:acdc:as_python3_module
freerdp
freerdp-CVE-2022-39347.patch
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File freerdp-CVE-2022-39347.patch of Package freerdp
From af969250d4092df9dcb47f313b4d1ed56dbcf7a6 Mon Sep 17 00:00:00 2001 From: akallabeth <akallabeth@posteo.net> Date: Mon, 24 Oct 2022 10:42:56 +0200 Subject: [PATCH 1/4] Added function _wcsncmp * Compare WCHAR strings up to n characters (cherry picked from commit 8178ed26a459356ece17414c6e871a7e0735a4ec) --- winpr/include/winpr/string.h | 2 ++ winpr/libwinpr/crt/string.c | 15 ++++++++++++++- 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/winpr/include/winpr/string.h b/winpr/include/winpr/string.h index 8ce83bc1d..3b907c444 100644 --- a/winpr/include/winpr/string.h +++ b/winpr/include/winpr/string.h @@ -57,6 +57,7 @@ extern "C" WINPR_API int _strnicmp(const char* string1, const char* string2, size_t count); WINPR_API int _wcscmp(const WCHAR* string1, const WCHAR* string2); + WINPR_API int _wcsncmp(const WCHAR* string1, const WCHAR* string2, size_t count); WINPR_API size_t _wcslen(const WCHAR* str); WINPR_API size_t _wcsnlen(const WCHAR* str, size_t maxNumberOfElements); @@ -70,6 +71,7 @@ extern "C" #else #define _wcscmp wcscmp +#define _wcsncmp wcsncmp #define _wcslen wcslen #define _wcsnlen wcsnlen #define _wcschr wcschr diff --git a/winpr/libwinpr/crt/string.c b/winpr/libwinpr/crt/string.c index 37fcb4b25..c25ffa279 100644 --- a/winpr/libwinpr/crt/string.c +++ b/winpr/libwinpr/crt/string.c @@ -90,7 +90,20 @@ int _wcscmp(const WCHAR* string1, const WCHAR* string2) Data_Read_UINT16(string1, value1); Data_Read_UINT16(string2, value2); - return value1 - value2; + return (int)value1 - value2; +} + +int _wcsncmp(const WCHAR* string1, const WCHAR* string2, size_t count) +{ + for (size_t x = 0; x < count; x++) + { + const WCHAR a = string1[x]; + const WCHAR b = string2[x]; + + if (a != b) + return (int)a - b; + } + return 0; } /* _wcslen -> wcslen */ -- 2.39.1 From f9959ee34eb6ba5feb88556887514e5a6805b1a9 Mon Sep 17 00:00:00 2001 From: akallabeth <akallabeth@posteo.net> Date: Thu, 10 Nov 2022 14:21:22 +0100 Subject: [PATCH 2/4] [winpr, crt] Fix wcs*cmp and wcs*len checks (cherry picked from commit b60fac1a0470fe83e8d0b448f0fd7e9e6d6a0f96) --- winpr/libwinpr/crt/string.c | 30 +++++++++++++++++++----------- 1 file changed, 19 insertions(+), 11 deletions(-) diff --git a/winpr/libwinpr/crt/string.c b/winpr/libwinpr/crt/string.c index c25ffa279..5dcf4b3f1 100644 --- a/winpr/libwinpr/crt/string.c +++ b/winpr/libwinpr/crt/string.c @@ -26,6 +26,7 @@ #include <wctype.h> #include <winpr/crt.h> +#include <winpr/assert.h> #include <winpr/endian.h> /* String Manipulation (CRT): http://msdn.microsoft.com/en-us/library/f0151s4x.aspx */ @@ -80,21 +81,28 @@ int _strnicmp(const char* string1, const char* string2, size_t count) int _wcscmp(const WCHAR* string1, const WCHAR* string2) { - WCHAR value1, value2; + WINPR_ASSERT(string1); + WINPR_ASSERT(string2); - while (*string1 && (*string1 == *string2)) + while (TRUE) { - string1++; - string2++; + const WCHAR w1 = *string1++; + const WCHAR w2 = *string2++; + + if (w1 != w2) + return (int)w1 - w2; + else