File freerdp-CVE-2021-41160.patch of Package freerdp.26463

Overview Repositories Revisions Requests Users Attributes Meta

File freerdp-CVE-2021-41160.patch of Package freerdp.26463

From be3dc441ceb4371a384c509c74197b4df593b8be Mon Sep 17 00:00:00 2001
From: Armin Novak <armin.novak@thincast.com>
Date: Mon, 11 Oct 2021 16:04:29 +0200
Subject: [PATCH] Added checks for glyph width & height

From 1559cb34f7231d6733611b3c22c5bcb3bdaaeb72 Mon Sep 17 00:00:00 2001
From: Armin Novak <armin.novak@thincast.com>
Date: Mon, 11 Oct 2021 09:19:21 +0200
Subject: [PATCH] Added checks for bitmap width and heigth values

---
 libfreerdp/core/orders.c | 7 +++++++
 1 file changed, 7 insertions(+)

Index: FreeRDP-2.1.2/libfreerdp/core/orders.c
===================================================================
--- FreeRDP-2.1.2.orig/libfreerdp/core/orders.c
+++ FreeRDP-2.1.2/libfreerdp/core/orders.c
@@ -1832,6 +1832,13 @@ static BOOL update_read_fast_glyph_order
 			    !update_read_2byte_unsigned(s, &glyph->cy))
 				return FALSE;
 
+			if ((glyph->cx == 0) || (glyph->cy == 0))
+            {
+                    WLog_ERR(TAG, "GLYPH_DATA_V2::cx=%" PRIu32 ", GLYPH_DATA_V2::cy=%" PRIu32,
+                             glyph->cx, glyph->cy);
+                    return FALSE;
+            }
+
 			glyph->cb = ((glyph->cx + 7) / 8) * glyph->cy;
 			glyph->cb += ((glyph->cb % 4) > 0) ? 4 - (glyph->cb % 4) : 0;
 			new_cb = ((glyph->cx + 7) / 8) * glyph->cy;
@@ -2815,6 +2822,13 @@ update_read_create_offscreen_bitmap_orde
 	Stream_Read_UINT16(s, create_offscreen_bitmap->cy); /* cy (2 bytes) */
 	deleteList = &(create_offscreen_bitmap->deleteList);
 
+	if ((create_offscreen_bitmap->cx == 0) || (create_offscreen_bitmap->cy == 0))
+	{
+		WLog_ERR(TAG, "Invalid OFFSCREEN_DELETE_LIST: cx=%" PRIu16 ", cy=%" PRIu16,
+		         create_offscreen_bitmap->cx, create_offscreen_bitmap->cy);
+		return FALSE;
+	}
+
 	if (deleteListPresent)
 	{
 		UINT32 i;
Index: FreeRDP-2.1.2/libfreerdp/core/surface.c
===================================================================
--- FreeRDP-2.1.2.orig/libfreerdp/core/surface.c
+++ FreeRDP-2.1.2/libfreerdp/core/surface.c
@@ -21,6 +21,8 @@
 #include "config.h"
 #endif
 
+#include <winpr/assert.h>
+
 #include <freerdp/utils/pcap.h>
 #include <freerdp/log.h>
 
@@ -62,6 +64,13 @@ static BOOL update_recv_surfcmd_bitmap_e
 	Stream_Read_UINT16(s, bmp->height);
 	Stream_Read_UINT32(s, bmp->bitmapDataLength);
 
+	if ((bmp->width == 0) || (bmp->height == 0))
+	{
+		WLog_ERR(TAG, "invalid size value width=%" PRIu16 ", height=%" PRIu16, bmp->width,
+		         bmp->height);
+		return FALSE;
+	}
+
 	if ((bmp->bpp < 1) || (bmp->bpp > 32))
 	{
 		WLog_ERR(TAG, "invalid bpp value %" PRIu32 "", bmp->bpp);
@@ -85,6 +94,39 @@ static BOOL update_recv_surfcmd_bitmap_e
 	return TRUE;
 }
 
+static BOOL update_recv_surfcmd_is_rect_valid(const rdpContext* context,
+                                              const SURFACE_BITS_COMMAND* cmd)
+{
+	WINPR_ASSERT(context);
+	WINPR_ASSERT(context->settings);
+	WINPR_ASSERT(cmd);
+
+	/* We need a rectangle with left/top being smaller than right/bottom.
+	 * Also do not allow empty rectangles. */
+	if ((cmd->destTop >= cmd->destBottom) || (cmd->destLeft >= cmd->destRight))
+	{
+		WLog_WARN(TAG,
+		          "Empty surface bits command rectangle: %" PRIu16 "x%" PRIu16 "-%" PRIu16
+		          "x%" PRIu16,
+		          cmd->destLeft, cmd->destTop, cmd->destRight, cmd->destBottom);
+		return FALSE;
+	}
+
+	/* The rectangle needs to fit into our session size */
+	if ((cmd->destRight > context->settings->DesktopWidth) ||
+	    (cmd->destBottom > context->settings->DesktopHeight))
+	{
+		WLog_WARN(TAG,
+		          "Invalid surface bits command rectangle: %" PRIu16 "x%" PRIu16 "-%" PRIu16
+		          "x%" PRIu16 " does not fit %" PRIu32 "x%" PRIu32,
+		          cmd->destLeft, cmd->destTop, cmd->destRight, cmd->destBottom,
+		          context->settings->DesktopWidth, context->settings->DesktopHeight);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
 static BOOL update_recv_surfcmd_surface_bits(rdpUpdate* update, wStream* s, UINT16 cmdType)
 {
 	SURFACE_BITS_COMMAND cmd = { 0 };
@@ -98,6 +140,9 @@ static BOOL update_recv_surfcmd_surface_
 	Stream_Read_UINT16(s, cmd.destRight);
 	Stream_Read_UINT16(s, cmd.destBottom);
 
+	if (!update_recv_surfcmd_is_rect_valid(update->context, &cmd))
+		goto fail;
+
 	if (!update_recv_surfcmd_bitmap_ex(s, &cmd.bmp))
 		goto fail;
 
Index: FreeRDP-2.1.2/libfreerdp/core/update.c
===================================================================
--- FreeRDP-2.1.2.orig/libfreerdp/core/update.c
+++ FreeRDP-2.1.2/libfreerdp/core/update.c
@@ -99,6 +99,13 @@ static BOOL update_read_bitmap_data(rdpU
 	Stream_Read_UINT16(s, bitmapData->flags);
 	Stream_Read_UINT16(s, bitmapData->bitmapLength);
 
+	if ((bitmapData->width == 0) || (bitmapData->height == 0))
+	{
+		WLog_ERR(TAG, "Invalid BITMAP_DATA: width=%" PRIu16 ", height=%" PRIu16, bitmapData->width,
+		         bitmapData->height);
+		return FALSE;
+	}
+
 	if (bitmapData->flags & BITMAP_COMPRESSION)
 	{
 		if (!(bitmapData->flags & NO_BITMAP_COMPRESSION_HDR))

Places

File freerdp-CVE-2021-41160.patch of Package freerdp.26463

Places