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Fixed CVE-2020-11522: Limit number of DELTA_RECT to 45.

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Thanks to Sunglin and HuanGMz from Knownsec 404
This commit is contained in:
akallabeth 2020-03-30 18:14:18 +02:00 committed by akallabeth
parent 7b1d4b4939
commit 907640a924
1 changed files with 11 additions and 7 deletions
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18
libfreerdp/core/orders.c
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@ -846,15 +846,19 @@ static INLINE BOOL update_write_brush(wStream* s, rdpBrush* brush, BYTE fieldFla
return TRUE;
}
static INLINE BOOL update_read_delta_rects(wStream* s, DELTA_RECT* rectangles, UINT32 number)
static INLINE BOOL update_read_delta_rects(wStream* s, DELTA_RECT* rectangles, UINT32* nr)
{
UINT32 number = *nr;
UINT32 i;
BYTE flags = 0;
BYTE* zeroBits;
UINT32 zeroBitsSize;
if (number > 45)
number = 45;
{
WLog_WARN(TAG, "Invalid number of delta rectangles %" PRIu32, number);
return FALSE;
}
zeroBitsSize = ((number + 1) / 2);
@ -1248,7 +1252,7 @@ static BOOL update_read_multi_dstblt_order(wStream* s, const ORDER_INFO* orderIn
return FALSE;
Stream_Read_UINT16(s, multi_dstblt->cbData);
return update_read_delta_rects(s, multi_dstblt->rectangles, multi_dstblt->numRectangles);
return update_read_delta_rects(s, multi_dstblt->rectangles, &multi_dstblt->numRectangles);
}
return TRUE;
@ -1276,7 +1280,7 @@ static BOOL update_read_multi_patblt_order(wStream* s, const ORDER_INFO* orderIn
Stream_Read_UINT16(s, multi_patblt->cbData);
if (!update_read_delta_rects(s, multi_patblt->rectangles, multi_patblt->numRectangles))
if (!update_read_delta_rects(s, multi_patblt->rectangles, &multi_patblt->numRectangles))
return FALSE;
}
@ -1300,7 +1304,7 @@ static BOOL update_read_multi_scrblt_order(wStream* s, const ORDER_INFO* orderIn
return FALSE;
Stream_Read_UINT16(s, multi_scrblt->cbData);
return update_read_delta_rects(s, multi_scrblt->rectangles, multi_scrblt->numRectangles);
return update_read_delta_rects(s, multi_scrblt->rectangles, &multi_scrblt->numRectangles);
}
return TRUE;
@ -1350,7 +1354,7 @@ static BOOL update_read_multi_opaque_rect_order(wStream* s, const ORDER_INFO* or
Stream_Read_UINT16(s, multi_opaque_rect->cbData);
return update_read_delta_rects(s, multi_opaque_rect->rectangles,
multi_opaque_rect->numRectangles);
&multi_opaque_rect->numRectangles);
}
return TRUE;
@ -1372,7 +1376,7 @@ static BOOL update_read_multi_draw_nine_grid_order(wStream* s, const ORDER_INFO*
Stream_Read_UINT16(s, multi_draw_nine_grid->cbData);
return update_read_delta_rects(s, multi_draw_nine_grid->rectangles,
multi_draw_nine_grid->nDeltaEntries);
&multi_draw_nine_grid->nDeltaEntries);
}
return TRUE;