if ((w1 == '\0') || (w2 == '\0')) + return (int)w1 - w2; } - Data_Read_UINT16(string1, value1); - Data_Read_UINT16(string2, value2); - return (int)value1 - value2; + return 0; } int _wcsncmp(const WCHAR* string1, const WCHAR* string2, size_t count) { + WINPR_ASSERT(string1); + WINPR_ASSERT(string2); + for (size_t x = 0; x < count; x++) { const WCHAR a = string1[x]; @@ -102,6 +110,8 @@ int _wcsncmp(const WCHAR* string1, const WCHAR* string2, size_t count) if (a != b) return (int)a - b; + else if ((a == '\0') || (b == '\0')) + return (int)a - b; } return 0; } @@ -112,8 +122,7 @@ size_t _wcslen(const WCHAR* str) { const WCHAR* p = (const WCHAR*)str; - if (!p) - return 0; + WINPR_ASSERT(p); while (*p) p++; @@ -127,8 +136,7 @@ size_t _wcsnlen(const WCHAR* str, size_t max) { size_t x; - if (!str) - return 0; + WINPR_ASSERT(str); for (x = 0; x < max; x++) { -- 2.39.1 From 46adadb58cf045ca22dee2f59cd027765c53c801 Mon Sep 17 00:00:00 2001 From: akallabeth <akallabeth@posteo.net> Date: Thu, 10 Nov 2022 15:54:28 +0100 Subject: [PATCH 3/4] [winpr, crt] Added wcsstr implementation (cherry picked from commit 6c034ba6117a4efc9266e845fe9a9a92ed4ee61d) --- winpr/include/winpr/string.h | 3 +++ winpr/libwinpr/crt/string.c | 20 ++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/winpr/include/winpr/string.h b/winpr/include/winpr/string.h index 3b907c444..2d7126210 100644 --- a/winpr/include/winpr/string.h +++ b/winpr/include/winpr/string.h @@ -62,6 +62,8 @@ extern "C" WINPR_API size_t _wcslen(const WCHAR* str); WINPR_API size_t _wcsnlen(const WCHAR* str, size_t maxNumberOfElements); + WINPR_API WCHAR* _wcsstr(const WCHAR* str, const WCHAR* strSearch); + WINPR_API WCHAR* _wcschr(const WCHAR* str, WCHAR c); WINPR_API WCHAR* _wcsrchr(const WCHAR* str, WCHAR c); @@ -74,6 +76,7 @@ extern "C" #define _wcsncmp wcsncmp #define _wcslen wcslen #define _wcsnlen wcsnlen +#define _wcsstr wcsstr #define _wcschr wcschr #define _wcsrchr wcsrchr diff --git a/winpr/libwinpr/crt/string.c b/winpr/libwinpr/crt/string.c index 5dcf4b3f1..efd7d166c 100644 --- a/winpr/libwinpr/crt/string.c +++ b/winpr/libwinpr/crt/string.c @@ -147,6 +147,26 @@ size_t _wcsnlen(const WCHAR* str, size_t max) return x; } +/* _wcsstr -> wcsstr */ + +WCHAR* _wcsstr(const WCHAR* str, const WCHAR* strSearch) +{ + WINPR_ASSERT(str); + WINPR_ASSERT(strSearch); + + if (strSearch[0] == '\0') + return str; + + const size_t searchLen = _wcslen(strSearch); + while (*str) + { + if (_wcsncmp(str, strSearch, searchLen) == 0) + return str; + str++; + } + return NULL; +} + /* _wcschr -> wcschr */ WCHAR* _wcschr(const WCHAR* str, WCHAR c) -- 2.39.1 From a831d3eeb85bf5a667f483da7c78aa19a9e55229 Mon Sep 17 00:00:00 2001 From: akallabeth <akallabeth@posteo.net> Date: Mon, 24 Oct 2022 10:41:55 +0200 Subject: [PATCH 4/4] Fixed path validation in drive channel Check that canonical path is a subpath of the shared directory (cherry picked from commit 844c94e6d0438fa7bd8ff8d5513c3f69c3018b85) --- channels/drive/client/drive_file.c | 107 ++++++++++++++++++----------- channels/drive/client/drive_file.h | 8 +-- channels/drive/client/drive_main.c | 8 +-- 3 files changed, 74 insertions(+), 49 deletions(-) diff --git a/channels/drive/client/drive_file.c b/channels/drive/client/drive_file.c index 305438593..cf5785f9e 100644 --- a/channels/drive/client/drive_file.c +++ b/channels/drive/client/drive_file.c @@ -35,6 +35,7 @@ #include <string.h> #include <time.h> +#include <winpr/assert.h> #include <winpr/wtypes.h> #include <winpr/crt.h> #include <winpr/path.h> @@ -61,10 +62,14 @@ } while (0) #endif -static void drive_file_fix_path(WCHAR* path) +static BOOL drive_file_fix_path(WCHAR* path, size_t length) { size_t i; - size_t length = _wcslen(path); + + if ((length == 0) || (length > UINT32_MAX)) + return FALSE; + + WINPR_ASSERT(path); for (i = 0; i < length; i++) { @@ -75,58 +80,82 @@ static void drive_file_fix_path(WCHAR* path) #ifdef WIN32 if ((length == 3) && (path[1] == L':') && (path[2] == L'/')) - return; + return FALSE; #else if ((length == 1) && (path[0] == L'/')) - return; + return FALSE; #endif if ((length > 0) && (path[length - 1] == L'/')) path[length - 1] = L'\0'; + + return TRUE; } static WCHAR* drive_file_combine_fullpath(const WCHAR* base_path, const WCHAR* path, - size_t PathLength) + size_t PathWCharLength) { - WCHAR* fullpath; - size_t base_path_length; + BOOL ok = FALSE; + WCHAR* fullpath = NULL; + size_t length; - if (!base_path || (!path && (PathLength > 0))) - return NULL; + if (!base_path || (!path && (PathWCharLength > 0))) + goto fail; - base_path_length = _wcslen(base_path) * 2; - fullpath = (WCHAR*)calloc(1, base_path_length + PathLength + sizeof(WCHAR)); + const size_t base_path_length = _wcsnlen(base_path, MAX_PATH); + length = base_path_length + PathWCharLength + 1; + fullpath = (WCHAR*)calloc(length, sizeof(WCHAR)); if (!fullpath) + goto fail; + + CopyMemory(fullpath, base_path, base_path_length * sizeof(WCHAR)); + if (path) + CopyMemory(&fullpath[base_path_length], path, PathWCharLength * sizeof(WCHAR)); + + if (!drive_file_fix_path(fullpath, length)) + goto fail; + + /* Ensure the path does not contain sequences like '..' */ + const WCHAR dotdot[] = { '.', '.', '\0' }; + if (_wcsstr(&fullpath[base_path_length], dotdot)) { - WLog_ERR(TAG, "malloc failed!"); - return NULL; + char abuffer[MAX_PATH] = { 0 }; + ConvertFromUnicode(CP_UTF8, 0, &fullpath[base_path_length], -1, (char**)&abuffer, + ARRAYSIZE(abuffer) - 1, NULL, NULL); + + WLog_WARN(TAG, "[rdpdr] received invalid file path '%s' from server, aborting!", + &abuffer[base_path_length]); + goto fail; } - CopyMemory(fullpath, base_path, base_path_length); - if (path) - CopyMemory((char*)fullpath + base_path_length, path, PathLength); - drive_file_fix_path(fullpath); + ok = TRUE; +fail: + if (!ok) + { + free(fullpath); + fullpath = NULL; + } return fullpath; } static BOOL drive_file_remove_dir(const WCHAR* path) { - WIN32_FIND_DATAW findFileData; + WIN32_FIND_DATAW findFileData = { 0 }; BOOL ret = TRUE; - HANDLE dir; - WCHAR* fullpath; - WCHAR* path_slash; - size_t base_path_length; + HANDLE dir = INVALID_HANDLE_VALUE; + WCHAR* fullpath = NULL; + WCHAR* path_slash = NULL; + size_t base_path_length = 0; if (!path) return FALSE; - base_path_length = _wcslen(path) * 2; - path_slash = (WCHAR*)calloc(1, base_path_length + sizeof(WCHAR) * 3); + base_path_length = _wcslen(path); + path_slash = (WCHAR*)calloc(base_path_length + 3, sizeof(WCHAR)); if (!path_slash) { @@ -134,12 +163,11 @@ static BOOL drive_file_remove_dir(const WCHAR* path) return FALSE; } - CopyMemory(path_slash, path, base_path_length); - path_slash[base_path_length / 2] = L'/'; - path_slash[base_path_length / 2 + 1] = L'*'; + CopyMemory(path_slash, path, base_path_length * sizeof(WCHAR)); + path_slash[base_path_length] = L'/'; + path_slash[base_path_length + 1] = L'*'; DEBUG_WSTR("Search in %s", path_slash); dir = FindFirstFileW(path_slash, &findFileData); - path_slash[base_path_length / 2 + 1] = 0; if (dir == INVALID_HANDLE_VALUE) { @@ -149,7 +177,7 @@ static BOOL drive_file_remove_dir(const WCHAR* path) do { - size_t len = _wcslen(findFileData.cFileName); + const size_t len = _wcsnlen(findFileData.cFileName, ARRAYSIZE(findFileData.cFileName)); if ((len == 1 && findFileData.cFileName[0] == L'.') || (len == 2 && findFileData.cFileName[0] == L'.' && findFileData.cFileName[1] == L'.')) @@ -157,7 +185,7 @@ static BOOL drive_file_remove_dir(const WCHAR* path) continue; } - fullpath = drive_file_combine_fullpath(path_slash, findFileData.cFileName, len * 2); + fullpath = drive_file_combine_fullpath(path_slash, findFileData.cFileName, len); DEBUG_WSTR("Delete %s", fullpath); if (findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) @@ -333,13 +361,13 @@ static BOOL drive_file_init(DRIVE_FILE* file) return file->file_handle != INVALID_HANDLE_VALUE; } -DRIVE_FILE* drive_file_new(const WCHAR* base_path, const WCHAR* path, UINT32 PathLength, UINT32 id, - UINT32 DesiredAccess, UINT32 CreateDisposition, UINT32 CreateOptions, - UINT32 FileAttributes, UINT32 SharedAccess) +DRIVE_FILE* drive_file_new(const WCHAR* base_path, const WCHAR* path, UINT32 PathWCharLength, + UINT32 id, UINT32 DesiredAccess, UINT32 CreateDisposition, + UINT32 CreateOptions, UINT32 FileAttributes, UINT32 SharedAccess) { DRIVE_FILE* file; - if (!base_path || (!path && (PathLength > 0))) + if (!base_path || (!path && (PathWCharLength > 0))) return NULL; file = (DRIVE_FILE*)calloc(1, sizeof(DRIVE_FILE)); @@ -359,7 +387,7 @@ DRIVE_FILE* drive_file_new(const WCHAR* base_path, const WCHAR* path, UINT32 Pat file->CreateDisposition = CreateDisposition; file->CreateOptions = CreateOptions; file->SharedAccess = SharedAccess; - drive_file_set_fullpath(file, drive_file_combine_fullpath(base_path, path, PathLength)); + drive_file_set_fullpath(file, drive_file_combine_fullpath(base_path, path, PathWCharLength)); if (!drive_file_init(file)) { @@ -714,13 +742,10 @@ BOOL drive_file_set_information(DRIVE_FILE* file, UINT32 FsInformationClass, UIN return FALSE; fullpath = drive_file_combine_fullpath(file->basepath, (WCHAR*)Stream_Pointer(input), - FileNameLength); + FileNameLength / sizeof(WCHAR)); if (!fullpath) - { - WLog_ERR(TAG, "drive_file_combine_fullpath failed!"); return FALSE; - } #ifdef _WIN32 @@ -759,7 +784,7 @@ BOOL drive_file_set_information(DRIVE_FILE* file, UINT32 FsInformationClass, UIN } BOOL drive_file_query_directory(DRIVE_FILE* file, UINT32 FsInformationClass, BYTE InitialQuery, - const WCHAR* path, UINT32 PathLength, wStream* output) + const WCHAR* path, UINT32 PathWCharLength, wStream* output) { size_t length; WCHAR* ent_path; @@ -773,7 +798,7 @@ BOOL drive_file_query_directory(DRIVE_FILE* file, UINT32 FsInformationClass, BYT if (file->find_handle != INVALID_HANDLE_VALUE) FindClose(file->find_handle); - ent_path = drive_file_combine_fullpath(file->basepath, path, PathLength); + ent_path = drive_file_combine_fullpath(file->basepath, path, PathWCharLength); /* open new search handle and retrieve the first entry */ file->find_handle = FindFirstFileW(ent_path, &file->find_data); free(ent_path); diff --git a/channels/drive/client/drive_file.h b/channels/drive/client/drive_file.h index ed789d6f0..6d3bd7045 100644 --- a/channels/drive/client/drive_file.h +++ b/channels/drive/client/drive_file.h @@ -51,9 +51,9 @@ struct _DRIVE_FILE UINT32 CreateOptions; }; -DRIVE_FILE* drive_file_new(const WCHAR* base_path, const WCHAR* path, UINT32 PathLength, UINT32 id, - UINT32 DesiredAccess, UINT32 CreateDisposition, UINT32 CreateOptions, - UINT32 FileAttributes, UINT32 SharedAccess); +DRIVE_FILE* drive_file_new(const WCHAR* base_path, const WCHAR* path, UINT32 PathWCharLength, + UINT32 id, UINT32 DesiredAccess, UINT32 CreateDisposition, + UINT32 CreateOptions, UINT32 FileAttributes, UINT32 SharedAccess); BOOL drive_file_free(DRIVE_FILE* file); BOOL drive_file_open(DRIVE_FILE* file); @@ -64,6 +64,6 @@ BOOL drive_file_query_information(DRIVE_FILE* file, UINT32 FsInformationClass, w BOOL drive_file_set_information(DRIVE_FILE* file, UINT32 FsInformationClass, UINT32 Length, wStream* input); BOOL drive_file_query_directory(DRIVE_FILE* file, UINT32 FsInformationClass, BYTE InitialQuery, - const WCHAR* path, UINT32 PathLength, wStream* output); + const WCHAR* path, UINT32 PathWCharLength, wStream* output); #endif /* FREERDP_CHANNEL_DRIVE_FILE_H */ diff --git a/channels/drive/client/drive_main.c b/channels/drive/client/drive_main.c index 1b5422522..d3776381c 100644 --- a/channels/drive/client/drive_main.c +++ b/channels/drive/client/drive_main.c @@ -184,8 +184,8 @@ static UINT drive_process_irp_create(DRIVE_DEVICE* drive, IRP* irp) path = (const WCHAR*)Stream_Pointer(irp->input); FileId = irp->devman->id_sequence++; - file = drive_file_new(drive->path, path, PathLength, FileId, DesiredAccess, CreateDisposition, - CreateOptions, FileAttributes, SharedAccess); + file = drive_file_new(drive->path, path, PathLength / sizeof(WCHAR), FileId, DesiredAccess, + CreateDisposition, CreateOptions, FileAttributes, SharedAccess); if (!file) { @@ -636,8 +636,8 @@ static UINT drive_process_irp_query_directory(DRIVE_DEVICE* drive, IRP* irp) irp->IoStatus = STATUS_UNSUCCESSFUL; Stream_Write_UINT32(irp->output, 0); /* Length */ } - else if (!drive_file_query_directory(file, FsInformationClass, InitialQuery, path, PathLength, - irp->output)) + else if (!drive_file_query_directory(file, FsInformationClass, InitialQuery, path, + PathLength / sizeof(WCHAR), irp->output)) { irp->IoStatus = drive_map_windows_err(GetLastError()); } -- 2.39.1
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